第一章 Java 语言入门
简单、面向对象、稳定、与平台无关、解释型、多线程、动态等特点。
Java程序的开发过程：
源文件→Java编译器→字节码文件（由解释器执行）→对于Java小应用程序→由Web浏览器执行
其中字节码文件是与平台无关的二进制码，执行时解释成本地机器码。
(Java编译器javac.exe和解释器java.exe)
Java程序分为两类：Java小程序和Java程序
例：
public class Hello
{
public static void main (String args[ ])
{
System.out.println("hello， Java !");
}
}
一个Java源程序由若干个类组成，其中public static void main (String args[ ])是类中一个方法，此为应用程序的主类。main方法必须被说明为public static void 。
String args[ ]声明一个字符串类型的数组args[ ]，main方法是程序开始执行的位置。一般来说，源文件的名字与其中的public类名相同。
public class People //People.java
{
float hight,weight;
String head, ear, mouth;
void speak(String s) //普通成员函数
{
System.out.println(s);
}
}
class A
{ public static void main(String args[])
{People zhubajie;
zhubajie=new People();
zhubajie.weight=200f;
zhubajie.hight=1.70F;
zhubajie.head=“大头”;
zhubajie.ear="两只大耳朵";
zhubajie.mouth="一只大嘴";
System.out.println("重量"+zhubajie.weight+"身高" +zhubajie.hight);
System.out.println(zhubajie.head+zhubajie.mouth+zhubajie.ear);
zhubajie.speak("师傅，咱们别去西天了，改去月宫吧");
}
}
import java.applet.*;
import java.awt.*;
public class boy extends Applet
{
public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawString("我一边喝着咖啡，一边学Java呢",2,30);
g.setColor(Color.blue);
g.drawString("我学得很认真",10,50);
}
}
public class Example2_1
{
public static void main (String args[ ])
{
char chinaWord='你',japanWord='ぁ';
int p1=20328,p2=12358;
System.out.println("汉字/'你/'字在unicode表中的顺序位置:"+(int)chinaWord);
System.out.println("日语/'ぁ/'字在unicode表中的顺序位置:"+(int)japanWord);
System.out.println("unicode表中第20328位置上的字符是:"+(char)p1);
System.out.println("unicode表中第12358位置上的字符是:"+(char)p2);
}
}
class Example3_1
{ public static void main(String args[])
{char a1='十',a2='点',a3='进',a4='攻';
char secret='8';
a1=(char)(a1^secret); a2=(char)(a2^secret);
a3=(char)(a3^secret); a4=(char)(a4^secret);
System.out.println("密文:"+a1+a2+a3+a4);
a1=(char)(a1^secret); a2=(char)(a2^secret);
a3=(char)(a3^secret); a4=(char)(a4^secret);
System.out.println("原文:"+a1+a2+a3+a4);
}
}
class Example3_2
{ public static void main(String args[])
{ int x,y=10;
if(((x=0)==0)||((y=20)==20))
{ System.out.println("现在y的值是:"+y);
}
int a,b=10;
if(((a=0)==0)|((b=20)==20))
{ System.out.println("现在b的值是:"+b);
}
}
}
public class Example3_3
{ public static void main(String args[])
{ int a=9,b=5,c=7,t;
if(a>b)
{ t=a; a=b; b=t;
}
if(a>c)
{ t=a; a=c; c=t;
}
if(b>c)
{ t=b; b=c; c=t;
}
System.out.println("a="+a+",b="+b+",c="+c);
}
}
public class Example3_4
{ public static void main(String args[])
{int math=65 ,english=85;
if(math>60)
{ System.out.println("数学及格了");
}
else
{ System.out.println("数学不及格");
}
if(english>90)
{ System.out.println("英语是优");
}
else
{ System.out.println("英语不是优");
}
if(math>60&&english>90)
{ System.out.println("英语是优,数学也及格了");
}
System.out.println("我在学习控制语句");
}
}
import Java.applet.*;import Java.awt.*;
public class Example3_5 extends Applet
{ public void paint(Graphics g)
{ int x=2,y=1;
switch(x+y)
{case 1 :
g.setColor(Color.red);g.drawString("i am 1",5,10);
break;
case 2:
g.setColor(Color.blue); g.drawString("i am 2",5,10);
break;
case 3:
g.setColor(Color.green); g.drawString("i am 3",5,10);
break;
default: g.drawString("没有般配的",5,10);
}
}
}
import Java.applet.*;import Java.awt.*;
public class Example3_6 extends Applet
{ public void paint(Graphics g)
{ int sum=0;
for(int i=1;i<=100;i++)
{ sum=sum+i;
}
g.drawString("sum= "+sum,10,20);
}
}
import Java.applet.*;import Java.awt.*;
public class Example3_7 extends Applet
{ public void paint(Graphics g)
{ long jiecheng=1;
for(int i=10;i>=1;i--)
{ jiecheng=jiecheng*i;
}
g.drawString("10的阶乘是 "+jiecheng,10,20);
}
}
class Example3_8
{ public static void main(String args[])
{ double sum=0,a=1;int i=1;
while(i<=20)
{ a=a*(1.0/i);
sum=sum+a;
i=i+1;
}
System.out.println("sum="+sum);
}
}
class Example3_9
{ public static void main(String args[])
{ int sum=0,i,j;
for( i=1;i<=10;i++) //计算1+3+5+7+9。
{ if(i%2==0)
continue;
sum=sum+i;
}
System.out.println("sum="+sum);
for( j=2;j<=50;j++) //求50以内的素数
{ for( i=2;i<=j/2;i++)
{if(j%i==0)
break;
}
if(i>j/2)
{System.out.println(""+j+"是素数");
}
}
}
}
class XiyoujiRenwu
{ float height,weight;
String head, ear,hand,foot, mouth;
void speak(String s)
{ System.out.println(s);
}
}
class A
{ public static void main(String args[])
{ XiyoujiRenwu zhubajie; //声明对象。
zhubajie=new XiyoujiRenwu(); //为对象分配内存，使用new 运算符和默认的构造方法。
}
}
class Point
{ int x,y;
Point(int a,int b)
{ x=a;
y=b;
}
}
public class A
{ public static void main(String args[])
{ Point p1,p2; //声明对象p1和p2。
p1=new Point(10,10); //为对象分配内存，使用 new 和类中的构造方法。
p2=new Point(23,35); //为对象分配内存，使用 new 和类中的构造方法。
}
}
class XiyoujiRenwu
{ float height,weight;
String head, ear,hand,foot, mouth;
void speak(String s)
{ head="歪着头";
System.out.println(s);
}
}
class Example4_3
{ public static void main(String args[])
{ XiyoujiRenwu zhubajie,sunwukong;//声明对象。
zhubajie=new XiyoujiRenwu(); //为对象分配内存，使用new 运算符和默认的构造方法。
sunwukong=new XiyoujiRenwu();
zhubajie.height=1.80f; //对象给自己的变量赋值。
zhubajie.weight=160f; zhubajie.hand="两只黑手";
zhubajie.foot="两只大脚"; zhubajie.head="大头";
zhubajie.ear="一双大耳朵"; zhubajie.mouth="一只大嘴";
sunwukong.height=1.62f; //对象给自己的变量赋值。
sunwukong.weight=1000f; sunwukong.hand="白嫩小手";
sunwukong.foot="两只绣脚"; sunwukong.head="绣发飘飘";
sunwukong.ear="一对小耳"; sunwukong.mouth="樱头小嘴";
System.out.println("zhubajie的身高："+zhubajie.height);
System.out.println("zhubajie的头："+zhubajie.head);
System.out.println("sunwukong的重量："+sunwukong.weight);
System.out.println("sunwukong的头："+sunwukong.head);
zhubajie.speak("俺老猪我想娶媳妇"); //对象调用方法。
System.out.println("zhubajie现在的头："+zhubajie.head);
sunwukong.speak("老孙我重1000斤，我想骗八戒背我"); //对象调用方法。
System.out.println("sunwukong现在的头："+sunwukong.head);
}
}
import Java.applet.*;
import Java.awt.*;
class Student
{ float math,english,sum;
float f(float k1,float k2)
{ sum=k1*math+k2*english;
return sum;
}
}
public class Example4_4 extends Applet
{ Student wanghong,lihong;
public void init()
{ wanghong=new Student(); lihong =new Student();
wanghong.math=60.0f; wanghong.english=80f;
lihong.math=70.0f; lihong.english=90.0f;
wanghong.sum=wanghong.f(2.0f,2.0f);
lihong.sum=lihong.f(2.0f,2.0f);
}
public void paint(Graphics g)
{ g.drawString("lihong sum= "+lihong.sum,12,45);
g.drawString("wanghong sum="+wanghong.sum,12,60);
}
}
class 梯形
{ float 上底,下底,高;
梯形()
{ 上底=60;
下底=40;
高=20;
}
梯形(float x,float y,float h)
{ 上底=x;
下底=y;
高=h;
}
float 计算面积()
{ float 面积;
面积=(上底+下底)*高/2.0f;
return 面积;
}
void 修改高(float height)
{ 高=height;
}
float 获取高()
{ return 高;
}
}
class Example4_5
{ public static void main(String args[])
{ 梯形 laderOne=new 梯形(),laderTwo=new 梯形(2.0f,3.0f,10);
System.out.println("laderOne的高是:"+laderOne.获取高());
System.out.println("laderTwo的高是:"+laderTwo.获取高());
System.out.println("laderOne的面积是:"+laderOne.计算面积());
System.out.println("laderTwo的面积是:"+laderTwo.计算面积());
laderOne.修改高(10);
float h=laderOne.获取高();
laderTwo.修改高(h*2);
System.out.println("laderOne现在的高是:"+laderOne.获取高());
System.out.println("laderTwo现在的高是:"+laderTwo.获取高());
System.out.println("laderOne现在的面积是:"+laderOne.计算面积());
System.out.println("laderTwo现在的面积是:"+laderTwo.计算面积());
}
}
class 圆
{ double 半径;
圆(double r)
{ 半径=r;
}
double 计算面积()
{ return 3.14*半径*半径;
}
void 修改半径(double 新半径)
{ 半径=新半径;
}
double 获取半径()
{ return 半径;
}
}
class 圆锥
{ 圆 底圆;
double 高;
圆锥(圆 circle,double h)
{ this.底圆=circle;
this.高=h;
}
double 计算体积()
{ double volume;
volume=底圆.计算面积()*高/3.0;
return volume;
}
void 修改底圆半径(double r)
{ 底圆.修改半径(r);
}
double 获取底圆半径()
{ return 底圆.获取半径();
}
}
class Example4_6
{ public static void main(String args[])
{ 圆 circle=new 圆(10);
圆锥 circular=new 圆锥(circle,20);
System.out.println("圆锥底圆半径:"+circular.获取底圆半径());
System.out.println("圆锥的体积:"+circular.计算体积());
circular.修改底圆半径(100);
System.out.println("圆锥底圆半径:"+circular.获取底圆半径());
System.out.println("圆锥的体积:"+circular.计算体积());
}
}
class 梯形
{ float 上底,高;
static float 下底;
梯形(float x,float y,float h)
{ 上底=x; 下底=y; 高=h;
}
float 获取下底()
{ return 下底;
}
void 修改下底(float b)
{ 下底=b;
}
}
class Example4_7
{ public static void main(String args[])
{ 梯形 laderOne=new 梯形(3.0f,10.0f,20),laderTwo=new 梯形(2.0f,3.0f,10);
System.out.println("laderOne的下底:"+laderOne.获取下底());
System.out.println("laderTwo的下底:"+laderTwo.获取下底());
laderTwo.修改下底(60);
System.out.println("laderOne的下底:"+laderOne.获取下底());
System.out.println("laderTwo的下底:"+laderTwo.获取下底());
}
}
import Java.applet.*;
import Java.awt.*;
class Family
{ static String familyname;
String name;
int age;
}
public class Example4_8 extends Applet
{ Family father,son1,son2;
public void init()
{ father=new Family();
son1=new Family();son2=new Family();
Family.familyname="打"; father.name="鬼子";
son1.name="汉奸"; son2.name="恶霸";
}
public void paint(Graphics g)
{ g.drawString("father: "+father.familyname+father.name,5,10);
g.drawString("son1: "+son1.familyname+son1.name,5,20);
g.drawString("son2: "+son2.familyname+son2.name,5,30);
Family.familyname="杀";
g.drawString("father:"+father.familyname+father.name,5,40);
g.drawString("son1: "+son1.familyname+son1.name,5,50);
g.drawString("son2: "+son2.familyname+son2.name,5,65);
}
}
class Fibi
{ public long fibinacii(int n)
{ long c=0;
if(n==1||n==2)
c=1;
else
c=fibinacii(n-1)+fibinacii(n-2);
return c;
}
}
public class Example4_9
{ public static void main(String args[])
{ Fibi a=new Fibi();
for(int i=1;i<=10;i++)
{ System.out.print(" "+a.fibinacii(i));
}
}
}
class 三角形
{ double a,b,c;
三角形(double a,double b,double c)
{ setABC(this,a,b,c);
}
void setABC(三角形 trangle,double a,double b,double c)
{ trangle.a=a;
trangle.b=b;
trangle.c=c;
}
}
class Example4_10
{ public static void main(String args[])
{三角形 tra=new 三角形(3,4,5);
System.out.print("三角形型的三边是:"+tra.a+","+tra.b+","+tra.c+",");
}
}
package tom.jiafei;
public class PrimNumber
{ public static void main(String args[])
{ int sum=0,i,j;
for( i=1;i<=10;i++) //找出10以内的素数。
{ for(j=2;j<=i/2;j++)
{ if(i%j==0)
break;
}
if(j>i/2) System.out.print(" 素数："+i);
}
}
}
import Java.applet.Applet;import Java.awt.*;
public class Example4_12 extends Applet
{ Button redbutton;
public void init()
{ redbutton=new Button("我是一个红色的按钮");
redbutton.setBackground(Color.red);
add(redbutton);
}
public void paint(Graphics g)
{ g.drawString("it is a button",30,50);
}
}
import tom.jiafei.*; //引入包tom.jiafei中的类。
public class Example4_13
{ public static void main(String args[])
{ PrimNumber num=new PrimNumber();//用包tom.jiafei中的类创建对象。
String a[]={"ok"};
System.out.println(a[0]);
num.main(a);
}
}
public class Example4_14
{ public static void main(String args[])
{ PrimNumber num=new PrimNumber();//要保证PrimNuber类和Example4_14类在同一目录中
String a[]={"ok"};
System.out.println(a[0]);
num.main(a);
}
}
package tom.jiafei;
public class Trangle
{ double sideA,sideB,sideC;
boolean boo;
public Trangle(double a,double b,double c)
{ sideA=a;sideB=b;sideC=c;
if(a+b>c&&a+c>b&&c+b>a)
{ System.out.println("我是一个三角形");
boo=true;
}
else
{ System.out.println("我不是一个三角形");
boo=false;
}
}
public void 计算面积()
{ if(boo)
{ double p=(sideA+sideB+sideC)/2.0;
double area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC)) ;
System.out.println("面积是:"+area);
}
else
{ System.out.println("不是一个三角形,不能计算面积");
}
}
public void 修改三边(double a,double b,double c)
{ sideA=a;sideB=b;sideC=c;
if(a+b>c&&a+c>b&&c+b>a)
{ boo=true;
}
else
{ boo=false;
}
}
}
import tom.jiafei.*;
class Example4_15
{ public static void main(String args[])
{ Trangle trangle=new Trangle(12,3,1);
trangle.计算面积();
trangle.修改三边(3,4,5);
trangle.计算面积();
}
}
class Example4_16
{ private int money;
Example4_16()
{ money=2000;
}
private int getMoney()
{ return money;
}
public static void main(String args[])
{ Example4_16 exa=new Example4_16();
exa.money=3000;int m=exa.getMoney();
System.out.println("money="+m);
}
}
import Java.applet.*;
import Java.awt.*;
class Father
{ private int money;
float weight,height;
String head;
String speak(String s)
{ return s ;
}
}
class Son extends Father
{ String hand ,foot;
}
public class Example4_17 extends Applet
{ Son boy;
public void init()
{ boy=new Son();
boy.weight=1.80f; boy.height=120f;
boy.head="一个头"; boy.hand="两只手 ";
boy.foot="两只脚";
}
public void paint(Graphics g)
{ g.drawString(boy.speak("我是儿子"),5,20);
g.drawString(boy.hand+boy.foot+boy.head+boy.weight+boy.height,5,40);
}
}
package tom.jiafei;
public class Father
{ int height;
protected int money;
public int weight;
public Father(int m) {
{ money=m;
}
protected int getMoney()
{ return money;
}
void setMoney(int newMoney)
{ money=newMoney;
}
}
package sun.com;
import tom.jiafei.Father;
public class Jerry extends Father //Jerry和Father在不同的包中.
{ public Jerry()
{ super(20);
}
public static void main(String args[])
{ Jerry jerry=new Jerry();
jerry.height=12; //非法，因为Jerry没有继承友好的height。
jerry.weight=200; //合法。
jerry.money=800; //合法。
int m=jerry.getMoney(); //合法。.
jerry.setMoney(300); //非法，因为Jerry没有继承友好的方法setMoney。
System.out.println("m="+m);
}
}
import Java.applet.*;
import Java.awt.*;
class Chengji
{ float f(float x,float y)
{ return x*y;
}
}
class Xiangjia extends Chengji
{ float f(float x,float y)
{ return x+y ;
}
}
public class Example4_19 extends Applet
{ Xiangjia sum;
public void init()
{ sum=new Xiangjia();
}
public void paint(Graphics g)
{ g.drawString("sum="+sum.f(4,6),100,40);
}
}
import Java.applet.*;
import Java.awt.*;
class Area
{ float f(float r )
{ return 3.14159f*r*r;
}
float g(float x,float y)
{ return x+y;
}
}
class Circle extends Area
{ float f(float r)
{ return 3.14159f*2.0f*r;
}
}
public class Example4_20 extends Applet
{ Circle yuan;
public void init()
{ yuan=new Circle();
}
public void paint(Graphics g)
{ g.drawString("yuan= "+yuan.f(5.0f),5,20); //调用子类重写的方法f。
g.drawString(" "+yuan.g(2.0f,8.0f),5,40); //调用继承父类的方法g。
}
}
class 类人猿
{ private int n=100;
void crySpeak(String s)
{ System.out.println(s);
}
}
class People extends 类人猿
{ void computer(int a,int b)
{ int c=a*b;
System.out.println(c);
}
void crySpeak(String s)
{ System.out.println("**"+s+"**");
}
}
class Example4_21
{ public static void main(String args[])
{ 类人猿 monkey=new People(); //monkey是People对象的上转型对象。
monkey.crySpeak("I love this game");
People people=(People)monkey; //把上转型对象强制转化为子类的对象。
people.computer(10,10);
}
}
class 动物
{ void cry()
{
}
}
class 狗 extends 动物 {
{ void cry()
{ System.out.println("汪汪.....");
}
}
class 猫 extends 动物
{ void cry()
{ System.out.println("喵喵.....");
}
}
class Example4_22
{ public static void main(String args[])
{ 动物 dongwu;
if(Math.random()>=0.5)
{
dongwu=new 狗();
dongwu.cry();
}
else
{
dongwu=new 猫();
ongwu.cry();
}
}
}
abstract class 图形
{ public abstract double 求面积();
}
class 梯形 extends 图形
{ double a,b,h;
梯形(double a,double b,double h)
{ this.a=a;this.b=b;this.h=h;
}
public double 求面积()
{ return((1/2.0)*(a+b)*h);
}
}
class 圆形 extends 图形
{ double r;
圆形(double r)
{ his.r=r;
}
public double 求面积()
{ return(3.14*r*r);
}
}
class 堆
{ 图形底;
double 高;
堆(图形 底,double 高)
{ this.底=底;
this.高=高;
}
void 换底(图形 底)
{ this.底=底;
}
public double 求体积()
{ return (底.求面积()*高)/3.0;
}
}
public class Example4_23
{ public static void main(String args[])
{ 堆 zui;
图形 tuxing;
tuxing=new 梯形(2.0,7.0,10.7);
System.out.println("梯形的面积"+tuxing.求面积());
zui=new 堆(tuxing,30);
System.out.println("梯形底的堆的体积"+zui.求体积());
tuxing=new 圆形(10);
System.out.println("半径是10的圆的面积"+tuxing.求面积());
zui.换底(tuxing);
System.out.println("圆形底的堆的体积"+zui.求体积());
}
}
class Student
{ int number;String name;
Student(int number,String name)
{ this.number=number;this.name=name;
System.out.println("I am "+name+ "my number is "+number);
}
}
class Univer_Student extends Student
{ boolean 婚否;
Univer_Student(int number,String name,boolean b)
{ super(number,name);
婚否=b;
System.out.println("婚否="+婚否);
}
}
public class Example4_24
{ public static void main(String args[])
{ Univer_Student zhang=new Univer_Student(9901,"和晓林",false);
}
}
class Sum
{ int n;
float f()
{ float sum=0;
for(int i=1;i<=n;i++)
sum=sum+i;
return sum;
}
}
class Average extends Sum
{ int n;
float f()
{ float c;
super.n=n;
c=super.f();
return c/n;
}
float g()
{ float c;
c=super.f();
return c/2;
}
}
public class Example4_25
{ public static void main(String args[])
{ Average aver=new Average();
aver.n=100;
float result_1=aver.f();
float result_2=aver.g();
System.out.println("result_1="+result_1);
System.out.println("result_2="+result_2);
}
}
import Java.applet.*;import Java.awt.*;
interface Computable
{ final int MAX=100;
void speak(String s);
int f(int x);
float g(float x,float y);
}
class China implements Computable
{ int xuehao;
public int f(int x) //不要忘记public关键字。
{ int sum=0;
for(int i=1;i<=x;i++)
{ sum=sum+i;
}
return sum;
}
public float g(float x,float y)
{ return 6; //至少有return语句。
}
public void speak(String s)
{
}
}
class Japan implements Computable
{ int xuehao;
public int f(int x)
{ return 68;
}
public float g(float x,float y)
{ return x+y;
}
public void speak(String s)
{ //必须有方法体，但体内可以没有任何语句。
}
}
public class Example4_26 extends Applet
{ China Li; Japan Henlu;
public void init()
{ Li=new China(); Henlu=new Japan();
Li.xuehao=991898; Henlu.xuehao=941448;
}
public void paint(Graphics g)
{ g.drawString("xuehao:"+Li.MAX+Li.xuehao+"从1到100求和"+Li.f(100),10,20);
g.drawString("xuehao:"+Henlu.MAX+Henlu.xuehao+"加法"+Henlu.g(2.0f,3.0f),10,40);
}
}
interface 收费
{ public void 收取费用();
}
class 公共汽车 implements 收费
{ public void 收取费用()
{ System.out.println("公共汽车:一元/张,不计算公里数");
}
}
class 出租车 implements 收费
{ public void 收取费用()
{ System.out.println("出租车:1.60元/公里,起价3公里");
}
}
class 电影院 implements 收费
{ public void 收取费用()
{ System.out.println("电影院:门票,十元/张");
}
}
class Example4_27
{ public static void main(String args[])
{ 公共汽车 七路=new 公共汽车();
出租车 天宇=new 出租车();
电影院 红星=new 电影院();
七路.收取费用();天宇.收取费用();
红星.收取费用();
}
}
interface ShowMessage
{ void 显示商标(String s);
}
class TV implements ShowMessage
{ public void 显示商标(String s)
{ System.out.println(s);
}
}
class PC implements ShowMessage
{ public void 显示商标(String s)
{ System.out.println(s);
}
}
public class Example4_28
{ public static void main(String args[])
{ ShowMessage sm; //声明接口变量。
sm=new TV(); //接口变量中存放对象的引用。
sm.显示商标("长城牌电视机"); //接口回调。
sm=new PC(); //接口变量中存放对象的引用。
sm.显示商标("联想奔月5008PC机"); //接口回调。
}
}
interface Computerable
{ public double 求面积();
}
class 梯形 implements Computerable
{ double a,b,h;
梯形(double a,double b,double h)
{ this.a=a;this.b=b;this.h=h;
}
public double 求面积()
{ return((1/2.0)*(a+b)*h);
}
}
class 圆形 implements Computerable
{ double r;
圆形(double r)
{ this.r=r;
}
public double 求面积()
{ eturn(3.14*r*r);
}
}
class 堆
{ Computerable 底; //声明一个接口变量,可以回调"求面积"方法。
double 高;
堆(Computerable 底,double 高)
{ this.底=底;
this.高=高;
}
void 换底(Computerable 底)
{ this.底=底;
}
public double 求体积()
{ return (底.求面积()*高)/3.0;
}
}
public class Example4_29
{ public static void main(String args[])
{ 堆 zui;
Computerable bottom;
bottom=new 梯形(2.0,7.0,10.7); //接口变量中存放对象的引用。
System.out.println("梯形的面积"+bottom.求面积()); //bottom接口回调，求面积。
zui=new 堆(bottom,30);
System.out.println("梯形底的堆的体积"+zui.求体积());
bottom=new 圆形(10); //接口变量中存放对象的引用。
System.out.println("半径是10的圆的面积"+bottom.求面积());
zui.换底(bottom);
System.out.println("圆形底的堆的体积"+zui.求体积());
}
}
import Java.applet.*; import Java.awt.*;
public class Example5_1 extends Applet
{ float a[];
public void init()
{ a=new float[5];
a[0]=23.9f;a[1]=34.9f;a[2]=45f;a[3]=56.98f;a[4]=100f;
}
public void paint(Graphics g)
{
g.drawString("a[0]="+a[0]+"a[1]="+a[1]+"a[2]"+a[2]+"a[3]="+a[3]+"a[4]="+ a[4],12,12);
}
}
import Java.applet.*;import Java.awt.*;
public class Example5_2 extends Applet
{ String tom;
public void init()
{ tom="220302620629021";
}
public void paint(Graphics g)
{ if((tom.startsWith("220302"))&&(tom.endsWith("1")||tom.endsWith("3")))
g.drawString("tom是吉林人,男性",10,10);
}
}
class Example5_3
{ public static void main(String args[])
{ int number=0;
String s="student;entropy;engage,english,client";
for(int k=0;k<s.length();k++)
{ if(s.regionMatches(k,"en",0,2))
{ number++;
}
}
System.out.println("number="+number);
}
}
class Example5_4
{ public static void main(String args[])
{ String a[]={"boy","apple","Applet","girl","Hat"};
for(int i=0;i<a.length-1;i++)
{for(int j=i+1;j<a.length;j++)
{ if(a[j].compareTo(a[i])<0)
{ String temp=a[i];
a[i]=a[j];
a[j]=temp;
}
}
}
for(int i=0;i<a.length;i++)
{ System.out.print(" "+a[i]);
}
}
}
public class Example5_5
{ public static void main(String args[])
{ double n,sum=0.0 ;
for(int i=0;i<args.length;i++)
{ sum=sum+Double.valueOf(args[i]).doubleValue();
}
n=sum/args.length;
System.out.println("平均数:"+n);
}
}
import Java.util.Date;
import Java.awt.*;
public class Example5_6
{ public static void main(String args[])
{ Date date=new Date();
Button button=new Button("确定");
System.out.println(date.toString());
System.out.println(button.toString());
}
}
import Java.util.*;
public class Example5_7
{ public static void main(String args[])
{ String s="I am Geng.X.y,she is my girlfriend";
StringTokenizer fenxi=new StringTokenizer(s," ,"); //空格和逗号做分
int number=fenxi.countTokens();
while(fenxi.hasMoreTokens())
{ String str=fenxi.nextToken();
System.out.println(str);
System.out.println("还剩"+fenxi.countTokens()+"个单词");
}
System.out.println("s共有单词："+number+"个");
}
}
import Java.util.*;
public class Example5_8
{ public static void main(String args[])
{ String s=new String("abcABC123");
System.out.println(s);
char a[]=s.toCharArray();
for(int i=0;i<a.length;i++)
{ if(Character.isLowerCase(a[i]))
{ a[i]=Character.toUpperCase(a[i]);
}
else if(Character.isUpperCase(a[i]))
{ a[i]=Character.toLowerCase(a[i]);
}
}
s=new String(a);
System.out.println(s);
}
}
class Example5_9
{ public static void main(String args[])
{ char c[],d[];
String s="巴西足球队击败德国足球队";
c=new char[2];
s.getChars(5,7,c,0);
System.out.println(c);
d=new char[s.length()];
s.getChars(7,12,d,0);
s.getChars(5,7,d,5);
s.getChars(0,5,d,7);
System.out.println(d);
}
}
class Example5_10
{ public static void main(String args[])
{ String s="清华大学出版社";
char a[]=s.toCharArray();
for(int i=0;i<a.length;i++)
{ a[i]=(char)(a[i]^'t');
}
String secret=new String(a); System.out.println("密文:"+secret);
for(int i=0;i<a.length;i++)
{ a[i]=(char)(a[i]^'t');
}
String code=new String(a); System.out.println("原文:"+code);
}
}
public class Example5_11
{ public static void main(String args[])
{ byte d[]="你我他".getBytes();
System.out.println("数组d的长度是(一个汉字占两个字节):"+d.length);
String s=new String(d,0,2);
System.out.println(s);
}
}
import Java.util.Date;
import Java.text.SimpleDateFormat;
class Example6_1
{ public static void main(String args[])
{ Date nowTime=new Date();
System.out.println("现在的时间:"+nowTime);
SimpleDateFormat matter1=new SimpleDateFormat("yyyy年MM月dd日 北京时间");
System.out.println("现在的时间:"+matter1.format(nowTime));
SimpleDateFormat matter2=
new SimpleDateFormat("yyyy年MM月Edd日HH时mm分ss秒 北京时间");
System.out.println("现在的时间:"+matter2.format(nowTime));
SimpleDateFormat matter3=
new SimpleDateFormat("北京时间dd日HH时MMM ss秒mm分EE");
System.out.println("现在的时间:"+matter3.format(nowTime));
}
}
import Java.util.Date;
class Example6_2
{ public static void main(String args[])
{ long time1=System.currentTimeMillis();
Date date=new Date(time1);
System.out.println(date);
String s=String.valueOf(time1);
int length=s.length(); s=s.substring(length-8);
System.out.println(s);
long result=f(28);
System.out.println("result="+result);
long time2=System.currentTimeMillis();//计算f(28)之后的时间。
s=String.valueOf(time2);
length=s.length(); s=s.substring(length-8);
System.out.println(s);
System.out.println("用时："+(time2-time1)+"毫秒");
}
public static long f(long n)
{ long c=0;
if(n==1||n==2) c=1;
else if(n>=3) c=f(n-1)+f(n-2);
return c;
}
}
import Java.util.*;
class Example6_3
{ public static void main(String args[])
{ Calendar calendar=Calendar.getInstance(); //创建一个日历对象。
calendar.setTime(new Date()); //用当前时间初始化日历时间。
String 年=String.valueOf(calendar.get(Calendar.YEAR)),
月=String.valueOf(calendar.get(Calendar.MONTH)+1),
日=String.valueOf(calendar.get(Calendar.DAY_OF_MONTH)),
星期=String.valueOf(calendar.get(Calendar.DAY_OF_WEEK)-1);
int hour=calendar.get(Calendar.HOUR_OF_DAY),
minute=calendar.get(Calendar.MINUTE),
second=calendar.get(Calendar.SECOND);
System.out.println("现在的时间是：");
System.out.println(""+年+"年"+月+"月"+日+"日 "+ "星期"+星期);
System.out.println(""+hour+"时"+minute+"分"+second+"秒");
calendar.set(1962,5,29); //将日历翻到1962年6月29日,注意5表示六月。
long time1962=calendar.getTimeInMillis();
calendar.set(2003,9,5); //将日历翻到2003年10月5日。9表示十月。
long time2003=calendar.getTimeInMillis();
long 相隔天数=(time2003-time1962)/(1000*60*60*24);
System.out.println("2003年10月5日和1962年6月29日相隔"+相隔天数+"天");
}
}
import Java.util.*;
class Example6_4
{ public static void main(String args[])
{ System.out.println(" 日 一 二 三 四 五 六");
Calendar 日历=Calendar.getInstance(); //创建一个日历对象。
日历.set(2004,0,1); //将日历翻到2004年1月1日,注意0表示一月。
//获取1日是星期几(get方法返回的值是1表示星期日,星期六返回的值是7):
int 星期几=日历.get(Calendar.DAY_OF_WEEK)-1;
String a[]=new String[星期几+31]; //存放号码的一维数组
for(int i=0;i<星期几;i++)
{ a[i]="**";
}
for(int i=星期几,n=1;i<星期几+31;i++)
{ if(n<=9)
a[i]=String.valueOf(n)+" ";
else
a[i]=String.valueOf(n) ;
n++;
}
//打印数组：
for(int i=0;i<a.length;i++)
{ if(i%7==0)
{ System.out.println(""); //换行。
}
System.out.print(" "+a[i]);
}
}
}
import Java.text.NumberFormat;
class Example6_5
{ public static void main(String args[])
{ double a=Math.sqrt(5);
System.out.println("格式化前："+a);
NumberFormat f=NumberFormat.getInstance();
f.setMaximumFractionDigits(5);f.setMinimumIntegerDigits(3);
String s=f.format(a);
System.out.println("格式化后："+s);System.out.println("得到的随机数：");
int number=8;
for(int i=1;i<=20;i++)
{ int randomNumber=(int)(Math.random()*number)+1;//产生1到8之间的随机数。
System.out.print(" "+randomNumber);
if(i%10==0)
System.out.println("");
}
}
}
import Java.awt.*;
class Example7_1
{ public static void main(String args[])
{ Frame fr=new Frame("媒体新闻"); // 一个容器对象。
fr.setLayout(new FlowLayout());
Button button1=new Button("确定 ");
Button button2=new Button("取消");
fr.add(button1);
fr.add(button2);
fr.setSize(200,300); //调用方法setSize(int,int)设置容器的大小。
fr.setBackground(Color.cyan);
fr.setVisible(true);
fr.validate();
}
}
import Java.applet.*;
import Java.awt.*;
public class Example8_1 extends Applet
{ Button button1; Button button2;
int sum;
public void init()
{ button1=new Button("yes");
button2=new Button("No");
add(button1);
add(button2);
}
public void start()
{ sum=0;
for(int i=1;i<=100;i++)
{ sum=sum+i;
}
}
public void stop() { }
public void destroy(){ }
public void paint(Graphics g)
{ g.setColor(Color.blue);
g.drawString("程序设计方法",20,60);
g.setColor(Color.red);
g.drawString("sum="+sum,20,100);
}
}
import Java.applet.*;import Java.awt.*;
public class Example8_3 extends Applet
{ int x;
public void init()
{ x=5;
}
public void paint(Graphics g)
{ x=x+1;
if(x>=200)
x=5;
g.drawString("我们在学习repaint方法",20,x);
repaint();
}
}
import Java.applet.*;import Java.awt.*;
public class Boy extends Applet
{ TextField text1,text2,text3;
public void init()
{ text1=new TextField("输入密码：",10);
text1.setEditable(false);
text2=new TextField(10);
text2.setEchoChar('*');
text3=new TextField("我是一个文本框",20);
add(text1);add(text2);add(text3);
text3.setText("重新设置了文本");
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example9_2 extends Applet implements ActionListener
{ TextField text1,text2,text3;
public void init()
{ text1=new TextField(10);
text2=new TextField(10);
text3=new TextField(20);
add(text1);add(text2);add(text3);
text1.addActionListener(this); //将主类的实例作为text1的监视器，
//因此主类必须实现接口ActionListener 。
text2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==text1)
{ String word=text1.getText();
if(word.equals("boy"))
{ text3.setText("男孩");
}
else if (word.equals("girl"))
{ text3.setText("女孩");
}
else if (word.equals("sun"))
{ text3.setText("太阳");
}
else
{text3.setText("没有该单词");
}
}
else if(e.getSource()==text2)
{ String word=text2.getText();
if(word.equals("男孩"))
{ text3.setText("boy");
}
else if (word.equals("女孩"))
{ text3.setText("girl");
}
else if (word.equals("太阳"))
{ text3.setText("sun");
}
else
{ text3.setText("没有该单词");
}
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example9_3 extends Applet implements ActionListener
{ TextField text1,text2,text3;
PoliceMan police;
public void init()
{ text1=new TextField(10);
text2=new TextField(10);
text3=new TextField(10);
police=new PoliceMan(this);
add(text1);add(text2);add(text3);
text1.addActionListener(this);
text1.addActionListener(police);
}
public void actionPerformed(ActionEvent e)
{ String number=e.getActionCommand();
int n=Integer.parseInt(number);
int m=n*n;text2.setText(n+"的平方是:"+m);
}
}
class PoliceMan implements ActionListener
{ Example9_3 a=null;
PoliceMan(Example9_3 a)
{ this.a=a;
}
public void actionPerformed(ActionEvent e)
{ String number=e.getActionCommand();
int n=Integer.parseInt(number);
int m=n*n*n;a.text3.setText(n+"的立方是:"+m);
}
}
import Java.applet.*;import Java.awt.*;
public class Example9_4 extends Applet
{ TextArea text1,text2;
public void init()
{ text1=new TextArea("我是学生",6,16);
text2=new TextArea(6,16);
add(text1);add(text2);
text2.append("我在学习Java语言");
text1.insert("们",1);
text1.selectAll();
int length=text2.getText().length();
text2.setSelectionStart(2);
text2.setSelectionEnd(length);
}
}
import Java.util.*;import Java.applet.*;
import Java.awt.*;import Java.awt.event.*;
public class Example9_5 extends Applet implements TextListener
{ TextArea text1,text2;
public void init()
{ text1=new TextArea(6,15);
text2=new TextArea(6,15);
add(text1);add(text2);
text2.setEditable(false);
text1.addTextListener(this) ;
}
public void textValueChanged(TextEvent e)
{ if(e.getSource()==text1)
{ String s=text1.getText();
StringTokenizer fenxi=new StringTokenizer(s," ,'/n'");
int n=fenxi.countTokens();
String a[]=new String[n];
for(int i=0;i<=n-1;i++)
{ String temp=fenxi.nextToken();
a[i]=temp;
}
for(int i=0;i<=n-1;i++) //按字典序从小到大排序。
{ for(int j=i+1;j<=n-1;j++)
{ if(a[j].compareTo(a[i])<0)
{ String t=a[j]; a[j]=a[i]; a[i]=t;
}
}
}
text2.setText(null); //刷新显示。
for(int i=0;i<n;i++)
{ text2.append(a[i]+"/n");
}
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example10_1 extends Applet implements ActionListener
{ TextField text;
Button buttonEnter,buttonQuit;
public void init(){
{ text=new TextField("0",10); add(text);
buttonEnter=new Button("确定"); buttonQuit =new Button("清除");
add(buttonEnter); add(buttonQuit);
buttonEnter.addActionListener(this);
buttonQuit.addActionListener(this);
text.addActionListener(this);
}
public void paint(Graphics g)
{ g.drawString("在文本框输入数字字符回车或单击按钮",10,100);
g.drawString("第文本框显示该数的平方根",10,120);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==buttonEnter||e.getSource()==text)
{ double number=0;
try { number=Double.valueOf(text.getText()).doubleValue();
text.setText(""+Math.sqrt(number));
}
catch(NumberFormatException event)
{ text.setText("请输入数字字符");
}
}
else if(e.getSource()==buttonQuit)
{ text.setText("0");
}
}
}
import Java.awt.*;import Java.applet.*;import Java.awt.event.*;
//写一个按扭类的子类，增加一些新的功能:
class MyButton extends Button implements ActionListener,TextListener
{ TextArea text1,text2; //类的成员变量。
char save[];
MyButton(String s,Container con)
{ super(s);
text1=new TextArea(6,12); text2=new TextArea(6,12);
text2.setEditable(false);
text1.addTextListener(this); //创建的按扭监视其中一个文本区。
this.addActionListener(this); //创建的按扭自己监视自己。
con.add(text1);con.add(text2);con.add(this);
}
public void textValueChanged(TextEvent e) //实现接口。
{
String s=text1.getText();
StringBuffer strbuffer=new StringBuffer(s);
String temp=new String(strbuffer.reverse());
text2.setText(temp);
}
public void actionPerformed(ActionEvent e) //实现接口。
{ text2.setText(null);
String s=text1.getText();
int length=s.length();
save=new char[length];
//将字符串拷贝到数组save：
s.getChars(0,length,save,0);
for(int i=0;i<save.length;i++)
{ save[i]=(char)(save[i]^'你');
}
String temp=new String(save);
text2.setText(temp);
}
}
public class Example10_2 extends Applet implements ActionListener
{ MyButton mybutton;
Button button;
public void init()
{ mybutton=new MyButton("加密",this);
button=new Button("解密");
button.addActionListener(this);
add(button);
}
public void actionPerformed(ActionEvent e) //实现接口。
{ for(int i=0;i<mybutton.save.length;i++)
{ mybutton.save[i]=(char)(mybutton.save[i]^'你');
}
String temp=new String(mybutton.save);
mybutton.text2.setText(temp);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.event.*;
public class Example10_3 extends Applet
{ public void init()
{ MyButton1 button1=new MyButton1();
MyButton2 button2=new MyButton2();
setLayout(null);
add(button1);add(button2);
button1.setLocation(12,12);
button2.setLocation(60,12);
}
}
class MyButton1 extends Button implements ActionListener
{ int n=-1;
MyButton1()
{ setSize(25,160); addActionListener(this);
}
public void paint(Graphics g)
{ g.drawString("我",6,14); g.drawString("是",6,34);
g.drawString("一",6,54); g.drawString("个",6,74);
g.drawString("竖",6,94); g.drawString("按",6,114);
g.drawString("钮",6,134); g.drawString("!",8,154);
}
public void actionPerformed(ActionEvent e)
{ n=(n+1)%3;
if(n==0)
this.setBackground(Color.cyan);
else if(n==1)
this.setBackground(Color.orange);
else if(n==2)
this.setBackground(Color.pink);
}
}
class MyButton2 extends Button
{ MyButton2()
{ setSize(38,80); setBackground(Color.cyan);
}
public void paint(Graphics g)
{ g.setColor(Color.red);
g.fillOval(10,3,20,20); //在按扭上画圆，见17章。
g.setColor(Color.yellow); g.fillOval(10,28,20,20);
g.setColor(Color.green); g.fillOval(10,53,20,20);
}
}
import Java.awt.*;import Java.awt.event.*;import Java.applet.*;
class MyLabel extends Label implements ActionListener
{ String 标签上的初始名称;
TextField inputNumber;TextArea showResult;Button button;
MyLabel(String s,Container con)
{ super(s);
标签上的初始名称=s;
inputNumber=new TextField(10); showResult =new TextArea(10,10);
button=new Button("Enter");
button.addActionListener(this);inputNumber.addActionListener(this);
con.add(this);con.add(inputNumber);con.add(showResult);con.add(button);
}
public void actionPerformed(ActionEvent e)
{ long n=0;
showResult.setText(null);
try{ n=Long.valueOf(inputNumber.getText()).longValue();
this.setText(标签上的初始名称);
}
catch(NumberFormatException e1)
{ this.setText("请输入数字字符");
}
if(e.getSource()==inputNumber)
{ 求因子(n);
}
if(e.getSource()==button)
{ 求素数(n);
}
}
public void 求因子(long n)
{ for(int i=1;i<=n;i++)
{ if(n%i==0)
showResult.append("/n"+i);
}
}
public void 求素数(long n)
{ showResult.append("小于"+n+"的素数有:");
for(int i=1;i<=n;i++)
{ int j=0;
for(j=2;j<i;j++)
{ if(i%j==0) break;
}
if(j>=i)
{ showResult.append("/n"+i);
}
}
}
}
public class Example10_4 extends Applet
{ MyLabel lab;
public void init()
{ lab=new MyLabel("回车求该数的因子,单击按钮求出小于这个数的素数",this);
}
}
第十一章 面板和画布
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
class Mypanel extends Panel implements ActionListener
{ Button button1,button2,button3;
Color backColor;
Mypanel() //构造方法。当创建面板对象时,面板被初始化为有三个按钮。
{ button1=new Button("确定");button2=new Button("取消");button3=new Button("保存");
add(button1);add(button2);add(button3);
setBackground(Color.pink); //设置面板的底色。
backColor=getBackground(); //获取底色。
button1.addActionListener(this);button2.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button1)
{ setBackground(Color.cyan);
}
else if(e.getSource()==button2)
{ setBackground(backColor);
}
}
}
public class Example11_1 extends Applet
{ Mypanel panel1,panel2,panel3;
Button button;
public void init()
{ panel1=new Mypanel();panel2=new Mypanel();panel3=new Mypanel();
button=new Button("我不在那些面板里");
add(panel1);add(panel2);add(panel3);
add(button);
}
}
import Java.awt.*;import Java.applet.*;
public class Example11_2 extends Applet
{ Panel p ;
ScrollPane scrollpane;
public void init()
{ p=new Panel();
scrollpane=new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS);
p.add(new Button("one"));p.add(new Button("two"));
p.add(new Button("three"));p.add(new Button("four"));
scrollpane.add(p);//scrollpane添加一个面板。
add(scrollpane);//小程序添加滚动窗口。
}
}
import Java.awt.*;import Java.applet.*;
class Mycanvas extends Canvas
{ String s;
Mycanvas(String s)
{ this.s=s;
setSize(90,80);
setBackground(Color.cyan);
}
public void paint(Graphics g)
{ if(s.equals("circle"))
g.drawOval(20,25,30,30);
else if(s.equals("rect"))
g.drawRect(30,35,20,20);
}
}
public class Example11_3 extends Applet
{ Mycanvas canvas1,canvas2;
public void init()
{ canvas1=new Mycanvas("circle");canvas2=new Mycanvas("rect");
add(canvas1);
Panel p=new Panel();p.setBackground(Color.pink);
p.add(canvas2) ;
add(p);
}
}
import Java.awt.*;
import Java.applet.*;
import Java.awt.event.*;
class Mycanvas extends Canvas
{ int x,y,r;
int red,green,blue;
Mycanvas()
{ setSize(100,100);
setBackground(Color.cyan);
}
public void setX(int x)
{ this.x=x;
}
public void setY(int y)
{ this.y=y;
}
public void setR(int r)
{ this.r=r;
}
public void paint(Graphics g)
{ g.drawOval(x,y,2*r,2*r);
}
}
public class Example11_4 extends Applet implements ActionListener
{ Mycanvas canvas;
TextField inputR,inputX,inputY;
Button b;
public void init()
{ canvas=new Mycanvas();
inputR=new TextField(6);
inputX=new TextField(6);
inputY=new TextField(6);
add(new Label("输入圆的位置坐标："));
add(inputX);
add(inputY);
add(new Label("输入圆的半径："));
add(inputR);
b=new Button("确定");
b.addActionListener(this);
add(b);
add(canvas);
}
public void actionPerformed(ActionEvent e)
{ int x,y,r;
try {
x=Integer.parseInt(inputX.getText());
y=Integer.parseInt(inputY.getText());
r=Integer.parseInt(inputR.getText());
canvas.setX(x);
canvas.setY(y);
canvas.setR(r);
canvas.repaint();
}
catch(NumberFormatException ee)
{
x=0;y=0;r=0;
}
}
}
import Java.applet.*;import Java.awt.*;
public class Example12_1 extends Applet
{ public void init()
{ FlowLayout flow=new FlowLayout();
flow.setAlignment(FlowLayout.LEFT);
flow.setHgap(20);flow.setVgap(40);
setLayout(flow);
setBackground(Color.cyan);
for(int i=1;i<=12;i++)
{ add(new Button("i am "+i));
}
}
}
import Java.awt.*;import Java.applet.*;
public class Example12_2 extends Applet
{ Button button1,button2;
Label label1,label2;
TextArea text;
public void init()
{ setLayout(new BorderLayout());
text=new TextArea(10,10);
button1=new Button("东");
button2=new Button("西");
label1=new Label("上北",Label.CENTER);
label2=new Label("下南",Label.CENTER);
add(BorderLayout.NORTH,label1);
add(label2,BorderLayout.SOUTH);
add(button1,BorderLayout.EAST);
add(BorderLayout.WEST,button2);
add(BorderLayout.CENTER,text);
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
class Mycanvas extends Canvas
{ int x,y;
Mycanvas(int a,int b)
{ x=a;y=b;
setSize(100,160);
}
public void paint(Graphics g)
{ g.setColor(Color.red);
g.fillOval(50,50,4*x,4*y);//画实心椭圆
g.drawString("我是第 "+x,10,150);
}
}
public class Example12_3 extends Applet implements ActionListener
{ CardLayout mycard;
Button button1,button2,button3;
Mycanvas mycanvas[];
Panel p;
public void init()
{ setLayout(new BorderLayout()); //小容器的布局是边界布局。
mycard=new CardLayout();
p=new Panel();
p.setLayout(mycard); //p的布局设置为mycard（卡片式布局）
button1=new Button("first");
button2=new Button("next");
button3=new Button("last one");
mycanvas=new Mycanvas[21];
for(int i=1;i<=20;i++)
{ mycanvas[i]=new Mycanvas(i,i);
p.add("i am"+i,mycanvas[i]);
}
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
Panel p2=new Panel();
p2.add(button1);p2.add(button2);p2.add(button3);
add(p,BorderLayout.CENTER);add(p2,BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button1)
{ mycard.first(p);
}
else if(e.getSource()==button2)
{ mycard.next(p);
}
else if(e.getSource()==button3)
{ mycard.last(p);
}
}
}
import Java.applet.*; import Java.awt.*;
import Java.awt.event.*;
public class Example12_4 extends Applet
{ GridLayout grid;
public void init()
{ grid=new GridLayout(12,12);
setLayout(grid);
Label label[][]=new Label[12][12];
for(int i=0;i<12;i++)
{ for(int j=0;j<12;j++)
{ label[i][j]=new Label();
if((i+j)%2==0)
label[i][j].setBackground(Color.black);
else
label[i][j].setBackground(Color.white);
add(label[i][j]);
}
}
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
import Javax.swing.border.*;
public class Example12_5 extends Java.applet.Applet
{ Box baseBox ,boxH,boxV;
public void init()
{ baseBox=Box.createHorizontalBox();
boxH=Box.createHorizontalBox();
boxV=Box.createVerticalBox();
for(int i=1;i<=5;i++)
{ boxH.add(new JButton("按钮 "+i));
boxV.add(new JButton("按钮 "+i));
}
baseBox.add(boxH);baseBox.add(boxV);
add(baseBox);
}
}
import Javax.swing.*; import Java.awt.*;
import Javax.swing.border.*;
public class Example12_6 extends Java.applet.Applet
{ Box baseBox ,boxV1,boxV2;
public void init()
{ boxV1=Box.createVerticalBox();
boxV1.add(new Label("输入您的姓名"));
boxV1.add(Box.createVerticalStrut(8));
boxV1.add(new Label("输入email"));
boxV1.add(Box.createVerticalStrut(8));
boxV1.add(new Label("输入您的职业"));
boxV2=Box.createVerticalBox();
boxV2.add(new TextField(16));
boxV2.add(Box.createVerticalStrut(8));
boxV2.add(new TextField(16));
boxV2.add(Box.createVerticalStrut(8));
boxV2.add(new TextField(16));
baseBox=Box.createHorizontalBox();
baseBox.add(boxV1);
baseBox.add(Box.createHorizontalStrut(10));
aseBox.add(boxV2);
add(baseBox);
}
}
import Javax.swing.*;import Java.awt.*;
import Javax.swing.border.*;
public class Example12_7 extends Java.applet.Applet
{ Box baseBox ,boxV1,boxV2,boxV3;
public void init()
{ boxV1=Box.createVerticalBox();
for(int i=1;i<=3;i++)
{ boxV1.add(new JButton("按钮"+i));
}
boxV1.add(Box.createVerticalGlue());
boxV2=Box.createVerticalBox();
boxV2.add(Box.createVerticalGlue());
for(int i=1;i<=8;i++)
{ boxV2.add(new JButton("按钮"+i));
}
boxV3=Box.createVerticalBox();
for(int i=1;i<=6;i++)
{ boxV3.add(new JButton("按钮"+i));
if(i==3)
boxV3.add(Box.createVerticalGlue());
}
baseBox=Box.createHorizontalBox();
baseBox.add(boxV1);baseBox.add(boxV2);
baseBox.add(boxV3); add(baseBox);
}
}
import Java.applet.*;import Java.awt.*;
class Mypanel1 extends Panel
{ Checkbox box1,box2,box3;CheckboxGroup sex;
Mypanel1()
{ sex=new CheckboxGroup();
box1=new Checkbox("男",true,sex);
box2=new Checkbox("女",false,sex);
add(box1);add(box2);
}
}
class Mypanel2 extends Panel
{ Checkbox box1,box2,box3;
Mypanel2()
{ box1=new Checkbox("读书");
box2=new Checkbox("电脑");
box3=new Checkbox("电影");
add(box1);add(box2);add(box3);
}
}
public class Example13_1 extends Applet
{ Mypanel1 panel1;Mypanel2 panel2;
public void init()
{ setLayout(new GridLayout(1,2));
panel1=new Mypanel1();panel2=new Mypanel2();
add(panel1);add(panel2);
}
}
import Java.awt.*;import Java.awt.event.*;import Java.applet.*;
public class Example13_2 extends Applet implements ItemListener
{ Checkbox box1,box2,box3,box4;
TextArea text;
public void init()
{ box1=new Checkbox("→");box2=new Checkbox("↑");
box3=new Checkbox("←");box4=new Checkbox("↓");
box1.addItemListener(this);
box2.addItemListener(this);
box3.addItemListener(this);
box4.addItemListener(this);
text=new TextArea(16,18);
add(box1);add(box2);
add(box3);add(box4);
add(text);
}
public void itemStateChanged(ItemEvent e)
{ Checkbox box=(Checkbox)e.getItemSelectable(); //获取事件源。
if(box.getState())
{ int n=text.getCaretPosition(); //获取文本区活动光标位置。
text.insert(box.getLabel(),n); //插入字符。
box.setState(false);
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
import Java.util.StringTokenizer;
public class Example13_3 extends Applet implements ActionListener
{ Label 候名字=new Label("首先输入候选人的名字(人数不超过10,名字之间用逗号分隔):"),
统计选票=new Label("用下面的选择框统计选票：",Label.CENTER),
结果=new Label("选举结果:");
Button 确认=new Button("确认"),取消=new Button("取消"),
确定=new Button("确定"),刷新=new Button("刷新"),
排序=new Button("排序");
TextField name=new TextField(48); //输入候选人。
TextField voteMessage=new TextField(46); //显示选举信息。
Checkbox checkbox[]=new Checkbox[10]; //选择框数组，代表候选人。
TextField personVote[]=new TextField[10]; //文本条数组，显示每个人的得票情况。
int count[]=new int[10], //记录每个人的得票数。
totalVote=0, //总票数。
peopleNumber=0; //候选人个数。
Panel p2_1=new Panel(); //添加候选人的面板。
int 有效人数=3, //可选举的最多人数。
废票数=0,弃权票数=0;
public void init()
{ setLayout(new GridLayout(3,1));
Panel p1=new Panel(), //添加到小程序上部的面板和添加到该面板中的面板。
p1_1=new Panel(),p1_2=new Panel(),p1_3=new Panel();
p1.setLayout(new BorderLayout());
p1_1.add(候名字); p1_2.add(name);
p1_3.add(确认);p1_3.add(取消);p1_3.add(统计选票);
p1.add(p1_1,BorderLayout.NORTH);p1.add(p1_2,BorderLayout.CENTER);
p1.add(p1_3,BorderLayout.SOUTH);
Panel p2=new Panel(), //添加到小程序中间的面板p2，它里面的一个面板p2_1，
//将用来添加代表候选人的选择框。
p2_2=new Panel();
p2.setLayout(new BorderLayout());p2.setBackground(Color.cyan);
p2_1.setLayout(new GridLayout(2,5));
p2_2.add(确定); p2_2.add(刷新); p2_2.add(排序);
p2.add(p2_1,BorderLayout.CENTER);p2.add(p2_2,BorderLayout.SOUTH);
for(int i=0;i<=9;i++)
{ checkbox[i]=new Checkbox();
p2_1.add(checkbox[i]);
}
Panel p3=new Panel(), //添加到小程序底部的面板p3，及它里面的面板。
p3_1=new Panel(),p3_2=new Panel();
p3.setLayout(new BorderLayout());
p3_1.add(结果);p3_1.add(voteMessage);
p3_2.setLayout(new GridLayout(10,1));
for(int i=0;i<=9;i++)
{ personVote[i]=new TextField();
p3_2.add(personVote[i]);
}
ScrollPane scroll=new ScrollPane();
scroll.add(p3_2); //把p3_2添加到一个滚动窗体中。
p3.add(p3_1,BorderLayout.NORTH);
p3.add(scroll,BorderLayout.CENTER);
add(p1);add(p2); add(p3); //小程序添加这三个面板。
确认.addActionListener(this); 取消.addActionListener(this);
确定.addActionListener(this); 刷新.addActionListener(this);
排序.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ String s[]=new String[10];
if(e.getSource()==确认)
{ p2_1.removeAll();
String s_name=name.getText();
//提取候选人的名字，名字用逗号（英文逗号或汉文逗号）分隔:
StringTokenizer fenxi=new StringTokenizer(s_name,",，");
peopleNumber=fenxi.countTokens(); //获取候选人的个数。
int i=0;
while(fenxi.hasMoreTokens()) //用单选框代表候选人，并添加到面板p2_1。
{
s[i]=fenxi.nextToken();
p2_1.add(checkbox[i]);
checkbox[i].setLabel(s[i]);
i++;
}
for(int k=0;k<peopleNumber;k++)
{ personVote[k].setText(null);
}
}
else if(e.getSource()==取消)
{ name.setText(null);
确认.setEnabled(true);
for(int k=0;k<peopleNumber;k++)
{ personVote[k].setText(null);
}
}
else if(e.getSource()==确定) //统计候选人的得票数目。
{ totalVote=totalVote+1; //记录下统计的票数。
确认.setEnabled(false);
//检查选票是否有效：
int number=0;
for(int k=0;k<peopleNumber;k++)
{ if(checkbox[k].getState())
{ number++;
}
}
if(number>有效人数)
{ 废票数++;
for(int k=0;k<peopleNumber;k++)
{ checkbox[k].setState(false);
}
}
else if(number==0)
{ 弃权票数++;
}
else if(number>0&&number<=有效人数)
{ for(int k=0;k<peopleNumber;k++)
{ if(checkbox[k].getState())
{ count[k]=count[k]+1;
checkbox[k].setState(false);
personVote[k].setText(checkbox[k].getLabel()+
" 的得票数："+count[k]);
}
else
{ personVote[k].setText(checkbox[k].getLabel()+
" 的得票数："+count[k]);
}
}
}
voteMessage.setText("已统计了:"+totalVote+"张选票,其中弃权票:"+
弃权票数+" 作废票:"+废票数);
}
else if(e.getSource()==排序) //对选举人按得票数，从大到小排序。
{ for(int i=0;i<peopleNumber;i++)
{ for(int j=i+1;j<peopleNumber;j++)
{ if(count[j]>count[i])
{ String str_temp=personVote[i].getText();
personVote[i].setText(personVote[j].getText());
personVote[j].setText(str_temp);
int nnn=count[i];count[i]=count[j];count[j]=nnn;
}
}
}
排序.setEnabled(false);确定.setEnabled(false);
}
else if(e.getSource()==刷新)
{ totalVote=0;
voteMessage.setText("已统计了："+totalVote+"张选票");
name.setText(null);
确认.setEnabled(true); 确定.setEnabled(true); 排序.setEnabled(true);
for(int i=0;i<peopleNumber;i++)
{ count[i]=0;
personVote[i].setText(null);
p2_1.removeAll();
}
}
}
}
import Java.awt.*;import Java.awt.event.*;
public class Example13_4 extends Java.applet.Applet implements
ItemListener,ActionListener
{ Choice choice;
TextField text;
TextArea area;
Button add,del;
public void init()
{ choice=new Choice();
text=new TextField(8);
area=new TextArea(6,15);
choice.add("音乐天地");
choice.add("武术天地");
choice.add("象棋乐园");
choice.add("交友聊天");
add=new Button("添加");
del=new Button("删除");
add.addActionListener(this);del.addActionListener(this);
choice.addItemListener(this);
add(choice);
add(del);add(text);add(add);add(area);
}
public void itemStateChanged(ItemEvent e)
{ String name=choice.getSelectedItem();
int index=choice.getSelectedIndex();
area.setText("/n"+index+":"+name);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==add||e.getSource()==text)
{ String name=text.getText();
if(name.length()>0)
{ choice.add(name);
choice.select(name);
area.append("/n添加"+name);
}
}
else if(e.getSource()==del)
{ choice.remove(choice.getSelectedIndex());
area.append("/n删除"+choice.getSelectedItem());
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example13_5 extends Applet implements ItemListener,ActionListener
{ List list1,list2;
TextArea text1,text2; int index=0;
public void init()
{ list1=new List(3,false); list2=new List(3,false);
text1=new TextArea(6,15); text2=new TextArea(6,15);
list1.add("计算1+2+..."); list1.add("计算1*1+2*2+3*3...");
list1.add("计算1*1*1+2*2*2+3*3*3...");
for(int i=1;i<=100;i++)
{ list2.add("前"+i+"项和");
}
add(list1);add(list2);add(text1);add(text2);
list1.addItemListener(this); list2.addActionListener(this);
}
public void itemStateChanged(ItemEvent e)
{ if(e.getItemSelectable()==list1)
{ text1.setText(list1.getSelectedItem());
index=list1.getSelectedIndex();
}
}
public void actionPerformed(ActionEvent e)
{ int n=list2.getSelectedIndex(),sum=0;
String name=list2.getSelectedItem();
switch(index)
{ case 0:
for(int i=1;i<=n+1;i++)
{ sum=sum+i;
}
break;
case 1:
for(int i=1;i<=n+1;i++)
{ sum=sum+i*i;
}
break;
case 2:
for(int i=1;i<=n+1;i++)
{ sum=sum+i*i*i;
}
break;
default :
sum=-100;
}
text2.setText(name+"等于"+sum);
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
import Javax.swing.JTextArea;
public class Example14_1 extends Applet implements ItemListener
{ List list ;
JTextArea text;
public void init()
{ list=new List(6,false);
text=new JTextArea(6,15);text.setForeground(Color.blue);
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[]=ge.getAvailableFontFamilyNames();
for(int i=0;i<fontName.length;i++)
{ list.add(fontName[i]);
}
add(list);
Panel p=new Panel();
p.setBackground(Color.pink);
p.add(text);
add(p);
list.addItemListener(this);
}
public void itemStateChanged(ItemEvent e)
{ String name=list.getSelectedItem();
Font f=new Font(name,Font.BOLD,16);
text.setFont(f);
text.setText("/nWelcome 欢迎您");
}
}
import Java.awt.*;import Java.awt.event.*;
public class Example14_2 extends Java.applet.Applet implements ActionListener
{ Button button;
Label label;
public void init()
{ button=new Button("横向走动"); button.setBackground(Color.red);
button.addActionListener(this);
label=new Label("我可以被碰掉",Label.CENTER);
label.setBackground(Color.yellow);
add(button); add(label);
}
public void actionPerformed(ActionEvent e)
{ Rectangle rect=button.getBounds();
if(rect.intersects(label.getBounds()))
{ label.setVisible(false);
}
if(label.isVisible())
{ button.setLocation(rect.x+3,rect.y);
}
else
{ button.setLocation(rect.x,rect.y+3);
button.setLabel("纵向走动");
}
}
}
import Java.awt.*;import Java.awt.event.*;
class MyCanvas extends Canvas
{ int n=-1;
MyCanvas()
{ setSize(150,120);setBackground(Color.pink);
}
public void paint(Graphics g)
{ g.setColor(Color.red);
g.drawString("部分清除时我将消失",10,12);
g.drawString("我们正在学习repaint方法",10,80);
}
public void setN(int n)
{ this.n=n;
}
public void update(Graphics g)
{ int width=0, height=0;
width=getSize().width;height=getSize().height;
if(n==0)
{ g.clearRect(0,0,width,height);
//paint(g); //如果取消该注释，update的功能就与父类相同。
}
else if(n==1)
{ g.clearRect(2,2,width,40);
}
}
}
public class Example14_3 extends Java.applet.Applet implements ActionListener
{ Button b1,b2;MyCanvas canvas;
public void init()
{ canvas=new MyCanvas();
b1=new Button("全部清除"); b1.addActionListener(this);
b2=new Button("部分清除"); b2.addActionListener(this);
add(b1); add(b2); add(canvas);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==b1)
{ canvas.setN(0);canvas.repaint();
}
if(e.getSource()==b2)
{ canvas.setN(1);canvas.repaint();
}
}
}
import Java.awt.*;import Java.awt.event.*;
class MyFrame extends Frame implements ItemListener,ActionListener
{ Checkbox box; TextArea text; Button button;
MyFrame(String s)
{ super(s);
box=new Checkbox("设置窗口是否可调整大小");
text=new TextArea(12,12);
button=new Button("关闭窗口");
button.addActionListener(this);
box.addItemListener(this);
setBounds(100,100,200,300);
setVisible(true);
add(text,BorderLayout.CENTER);
add(box,BorderLayout.SOUTH);
add(button,BorderLayout.NORTH);
setResizable(false);
validate();
}
public void itemStateChanged(ItemEvent e)
{ if(box.getState()==true)
{ setResizable(true);
}
else
{ setResizable(false);
}
}
public void actionPerformed(ActionEvent e)
{ dispose();
}
}
class Example15_1
{ public static void main(String args[])
{ new MyFrame("窗口");
}
}
import Java.awt.*;import Java.awt.event.*;
class MyFrame extends Frame implements ItemListener,ActionListener
{ Checkbox box; Button button;
Toolkit tool; Dimension dim;
MyFrame(String s)
{ super(s);
box=new Checkbox("设置窗口和屏幕同样大小");
add(box,BorderLayout.SOUTH);
button=new Button("关闭窗口"); button.addActionListener(this);
box.addItemListener(this);
setBounds(100,100,200,300); setVisible(true);
add(box,BorderLayout.SOUTH); add(button,BorderLayout.NORTH);
tool=getToolkit();
validate();
}
public void itemStateChanged(ItemEvent e)
{ if(box.getState()==true)
{ dim=tool.getScreenSize();
setBounds(0,0,dim.width,dim.height);
validate();
}
else
{ setBounds(0,0,dim.width,80);
validate();
}
}
public void actionPerformed(ActionEvent e)
{ dispose();
}
}
class Example15_2
{ public static void main(String args[])
{new MyFrame("窗口");
}
}
import Java.awt.*;import Java.awt.event.*;
class 圆 extends Panel implements ActionListener//负责计算圆面积的类。
{ double r,area;
TextField 半径=null,
结果=null;
Button b=null;
圆()
{ 半径=new TextField(10);
结果=new TextField(10);
b=new Button("确定");
add(new Label("输入半径"));
add(半径);
add(new Label("面积是:"));
add(结果); add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ try
{ r=Double.parseDouble(半径.getText());
area=Math.PI*r*r;
结果.setText(""+area);
}
catch(Exception ee)
{ 半径.setText("请输入数字字符");
}
}
}
class 三角形 extends Panel implements ActionListener//负责计算三角形面积的类。
{ double a=0,b=0,c=0,area;
TextField 边_a=new TextField(6),
边_b=new TextField(6),
边_c=new TextField(6),
结果=new TextField(24);
Button button=new Button("确定");
三角形()
{ add(new Label("输入三边的长度:"));
add(边_a); add(边_b); add(边_c);
add(new Label("面积是:"));
add(结果); add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)//获取三边的长度。
{ try{ a=Double.parseDouble(边_a.getText());
b=Double.parseDouble(边_b.getText());
c=Double.parseDouble(边_c.getText());
if(a+b>c&&a+c>b&&c+b>a)
{ double p=(a+b+c)/2;
area=Math.sqrt(p*(p-a)*(p-b)*(p-c));//计算三角形的面积。
结果.setText(""+area);
}
else
{ 结果.setText("您输入的数字不能形成三角形");
}
}
catch(Exception ee)
{ 结果.setText("请输入数字字符");
}
}
}
class Win extends Frame implements ActionListener
{ MenuBar bar=null; Menu menu=null;
MenuItem item1, item2;
圆 circle ;
三角形 trangle;
Win()
{ bar=new MenuBar(); menu=new Menu("选择");
item1=new MenuItem("圆面积计算"); item2=new MenuItem("三角形面积计算");
menu.add(item1); menu.add(item2);
bar.add(menu);
setMenuBar(bar);
circle=new 圆();
trangle=new 三角形(); //创建一个圆和一个三角形。
item1.addActionListener(this); item2.addActionListener(this);
setVisible(true); setBounds(100,120,100,90);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==item1)
{ removeAll();
add(circle,"Center");//添加圆面积计算的界面。
validate();
}
else if(e.getSource()==item2)
{ removeAll();
add(trangle,"Center");//添加三角形面积计算的界面。
validate();
}
}
}
public class Example15_3
{ public static void main(String args[])
{ Win win=new Win();win.setBounds(100,100,200,100);win.setVisible(true);
win.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
}
import Java.awt.*;import Java.awt.event.*;
class Herwindow extends Frame implements ActionListener
{ MenuBar menubar;Menu menu;MenuItem item;
MenuShortcut shortcut=new MenuShortcut(KeyEvent.VK_E);
Herwindow(String s)
{ super(s);
setSize(160,170);setVisible(true);
menubar=new MenuBar(); menu=new Menu("文件");
item=new MenuItem("退出");
item.setShortcut(shortcut); //设置菜单选项的键盘快捷键。
item.addActionListener(this);
menu.add(item);
menubar.add(menu);menubar.add(menu);
setMenuBar(menubar);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==item)
{ System.exit(0);
}
}
}
public class Example15_4
{ public static void main(String args[])
{ Herwindow window=new Herwindow("法制之窗");
}
}
import Java.awt.*;import Java.awt.event.*;
class MyFrame extends Frame implements WindowListener
{ TextArea text;
MyFrame(String s)
{ super(s);
setBounds(100,100,200,300);
setVisible(true);
text=new TextArea();
add(text,BorderLayout.CENTER);
addWindowListener(this);
validate();
}
public void windowActivated(WindowEvent e)
{ text.append("/n我被激活");
validate();
}
public void windowDeactivated(WindowEvent e)
{ text.append("/n我不是激活状态了");
setBounds(0,0,400,400); validate();
}
public void windowClosing(WindowEvent e)
{ text.append("/n窗口正在关闭呢"); dispose();
}
public void windowClosed(WindowEvent e)
{ System.out.println("程序结束运行");
System.exit(0);
}
public void windowIconified(WindowEvent e)
{ text.append("/n我图标化了");
}
public void windowDeiconified(WindowEvent e)
{ text.append("/n我撤消图标化");
setBounds(0,0,400,400);validate();
}
public void windowOpened(WindowEvent e){ }
}
class Example15_5
{ ublic static void main(String args[])
{ new MyFrame("窗口");
}
}
import Java.awt.*;import Java.awt.event.*;
class MyFrame extends Frame
{ TextArea text; Boy police;
MyFrame(String s)
{ super(s);
police=new Boy(this);
setBounds(100,100,200,300); setVisible(true);
text=new TextArea(); add(text,BorderLayout.CENTER);
addWindowListener(police); validate();
}
}
class Boy extends WindowAdapter
{ MyFrame f;
public Boy(MyFrame f)
{ this.f=f;
}
public void windowActivated(WindowEvent e)
{ f.text.append("/n我被激活");
}
public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
class Example15_6
{ public static void main(String args[])
{ new MyFrame("窗口");
}
}
import Java.awt.*;import Java.awt.event.*;
class MyFrame extends Frame
{ TextArea text;
MyFrame(String s)
{ super(s);
setBounds(100,100,200,300);setVisible(true);
text=new TextArea(); add(text,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{ public void windowActivated(WindowEvent e)
{ text.append("/n我被激活");
}
public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
validate();
}
}
class Example15_7
{ public static void main(String args[])
{ new MyFrame("窗口");
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example15_8 extends Applet
{ Frame f,g;
public void init()
{ f=new Frame("音乐之窗");g=new Frame("体育之窗");
f.setSize(150,150); f.setVisible(true);
g.setSize(200,200); g.setVisible(false);
f.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ f.setVisible(false);
g.setVisible(true);
}
} ); //适配器
g.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ g.setVisible(false);
f.setVisible(true);
}
} );
}
}
import Java.awt.*;import Java.awt.event.*;
public class Example15_9
{ public static void main(String args[])
{ MyFrame f=new MyFrame();
f.setBounds(70,70,70,89);f.setVisible(true);f.pack();
}
}
class MyFrame extends Frame implements ActionListener
{ PrintJob p=null; //声明一个PrintJob对象。
Graphics g=null;
TextArea text=new TextArea(10,10);
Button 打印文本框=new Button("打印文本框"),
打印窗口=new Button("打印窗口"),
打印按扭=new Button("打印按扭");
MyFrame()
{ super("在应用程序中打印");
打印文本框.addActionListener(this);
打印窗口.addActionListener(this);
打印按扭.addActionListener(this);
add(text,"Center");
Panel panel=new Panel();
panel.add(打印文本框); panel.add(打印窗口); panel.add(打印按扭);
add(panel,"South");
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0); }
});
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==打印文本框)
{ p=getToolkit().getPrintJob(this,"ok",null);
//创建一个PrintJob对象p 。
g=p.getGraphics(); //p获取一个用于打印的 Graphics对象。
g.translate(120,200);
text.printAll(g);
g.dispose(); //释放对象 g。
p.end();
}
else if(e.getSource()==打印窗口)
{ p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics(); //p获取一个用于打印的 Graphics对象。
g.translate(120,200);
this.printAll(g); //打印当前窗口及其子组件。
g.dispose(); //释放对象 g。
p.end();
}
else if(e.getSource()==打印按扭)
{ p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200); //在打印页的坐标(120,200)处打印第一个“按扭”。
打印文本框.printAll(g);
g.translate(78,0); //在打印页的坐标(198,200)处打印第二个“按扭”。
打印窗口.printAll(g);
g.translate(66,0); //在打印页的坐标(264,200)处打印第三个“按扭”。
打印按扭.printAll(g);
g.dispose();
p.end();
}
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.awt.datatransfer.*;
public class Example15_10 extends Frame implements ActionListener
{ MenuBar menubar; Menu menu;
MenuItem copy,cut,paste;
TextArea text1,text2;
Clipboard clipboard=null;
Example15_10()
{ clipboard=getToolkit().getSystemClipboard();//获取系统剪贴板。
menubar=new MenuBar();
menu=new Menu("Edit"); copy=new MenuItem("copy");
cut=new MenuItem ("cut"); paste=new MenuItem ("paste");
text1=new TextArea(20,20); text2=new TextArea(20,20);
copy.addActionListener(this); cut.addActionListener(this);
paste.addActionListener(this);
setLayout(new FlowLayout());
menubar.add(menu);
menu.add(copy); menu.add(cut); menu.add(paste);
setMenuBar(menubar);
add(text1);add(text2);
setBounds(100,100,200,250); setVisible(true);pack();
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);
}
}) ;
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==copy) //拷贝到剪贴板。
{ String temp=text1.getSelectedText(); //拖动鼠标选取文本。
StringSelection text=new StringSelection(temp);
clipboard.setContents(text,null);
}
else if(e.getSource()==cut) //剪贴到剪贴板。
{ String temp=text1.getSelectedText(); //拖动鼠标选取文本。
StringSelection text=new StringSelection(temp);
clipboard.setContents(text,null);
int start=text1.getSelectionStart();
int end =text1.getSelectionEnd();
text1.replaceRange("",start,end) ; //从Text1中删除被选取的文本。
}
else if(e.getSource()==paste) //从剪贴板粘贴数据。
{ Transferable contents=clipboard.getContents(this);
DataFlavor flavor= DataFlavor.stringFlavor;
if( contents.isDataFlavorSupported(flavor))
try{ String str;
str=(String)contents.getTransferData(flavor);
text2.append(str);
}
catch(Exception ee){}
}
}
public static void main(String args[])
{ Example15_10 win=new Example15_10 ();
}
}
import Java.awt.event.*; import Java.awt.*;
class MyDialog extends Dialog implements ActionListener //建立对话框类。
{ static final int YES=1,NO=0;
int message=-1; Button yes,no;
MyDialog(Frame f,String s,boolean b) //构造方法。
{ super(f,s,b);
yes=new Button("Yes"); yes.addActionListener(this);
no=new Button("No"); no.addActionListener(this);
setLayout(new FlowLayout());
add(yes); add(no);
setBounds(60,60,100,100);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ message=-1;setVisible(false);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==yes)
{ message=YES;setVisible(false);
}
else if(e.getSource()==no)
{ message=NO;setVisible(false);
}
}
public int getMessage()
{ return message;
}
}
class Dwindow extends Frame implements ActionListener
{ TextArea text; Button button; MyDialog dialog;
Dwindow(String s)
{ super(s);
text=new TextArea(5,22); button=new Button("打开对话框");
button.addActionListener(this);
setLayout(new FlowLayout());
add(button); add(text);
dialog=new MyDialog(this,"我有模式",true);
setBounds(60,60,300,300); setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button)
{ dialog.setVisible(true); //对话框激活状态时,堵塞下面的语句。
//对话框消失后下面的语句继续执行：
if(dialog.getMessage()==MyDialog.YES) //如果单击了对话框的"yes"按钮。
{ text.append("/n你单击了对话框的yes按钮");
}
else if(dialog.getMessage()==MyDialog.NO) //如果单击了对话框的"no"按钮。
{ text.append("/n你单击了对话框的No按钮");
}
}
}
}
public class Example16_1
{ public static void main(String args[])
{ new Dwindow("带对话框的窗口");
}
}
import Java.awt.*;import Java.awt.event.*;
public class Example16_2
{ public static void main(String args[])
{ FWindow f=new FWindow("窗口");
}
}
class FWindow extends Frame implements ActionListener
{ FileDialog filedialog_save,
filedialog_load;//声明2个文件对话筐
MenuBar menubar;
Menu menu;
MenuItem itemSave,itemLoad;
TextArea text;
FWindow(String s)
{ super(s);
setSize(300,400);setVisible(true);
text=new TextArea(10,10);
add(text,"Center"); validate();
menubar=new MenuBar();menu=new Menu("文件");
itemSave=new MenuItem("保存文件"); itemLoad=new MenuItem("打开文件");
itemSave.addActionListener(this); itemLoad.addActionListener(this);
menu.add(itemSave); menu.add(itemLoad);
menubar.add(menu);
setMenuBar(menubar);
filedialog_save=new FileDialog(this,"保存文件话框",FileDialog.SAVE);
filedialog_save.setVisible(false);
filedialog_load=new FileDialog(this,"打开文件话框",FileDialog.LOAD);
filedialog_load.setVisible(false);
filedialog_save.addWindowListener(new WindowAdapter()//对话框增加适配器。
{ public void windowClosing(WindowEvent e)
{ filedialog_save.setVisible(false);
}
});
filedialog_load.addWindowListener(new WindowAdapter()//对话框增加适配器。
{public void windowClosing(WindowEvent e)
{ filedialog_load.setVisible(false);
}
});
addWindowListener(new WindowAdapter() //窗口增加适配器。
{public void windowClosing(WindowEvent e)
{ setVisible(false);System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) //实现接口中的方法。
{ if(e.getSource()==itemSave)
{ filedialog_save.setVisible(true);
String name=filedialog_save.getFile();
if(name!=null)
{ text.setText("你选择了保存文件,名字是"+name);
}
else
{ text.setText("没有保存文件");
}
}
else if(e.getSource()==itemLoad)
{ filedialog_load.setVisible(true);
String name=filedialog_load.getFile();
if(name!=null)
{ text.setText("你选择了打开文件,名字是"+name);
}
else
{ text.setText("没有打开文件");
}
}
}
}
import Java.awt.event.*;import Java.awt.*;
import Javax.swing.JOptionPane;
class Dwindow extends Frame implements ActionListener
{ TextField inputNumber;
TextArea show;
Dwindow(String s)
{ super(s);
inputNumber=new TextField(22); inputNumber.addActionListener(this);
show=new TextArea();
add(inputNumber,BorderLayout.NORTH); add(show,BorderLayout.CENTER);
setBounds(60,60,300,300); setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ boolean boo=false;
if(e.getSource()==inputNumber)
{ String s=inputNumber.getText();
char a[]=s.toCharArray();
for(int i=0;i<a.length;i++)
{ if(!(Character.isDigit(a[i])))
boo=true;
}
if(boo==true) //弹出“警告”消息对话框。
{ JOptionPane.showMessageDialog(this,"您输入了非法字符","警告对话框",
JOptionPane.WARNING_MESSAGE);
inputNumber.setText(null);
}
else if(boo==false)
{ int number=Integer.parseInt(s);
show.append("/n"+number+"平方:"+(number*number));
}
}
}
}
public class Example16_3
{ public static void main(String args[])
{ new Dwindow("带对话框的窗口");
}
}
import Java.awt.event.*;import Java.awt.*;
import Javax.swing.JOptionPane;
class Dwindow extends Frame implements ActionListener
{ TextField inputName;
TextArea save;
Dwindow(String s)
{ super(s);
inputName=new TextField(22);inputName.addActionListener(this);
save=new TextArea();
add(inputName,BorderLayout.NORTH); add(save,BorderLayout.CENTER);
setBounds(60,60,300,300); setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{ String s=inputName.getText();
int n=JOptionPane.showConfirmDialog(this,"确认正确吗？","确认对话框",
JOptionPane.YES_NO_OPTION );
if(n==JOptionPane.YES_OPTION)
{ save.append("/n"+s);
}
else if(n==JOptionPane.NO_OPTION)
{ inputName.setText(null);
}
}
}
public class Example16_4
{ public static void main(String args[])
{ new Dwindow("带对话框的窗口");
}
}
import Java.awt.event.*;
import Java.awt.*;
import Javax.swing.JColorChooser;
class Dwindow extends Frame implements ActionListener
{ Button button;
Dwindow(String s)
{ super(s);
button=new Button("打开颜色对话框");
button.addActionListener(this);
setLayout(new FlowLayout());
add(button);
setBounds(60,60,300,300);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
public void actionPerformed(ActionEvent e)
{
Color newColor=JColorChooser.showDialog(this,"调色板",button.getBackground());
button.setBackground(newColor);
}
}
public class Example16_5
{ public static void main(String args[])
{
new Dwindow("带颜色对话框的窗口");
}
}
import Java.applet.*;import Java.awt.*;
public class Example17_1 extends Applet
{ public void paint(Graphics g)
{ int y,x=120;
g.drawString("计算机科学技术",10,20);
g.drawString("I Love This Game",20,40);
char a[]="中国科学技术大学".toCharArray();
for(int i=0;i<a.length;i++)
{ y=2*x-200;
g.drawChars(a,i,1,x,y);
x=x+6;
}
}
}
import Java.applet.*;import Java.awt.*;
public class Example17_2 extends Applet
{ public void paint(Graphics g)
{ int gap=0;
for(int i=1;i<=10;i++)
{ g.drawLine(10,10+5*i,180,10+5*i);
}
for(int i=1;i<=8;i++)
{ g.drawLine(40+3*i,70,40+3*i,150);
}
g.drawLine(64,70,150,156);
}
}
import Java.applet.*;import Java.awt.*;
public class Example17_3 extends Applet
{ public void paint(Graphics g)
{g.drawRect(24,22,60,34);
g.drawRoundRect(10,10,90,60,50,30);
g.setColor(Color.cyan);
g.fillOval(10,80,120,60);
int k=0;
for(int i=1;i<=8;i++)
{ Color c=new Color(i*32-1,0,0);
g.setColor(c); k=k+5;
g.drawOval(160+k,77+k,120-2*k,80-2*k);
}
}
}
import Java.applet.*;import Java.awt.*;
public class Example17_4 extends Applet
{ public void paint(Graphics g)
{ g.drawArc(0,40,100,50,0,180);
g.drawArc(100,40,100,50,180,180);
g.setColor(Color.blue);
g.fillArc(0,100,40,40,0,270);
g.setColor(Color.green);
g.drawArc(55,120,120,60,-90,270);
}
}
import Java.applet.*;
import Java.awt.*;
public class Example17_5 extends Applet
{ int px1[]={40,80,0,40};
int py1[]={5, 45,45,5};
int px2[]={140,180,180,140,100,100,};
int py2[]={5, 25, 45, 65, 45, 25,};
public void paint(Graphics g)
{ g.drawPolygon(px1,py1,4);//从点(40,5)画到点(80,45),再从点(80,45)画到点(0,45)。
g.drawPolygon(px2,py2,6);
}
}
import Java.applet.*; import Java.awt.*;
public class Example17_6 extends Applet
{ Font f1=new Font("Helvetica",Font.PLAIN,28);
Font f2=new Font("Helvetica",Font.BOLD,15);
Font f3=new Font("Courier",Font.PLAIN,12);
Font f4=
new Font("TimesRoman",Font.BOLD+Font.ITALIC,18);
public void paint(Graphics g)
{ g.setFont(f1);
g.drawString("28pt plain Helvetica",5,20);
g.setFont(f2);
g.drawString("15pt bold Helvetica",5,43);
g.setFont(f3);
g.drawString("12pt plain courier",5,75);
g.setFont(f4);
g.drawString("18pt bold & italic Times Roman",5,92);
}
}
import Java.applet.*;import Java.awt.*;
public class Example17_7 extends Applet
{ public void init()
{ setBackground(Color.yellow);
}
public void paint(Graphics g)
{ g.setColor(Color.red);
g.fillOval(10,10,100,100);
g.clearRect(40,40,40,40);
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example17_8 extends Applet
{ int i=0;
public void paint(Graphics g)
{ i=(i+2)%360;
Color c=new Color((3*i)%255,(7*i)%255,(11*i)%255);
g.setColor(c); g.fillArc(30,50,120,100,i,2);
g.fillArc(30,152,120,100,i,2);
try{ //程序暂停300毫秒，再执行repaint()(见19章):
Thread.sleep(300);
}
catch(InterruptedException e){}
repaint();
}
public void update(Graphics g)
{ g.clearRect(30,152,120,100);
paint(g);
}
}
import Java.awt.*; import Java.applet.*;
import Java.awt.geom.*;
public class Example17_9 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.red);
Graphics2D g_2d=(Graphics2D)g;
Line2D line=new Line2D.Double(2,2,300,300);
g_2d.draw(line);
for(int i=1,k=1;i<=10;i++)
{ line.setLine(10,10+k,80,10+k);
g_2d.draw(line); k=k+3;
}
}
}
import Java.awt.*; import Java.applet.*;
import Java.awt.geom.*;
public class Example17_10 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.blue) ;
Graphics2D g_2d=(Graphics2D)g;
Rectangle2D rect=
new Rectangle2D. Double (20,30,30,30);
g_2d.draw(rect);
for(int i=1;i<=5;i++)
{ rect.setRect(12,12+i,50,80);
g_2d.draw(rect);
}
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_11 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.blue) ;
Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse=
new Ellipse2D. Double (20,30,100,50);
g_2d.draw(ellipse);
for(int i=1,k=0;i<=6;i++)
{ ellipse.setFrame(20+k,30,100-2*k,50);
g_2d.draw(ellipse); k=k+5;
}
}
}
import Java.awt.*; import Java.applet.*;
import Java.awt.geom.*;
public class Example17_12 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.red) ;
Graphics2D g_2d=(Graphics2D)g;
Arc2D arc=
new Arc2D.Double (2,30,80,55,180,-90,Arc2D.OPEN);
g_2d.draw(arc);
arc.setArc(90,30,90,70,0,180,Arc2D.CHORD);
g_2d.draw(arc);
arc.setArc(190,30,50,90,0,270,Arc2D.PIE);
g_2d.draw(arc);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_13 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.red) ;
Graphics2D g_2d=(Graphics2D)g;
QuadCurve2D quadCurve=
new QuadCurve2D.Double(2,10,51,90,100,10);
g_2d.draw(quadCurve);
quadCurve.setCurve(2,100,51,10,100,100);
g_2d.draw(quadCurve);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_14 extends Applet
{ public void paint(Graphics g)
{ g.setColor(Color.red) ;
Graphics2D g_2d=(Graphics2D)g;
CubicCurve2D curve_1=new CubicCurve2D.Double(2,30,80,55,10,10,20,90);
CubicCurve2D curve_2=new CubicCurve2D.Double(2,30,5,67,20,30,20,90);
CubicCurve2D curve_3=new CubicCurve2D.Double(30,35,54,67,20,90,100,190);
g_2d.draw(curve_1);g_2d.draw(curve_2);g_2d.draw(curve_3);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_15 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
BasicStroke bs_1
=new BasicStroke(16,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
BasicStroke bs_2
=new BasicStroke(16f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_MITER);
BasicStroke bs_3
=new BasicStroke(16f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_ROUND);
Line2D line_1=new Line2D.Double(20,20,100,20);
Line2D line_2=new Line2D.Double(20,50,100,50);
Line2D line_3=new Line2D.Double(20,80,100,80);
g_2d.setStroke(bs_1); //设置线条。
g_2d.draw(line_1);
g_2d.setStroke(bs_2); g_2d.draw(line_2);
g_2d.setStroke(bs_3); g_2d.draw(line_3);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_16 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
g_2d.setColor(Color.cyan);
Rectangle2D rect=new Rectangle2D.Double(0,0,200,200);
g_2d.fill(rect);
Arc2D arc1=new Arc2D.Double(0,0,200,200,0,180,Arc2D.CHORD),
arc2=new Arc2D.Double(0,0,200,200,0,-180,Arc2D.CHORD);
RoundRectangle2D roundR1=new RoundRectangle2D.Double
(0,50,100,100,100,100),
roundR2=new RoundRectangle2D.Double
(100,50,100,100,100,100),
roundR3=new RoundRectangle2D.Double
(37.5,87.8,25,25,25,25),
roundR4=new RoundRectangle2D.Double
(137.5,87.8,25,25,25,25);
g_2d.setColor(Color.white); g_2d.fill(arc1);
g_2d.setColor(Color.black); g_2d.fill(arc2);
g_2d.fill(roundR1);
g_2d.setColor(Color.white);
g_2d.fill(roundR2); g_2d.fill(roundR3);
g_2d.setColor(Color.black);
g_2d.fill(roundR4);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_17 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
GradientPaint gradient_1
=new GradientPaint(0,0,Color.red,50,50,Color.green,false);
g_2d.setPaint(gradient_1);
Rectangle2D rect_1=new Rectangle2D.Double (0,0,50,50);
g_2d.fill(rect_1);
GradientPaint gradient_2
=new GradientPaint(60,50,Color.white,150,50,Color.red,false);
g_2d.setPaint(gradient_2);
Rectangle2D rect_2=new Rectangle2D.Double (60,50,90,50);
g_2d.fill(rect_2);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_18 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse=
new Ellipse2D. Double (20,50,120,50);
g_2d.setColor(Color.blue);
AffineTransform trans=new AffineTransform();
for(int i=1;i<=24;i++)
{ trans.rotate(15.0*Math.PI/180,80,75);
g_2d.setTransform(trans);
//现在画的就是旋转后的椭圆样子：
g_2d.draw(ellipse);
}
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.awt.geom.*;
import Java.applet.*;
public class Flower extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
//花叶两边的曲线:
QuadCurve2D
curve_1=new QuadCurve2D.Double(200,200,150,160,200,100);
CubicCurve2D curve_2=
new CubicCurve2D.Double(200,200,260,145,190,120,200,100);
//花叶中的纹线:
Line2D line=new Line2D.Double(200,200,200,110);
QuadCurve2D leaf_line1=
new QuadCurve2D.Double(200,180,195,175,190,170);
QuadCurve2D leaf_line2=
new QuadCurve2D.Double(200,180,210,175,220,170);
QuadCurve2D leaf_line3=
new QuadCurve2D.Double(200,160,195,155,190,150);
QuadCurve2D leaf_line4=
new QuadCurve2D.Double(200,160,214,155,220,150);
//利用旋转来绘制花朵:
AffineTransform trans=new AffineTransform();
for(int i=0;i<6;i++)
{ trans.rotate(60*Math.PI/180,200,200);
g_2d.setTransform(trans);
GradientPaint gradient_1=
new GradientPaint(200,200,Color.green,200,100,Color.yellow);
g_2d.setPaint(gradient_1);
g_2d.fill(curve_1);
GradientPaint gradient_2=new
GradientPaint(200,145,Color.green,260,145,Color.red,true);
g_2d.setPaint(gradient_2);
g_2d.fill(curve_2);
Color c3=new Color(0,200,0); g_2d.setColor(c3);
g_2d.draw(line);
g_2d.draw(leaf_line1); g_2d.draw(leaf_line2);
g_2d.draw(leaf_line3); g_2d.draw(leaf_line4);
}
//花瓣中间的花蕾曲线:
QuadCurve2D center_curve_1=
new QuadCurve2D.Double(200,200,190,185,200,180);
AffineTransform trans_1=new AffineTransform();
for(int i=0;i<12;i++)
{ trans_1.rotate(30*Math.PI/180,200,200);
g_2d.setTransform(trans_1);
GradientPaint gradient_3=
new GradientPaint(200,200,Color.red,200,180,Color.yellow);
g_2d.setPaint(gradient_3);
g_2d.fill(center_curve_1);
}
//再绘制一个0.4倍的花朵:
AffineTransform trans_2=new AffineTransform();
trans_2.scale(0.4,0.4);
for(int i=0;i<6;i++)
{ trans_2.rotate(60*Math.PI/180,200,200);
g_2d.setTransform(trans_2);g_2d.setColor(Color.pink);
g_2d.fill(curve_1);g_2d.setColor(Color.green);
g_2d.fill(curve_2);
}
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_20 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse1=
new Ellipse2D. Double (20,50,120,120);
Ellipse2D ellipse2=
new Ellipse2D. Double (80,50,120,120);
Area a1=new Area(ellipse1); Area a2=new Area(ellipse2);
a1.intersect(a2); //"与"
g_2d.fill(a1);
ellipse1.setFrame(150,50,120,120); ellipse2.setFrame(260,50,50,100);
a1=new Area(ellipse1); a2=new Area(ellipse2);
a1.add(a2); //"或"
g_2d.fill(a1);
ellipse1.setFrame(20,170,120,120);ellipse2.setFrame(80,170,160,160);
a1=new Area(ellipse1); a2=new Area(ellipse2);
a1.subtract(a2); //"差"
g_2d.fill(a1);
ellipse1.setFrame(150,170,120,120); ellipse2.setFrame(260,170,50,100);
a1=new Area(ellipse1); a2=new Area(ellipse2);
a1.exclusiveOr(a2); //"异或"
g_2d.fill(a1);
}
}
import Java.awt.*;import Java.applet.*;
import Java.awt.geom.*;
public class Example17_21 extends Applet
{ public void paint(Graphics g)
{ Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse1=
new Ellipse2D. Double (20,80,60,60),
ellipse2=
new Ellipse2D. Double (40,80,80,80);
g_2d.setColor(Color.blue);
Area a1=new Area(ellipse1),
a2=new Area(ellipse2);
a1.subtract(a2); //"差"
AffineTransform trans=new AffineTransform();
for(int i=1;i<=10;i++)
{ trans.rotate(36.0*Math.PI/180,80,75);
g_2d.setTransform(trans);
g_2d.fill(a1);
}
}
}
import Java.awt.*;import Java.applet.*;
public class PaintTest extends Applet
{ public void init()
{ setBackground(Color.yellow);
}
public void paint(Graphics g)
{ g.setXORMode(Color.red);//设置XOR绘图模式。
g.setColor(Color.green);
g.fillRect(20,20,80,40);//矩形的实际颜色是green+yellow的混合色：灰色。
g.setColor(Color.yellow);
g.fillRect(60,20,80,40);//该矩形的前一半是yellow+yellow+灰色=red+灰色，
//后一半是红色。
g.setColor(Color.green);
g.fillRect(20,70,80,40);//矩形的实际颜色是green+yellow的混合色：灰色。
g.fillRect(60,70,80,40);// 该矩形的前一半是green+yellow+灰色=背景色，
// 后一半是green+yellow：灰色。
g.setColor(Color.green);
g.drawLine(100,100,200,200);//该直线是green+yellow：灰色。
//下面，在同一位置再绘制该直线，因此，该直线前半段是green+yellow+灰色=
//灰色+灰色=背景色,该直线后半段是green+yellow=灰色： g.drawLine(100,100,220,220);
//仔细分析下列直线颜色的变化:
g.setColor(Color.yellow);
g.drawLine(20,30,160,30); g.drawLine(20,75,160,75);
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.awt.geom.*;
public class Example17_23
{ public static void main(String args[])
{ Frame f=new Frame();
f.setSize(70,70); f.setVisible(true);
Mycanvas canvas=new Mycanvas();
f.add(canvas,"Center");f.pack();
f.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
PrintJob p=f.getToolkit().getPrintJob(f,"ok",null);
Graphics g=p.getGraphics();
g.drawRect(30,30,40,40);
g.dispose();
p.end();
}
}
class Mycanvas extends Canvas
{ Mycanvas()
{ setSize(200,200);
}
public void paint(Graphics g)
{ g.drawRect(30,30,40,40);
}
}
第十八章 Java中的鼠标事件和键盘事件
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example18_1 extends Applet implements MouseListener
{ TextField text;
public void init()
{ text=new TextField(40); add(text);
addMouseListener(this) ;//向小程序增加鼠标事件监视器。
}
public void mousePressed(MouseEvent e)
{ text.setText("鼠标键按下了,位置是"+e.getX()+","+e.getY() );
}
public void mouseReleased(MouseEvent e)
{ text.setText(" 鼠标松开了,位置是"+e.getX()+","+e.getY() );
}
public void mouseEntered(MouseEvent e)
{ text.setText(" 鼠标进来了,位置是"+e.getX()+","+e.getY() );
}
public void mouseExited(MouseEvent e)
{ text.setText(" 鼠标走开了");
}
public void mouseClicked(MouseEvent e)
{ if(e.getClickCount()==2)
{ text.setText("鼠标键双击,位置:"+e.getX()+","+e.getY());
}
else {}
}
}
import Java.awt.*;import Java.awt.event.*;
class MyCanvas extends Canvas implements MouseListener
{ int left=-1,right=-1; //记录左、右键用的变量。
int x=-1,y=-1; //记录鼠标位置用的变量。
MyCanvas()
{ setSize(100,100);
setBackground(Color.cyan) ;
addMouseListener(this);
}
public void paint(Graphics g)
{ if(left==1)
{ g.drawOval(x-10,y-10,20,20);
}
else if(right==1)
{ g.drawRect(x-8,y-8,16,16);
}
}
public void mousePressed(MouseEvent e)
{ x=e.getX(); y=e.getY();
if(e.getModifiers()==InputEvent.BUTTON1_MASK)
{ left=1;right=-1;
repaint();
}
else if(e.getModifiers()==InputEvent.BUTTON3_MASK)
{ right=1; left=-1;
repaint();
}
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e)
{ left=-1;right=-1;
repaint();
}
public void mouseClicked(MouseEvent e){}
public void update(Graphics g)
{ if(left==1||right==1)
{ paint(g);
}
else
{ super.update(g);
}
}
}
public class Example18_2
{ public static void main(String args[])
{ Frame f=new Frame();
f.setBounds(100,100,200,200);f.setVisible(true);
f.addWindowListener(new WindowAdapter() //适配器
{public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
f.add(new MyCanvas(),BorderLayout.CENTER);//添加画布。
f.validate();
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.applet.*;
public class Example18_3 extends Applet implements MouseListener
{ TextField text; Button button;
TextArea textArea;
public void init()
{ text=new TextField(10); text.addMouseListener(this);
button=new Button("按钮"); button.addMouseListener(this);
addMouseListener(this);
textArea=new TextArea(8,28);
add(button);add(text);add(textArea);
}
public void mousePressed(MouseEvent e)
{ if(e.getSource()==button)
{textArea.append("/n在按钮上鼠标按下,位置:"+"("+e.getX()+","+e.getY()+")");
}
else if(e.getSource()==text)
{textArea.append("/n在文本框上鼠标按下,位置:"+"("+e.getX()+","+e.getY()+")");
}
else if(e.getSource()==this)
{textArea.append("/n在容器上鼠标按下,位置:"+"("+e.getX()+","+e.getY()+")");
}
}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e)
{ if(e.getClickCount()>=2)
textArea.setText("鼠标连击，位置:"+"("+e.getX()+","+e.getY()+")");
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example18_4 extends Applet implements MouseMotionListener
{ int x=-1,y=-1;
public void init()
{ setBackground(Color.green);
addMouseMotionListener(this);
}
public void paint(Graphics g)
{ if(x!=-1&&y!=-1)
{ g.setColor(Color.red);
g.drawLine(x,y,x,y);
}
}
public void mouseDragged(MouseEvent e)
{ x=(int)e.getX();y=(int)e.getY();
repaint();
}
public void mouseMoved(MouseEvent e){}
public void update(Graphics g)
{ paint(g);
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example18_5 extends Applet
implements ActionListener,MouseMotionListener
{ int x=-1,y=-1,橡皮擦通知=0,清除通知=0;
Color c=new Color(255,0,0);int con=3;
Button b_red,b_blue,b_green,
清除,b_quit;
public void init()
{ addMouseMotionListener(this);
b_red=new Button("画红色图形");
b_blue=new Button("兰色图形");
b_green=new Button("画绿色图形");
b_quit=new Button("橡皮");
清除=new Button("清除");
add(b_red); add(b_green); add(b_blue); add(b_quit);add(清除);
b_red.addActionListener(this); b_green.addActionListener(this);
b_blue.addActionListener(this); b_quit.addActionListener(this);
清除.addActionListener(this);
}
public void paint(Graphics g)
{ if(x!=-1&&y!=-1&&橡皮擦通知==0&&清除通知==0)
{ g.setColor(c); g.fillOval(x,y,con,con);
}
else if(橡皮擦通知==1&&清除通知==0)
{ g.clearRect(x,y,10,10);
}
else if(清除通知==1&&橡皮擦通知==0)
{ g.clearRect(0,0,getSize().width,getSize().height);
}
}
public void mouseDragged(MouseEvent e)
{ x=(int)e.getX();y=(int)e.getY(); repaint();
}
public void mouseMoved(MouseEvent e){ }
public void update(Graphics g)
{ paint(g);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==b_red)
{ 橡皮擦通知=0;清除通知=0; c=new Color(255,0,0);
}
else if(e.getSource()==b_green)
{ 橡皮擦通知=0;清除通知=0; c=new Color(0,255,0);
}
else if(e.getSource()==b_blue)
{ 橡皮擦通知=0;清除通知=0; c=new Color(0,0,255);
}
if(e.getSource()==b_quit)
{ 橡皮擦通知=1;清除通知=0 ;
}
if(e.getSource()==清除)
{ 清除通知=1; 橡皮擦通知=0;repaint();
}
}
}
import Java.awt.*;import Java.awt.event.*;import Java.applet.*;
import Javax.swing.SwingUtilities;
public class Example18_6 extends Frame implements MouseListener,MouseMotionListener
{ Button button;
int x,y;
boolean move=false;
Example18_6()
{ button=new Button("按钮");
button.addMouseListener(this);
button.addMouseMotionListener(this);
addMouseMotionListener(this);
setLayout(new FlowLayout());
add(button);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
setBounds(10,10,200,180);
setVisible(true); validate();
}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e)
{ move=false;
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e){}
public void mouseMoved(MouseEvent e){}
public void mouseDragged(MouseEvent e)
{ Button b=null;
if(e.getSource() instanceof Button) //在按钮上拖动鼠标导致按钮上发生鼠标事件。
{ b=(Button)e.getSource();
move=true;
//将鼠标拖动事件转移到棋盘,导致棋盘上发生鼠标拖动事件:
e=SwingUtilities.convertMouseEvent(button,e,this);
//并将从按钮转移得到的鼠标事件e传递给mouseDragged方法的参数。
}
if(e.getSource()==this)
{ if(move&&b!=null)
{ x=e.getX(); y=e.getY();
int w=b.getSize().width,h=b.getSize().height;
b.setLocation(x-w/2,y-h/2);
}
}
}
public static void main(String args[])
{ new Example18_6();
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example18_7 extends Applet implements
KeyListener
{ Button b[]=new Button[10];
int x,y;
public void init()
{ for(int i=0;i<=9;i++)
{ b[i]=new Button(""+i);
b[i].addKeyListener(this);
add(b[i]);
}
}
public void keyPressed(KeyEvent e)
{ Button button=(Button)e.getSource();
x=button.getBounds().x;
y=button.getBounds().y;
if(e.getKeyCode()==KeyEvent.VK_UP)
{ y=y-2;
if(y<=0) y=0;
button.setLocation(x,y);
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{ y=y+2;
if(y>=300) y=300;
button.setLocation(x,y);
}
else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{ x=x-2;
if(x<=0) x=0;
button.setLocation(x,y);
}
else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{ x=x+2;
if(x>=300) x=300;
button.setLocation(x,y);
}
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
}
import Java.awt.*;import Java.awt.event.*;
//创建棋盘的类：
class ChessPad extends Panel implements MouseListener,ActionListener
{ int x=-1,y=-1, 棋子颜色=1; //控制棋子颜色的成员变量。
Button button=new Button("重新开局"); //控制重新开局的按扭。
TextField text_1=new TextField("请黑棋下子"),
text_2=new TextField(); //提示下棋的两个文本框。
ChessPad()
{ setSize(440,440);
setLayout(null);setBackground(Color.pink);
addMouseListener(this);add(button);button.setBounds(10,5,60,26);
button.addActionListener(this);
add(text_1);text_1.setBounds(90,5,90,24);
add(text_2);text_2.setBounds(290,5,90,24);
text_1.setEditable(false);text_2.setEditable(false);
}
public void paint(Graphics g) //绘制围棋棋盘的外观。
{ for(int i=40;i<=380;i=i+20)
{ g.drawLine(40,i,400,i);
}
g.drawLine(40,400,400,400);
for(int j=40;j<=380;j=j+20)
{ g.drawLine(j,40,j,400);
}
g.drawLine(400,40,400,400);
g.fillOval(97,97,6,6); g.fillOval(337,97,6,6);
g.fillOval(97,337,6,6);g.fillOval(337,337,6,6);
g.fillOval(217,217,6,6);
}
public void mousePressed(MouseEvent e) //当按下鼠标左键时下棋子。
{ if(e.getModifiers()==InputEvent.BUTTON1_MASK)
{ x=(int)e.getX();y=(int)e.getY(); //获取按下鼠标时的坐标位置。
ChessPoint_black chesspoint_black=new ChessPoint_black(this);
ChessPoint_white chesspoint_white=new ChessPoint_white(this);
int a=(x+10)/20,b=(y+10)/20;
if(x/20<2||y/20<2||x/20>19||y/20>19) //棋盘以外不下棋子。
{}
else
{
if(棋子颜色==1) //当棋子颜色是1时下黑棋子。
{ this.add(chesspoint_black);
chesspoint_black.setBounds(a*20-7,b*20-7,16,16);
棋子颜色=棋子颜色*(-1);
text_2.setText("请白棋下子");
text_1.setText("");
}
else if(棋子颜色==-1) //当棋子颜色是-1时下白棋子。
{ this.add(chesspoint_white);
chesspoint_white.setBounds(a*20-7,b*20-7,16,16);
棋子颜色=棋子颜色*(-1);
text_1.setText("请黑棋下子");
text_2.setText("");
}
}
}
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e){}
public void actionPerformed(ActionEvent e)
{ this.removeAll();棋子颜色=1;
add(button);button.setBounds(10,5,60,26);
add(text_1);text_1.setBounds(90,5,90,24);
text_2.setText("");text_1.setText("请黑棋下子");
add(text_2);text_2.setBounds(290,5,90,24);
}
}
//负责创建黑色棋子的类：
class ChessPoint_black extends Canvas implements MouseListener
{ ChessPad chesspad=null; //棋子所在的棋盘。
ChessPoint_black(ChessPad p)
{ setSize(20,20);chesspad=p; addMouseListener(this);
}
public void paint(Graphics g) //绘制棋子的大小。
{ g.setColor(Color.black);g.fillOval(0,0,14,14);
}
public void mousePressed(MouseEvent e)
{ if(e.getModifiers()==InputEvent.BUTTON3_MASK)
{ chesspad.remove(this);//当用鼠标右键点击棋子时，从棋盘中去掉该棋子（悔棋）。
chesspad.棋子颜色=1;
chesspad.text_2.setText("");chesspad.text_1.setText("请黑棋下子");
}
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e)
{ if(e.getClickCount()>=2)
chesspad.remove(this); //当用左键双击该棋子时，吃掉该棋子。
}
}
//负责创建白色棋子的类：
class ChessPoint_white extends Canvas implements MouseListener
{ ChessPad chesspad=null;
ChessPoint_white(ChessPad p)
{ setSize(20,20);addMouseListener(this);
chesspad=p;
}
public void paint(Graphics g)
{ g.setColor(Color.white);g.fillOval(0,0,14,14);
}
public void mousePressed(MouseEvent e)
{ if(e.getModifiers()==InputEvent.BUTTON3_MASK)
{ chesspad.remove(this);chesspad.棋子颜色=-1;
chesspad.text_2.setText("请白棋下子"); chesspad.text_1.setText("");
}
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseClicked(MouseEvent e)
{ if(e.getClickCount()>=2)
chesspad.remove(this);
}
}
public class Chess extends Frame //添加棋盘的窗口。
{ ChessPad chesspad=new ChessPad();
Chess()
{ setVisible(true);
setLayout(null);
Label label=
new Label("单击左键下棋子，双击吃棋子，用右键单击棋子悔棋",Label.CENTER);
add(label);label.setBounds(70,55,440,26);
label.setBackground(Color.orange);
add(chesspad);chesspad.setBounds(70,90,440,440);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
pack();setSize(600,550);
}
public static void main(String args[])
{ Chess chess=new Chess();
}
}
import Java.awt.event.*;import Java.applet.*;
import Java.awt.*;
public class Move extends.Applet implements KeyListener,ActionListener
{ Button b_go=new Button("go"),
b_replay=new Button("replay");
Rectangle rect1,rect2,rect3;
int b_x=0,b_y=0;
public void init()
{ b_go.addKeyListener(this);
b_replay.addActionListener(this);
setLayout(null);
//代表迷宫的矩形：
rect1=new Rectangle(20,40,200,40);
rect2=new Rectangle(200,40,24,240);
rect3=new Rectangle(200,220,100,40);
b_go.setBackground(Color.red); //代表走迷宫者的按扭。
add(b_go);b_go.setBounds(22,45,20,20);
b_x=b_go.getBounds().x;b_y=b_go.getBounds().y;
b_go.requestFocus() ;
add(b_replay);b_replay.setBounds(2,2,45,16);//点击重新开始的按扭。
}
public void paint(Graphics g)
{ //画出迷宫：
g.setColor(Color.green);
g.fillRect(20,40,200,40);
g.setColor(Color.yellow);
g.fillRect(200,40,40,240);
g.setColor(Color.cyan);
g.fillRect(200,220,100,40);
g.drawString("出口",310,220);
g.setColor(Color.black);
g.drawString("点击红色按扭，然后用键盘上的方向键移动按扭",100,20);
}
public void keyPressed(KeyEvent e)
{ //按键盘上的上下、左右键在迷宫中行走：
if((e.getKeyCode()==KeyEvent.VK_UP))
{ //创建一个和按扭：b_go 同样大小的矩形：
Rectangle rect=new Rectangle(b_x,b_y,20,20);
//要求必须在迷宫内行走：
if(rect.intersects(rect1)||rect.intersects(rect2)||
rect.intersects(rect3))
{ b_y=b_y-2;b_go.setLocation(b_x,b_y);
}
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{ Rectangle rect=new Rectangle(b_x,b_y,20,20);
if(rect.intersects(rect1)||rect.intersects(rect2)||
rect.intersects(rect3))
{ b_y=b_y+2;b_go.setLocation(b_x,b_y);
}
}
else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{ Rectangle rect=new Rectangle(b_x,b_y,20,20);
if(rect.intersects(rect1)||rect.intersects(rect2)
||rect.intersects(rect3))
{ b_x=b_x-2;b_go.setLocation(b_x,b_y);
}
}
else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{ Rectangle rect=new Rectangle(b_x,b_y,20,20);
if(rect.intersects(rect1)||rect.intersects(rect2)||
rect.intersects(rect3))
{ b_x=b_x+2;b_go.setLocation(b_x,b_y);
}
}
}
public void keyReleased(KeyEvent e){}
public void keyTyped(KeyEvent e){}
public void actionPerformed(ActionEvent e)
{ b_go.setBounds(22,45,20,20);
b_x=b_go.getBounds().x;b_y=b_go.getBounds().y;
b_go.requestFocus() ;
}
}
import Java.awt.*;import Java.applet.*;import Java.awt.event.*;
class People extends Button implements FocusListener //代表华容道人物的类。
{ Rectangle rect=null;
int left_x,left_y;//按扭的左上角坐标.
int width,height; //按扭的宽和高.
String name; int number;
People(int number,String s,int x,int y,int w,int h,Hua_Rong_Road road)
{ super(s);
name=s;this.number=number;
left_x=x;left_y=y;
width=w;height=h;setBackground(Color.orange);
road.add(this); addKeyListener(road);
setBounds(x,y,w,h);addFocusListener(this);
rect=new Rectangle(x,y,w,h);
}
public void focusGained(FocusEvent e)
{ setBackground(Color.red);
}
public void focusLost(FocusEvent e)
{ setBackground(Color.orange);
}
}
public class Hua_Rong_Road extends Applet implements KeyListener,ActionListener
{ People people[]=new People[10];
Rectangle left,right,above ,below;//华容道的边界 .
Button restart=new Button("重新开始");
public void init()
{ setLayout(null); add(restart);
restart.setBounds(5,5,80,25);
restart.addActionListener(this);
people[0]=new People(0,"曹操",104,54,100,100,this);
people[1]=new People(1,"关羽",104,154,100,50,this);
people[2]=new People(2,"张飞",54, 154,50,100,this);
people[3]=new People(3,"刘备",204,154,50,100,this);
people[4]=new People(4,"张辽",54, 54, 50,100,this);
people[5]=new People(5,"曹仁",204, 54, 50,100,this);
people[6]=new People(6,"兵 ",54,254,50,50,this);
people[7]=new People(7,"兵 ",204,254,50,50,this);
people[8]=new People(8,"兵 ",104,204,50,50,this);
people[9]=new People(9,"兵 ",154,204,50,50,this);
people[9].requestFocus();
left=new Rectangle(49,49,5,260);
people[0].setForeground(Color.white) ;
right=new Rectangle(254,49,5,260);
above=new Rectangle(49,49,210,5);
below=new Rectangle(49,304,210,5);
}
public void paint(Graphics g)
{ //画出华容道的边界:
g.setColor(Color.cyan);
g.fillRect(49,49,5,260);//left.
g.fillRect(254,49,5,260);//right.
g.fillRect(49,49,210,5); //above.
g.fillRect(49,304,210,5);//below.
//提示曹操逃出位置和按键规则:
g.drawString("点击相应的人物,然后按键盘上的上下左右箭头移动",100,20);
g.setColor(Color.red);
g.drawString("曹操到达该位置",110,300);
}
public void keyPressed(KeyEvent e)
{ People man=(People)e.getSource();//获取事件源.
man.rect.setLocation(man.getBounds().x, man.getBounds().y);
if(e.getKeyCode()==KeyEvent.VK_DOWN)
{ man.left_y=man.left_y+50; //向下前进50个单位。
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
//判断是否和其它人物或下边界出现重叠,如果出现重叠就退回50个单位距离。
for(int i=0;i<10;i++)
{if((man.rect.intersects(people[i].rect))&&(man.number!=i))
{ man.left_y=man.left_y-50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(man.rect.intersects(below))
{ man.left_y=man.left_y-50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(e.getKeyCode()==KeyEvent.VK_UP)
{ man.left_y=man.left_y-50; //向上前进50个单位。
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
//判断是否和其它人物或上边界出现重叠,如果出现重叠就退回50个单位距离。
for(int i=0;i<10;i++)
{ if((man.rect.intersects(people[i].rect))&&(man.number!=i))
{ man.left_y=man.left_y+50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(man.rect.intersects(above))
{ man.left_y=man.left_y+50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(e.getKeyCode()==KeyEvent.VK_LEFT)
{ man.left_x=man.left_x-50; //向左前进50个单位。
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
//判断是否和其它人物或左边界出现重叠,如果出现重叠就退回50个单位距离。
for(int i=0;i<10;i++)
{ if((man.rect.intersects(people[i].rect))&&(man.number!=i))
{ man.left_x=man.left_x+50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(man.rect.intersects(left))
{ man.left_x=man.left_x+50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{ man.left_x=man.left_x+50; //向右前进50个单位。
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
//判断是否和其它人物或右边界出现重叠,如果出现重叠就退回50个单位距离。
for(int i=0;i<10;i++)
{ if((man.rect.intersects(people[i].rect))&&(man.number!=i))
{ man.left_x=man.left_x-50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
if(man.rect.intersects(right))
{ man.left_x=man.left_x-50;
man.setLocation(man.left_x,man.left_y);
man.rect.setLocation(man.left_x,man.left_y);
}
}
}
public void keyTyped(KeyEvent e){}
public void keyReleased(KeyEvent e){}
public void actionPerformed(ActionEvent e)
{ this.removeAll();
this.init();
}
}
public class Example19_1
{ public static void main(String args[])
{ Lefthand left;
Righthand right;
left=new Lefthand() ;//创建线程。
right=new Righthand();
left.start(); //线程开始运行后，Lefthand类中的run方法将被执行。
right.start();
}
}
class Lefthand extends Thread
{ public void run()
{ for(int i=1;i<=5;i++)
{ System.out.print("A");
try {
sleep(500);
}
catch(InterruptedException e){}
}
}
}
class Righthand extends Thread
{ public void run()
{ for(int i=1;i<=5;i++)
{ System.out.print("B");
try{ sleep(300);
}
catch(InterruptedException e){}
}
}
}
import Java.awt.*;import Java.awt.event.*;
public class Example19_3
{ public static void main(String args[])
{ Mywin win=new Mywin();win.pack();
}
}
class Mywin extends Frame implements Runnable
{ Button b=new Button("ok");int x=5;
Thread bird=null;
Mywin()
{ setBounds(100,100,120,120);setLayout(new FlowLayout());
setVisible(true);
add(b);b.setBackground(Color.green);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
bird=new Thread(this);//创建一个新的线程，窗口做目标对象，
//替线程bird实现接口Runnable。
bird.start(); //在创建窗口时又开始了线程bird。
}
public void run() //实现bird的操作。
{ while(true)
{ x=x+1;
if(x>100) x=5;
b.setBounds(40,40,x,x);
try{ bird.sleep(200);
}
catch(InterruptedException e){}
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example19_3 extends Appletimplements ActionListener,Runnable
{ TextField text1,text2;
boolean boo; int x=0;
Thread Scrollwords=null;
public void init()
{ Scrollwords=new Thread(this);
text1=new TextField(10);
text2=new TextField(10);
add(text1); add(text2);
text1.addActionListener(this);
}
public void start()
{ boo=false;
try{ Scrollwords.start();
}
catch(Exception ee) { }
}
public void run ()
{ while(true)
{ x=x+5;
if(x>200)
x=0;
repaint();
try{ Scrollwords .sleep(80);
}
catch(InterruptedException e){}
if(boo)
{ return; //结束run方法，导致线程死亡。
}
}
}
public void paint(Graphics g)
{ g.drawString("欢 迎使 用 本 字 典",x,70);
}
public void actionPerformed(ActionEvent e)
{ if(text1.getText().equals("boy"))
{ text2.setText("男孩");
}
else if(text1.getText().equals("moon"))
{ boo=true; //将boo的值设置为true，以便杀死线程Scrollwords。
}
else
{ text2.setText("没有该单词");
}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example19_4 extends Applet implements Runnable
{ Thread left ,right; Graphics mypen; int x,y;
public void init()
{ left=new Thread(this);right=new Thread(this);
x=10;y=10;mypen=getGraphics();
}
public void start()
{ left.start();right.start();
}
public void run()
{ while(true)
{ if(Thread.currentThread()==left)
{ x=x+1;
if(x>240) x=10;
mypen.setColor(Color.blue);
mypen.clearRect(10,10,300,40);
mypen.drawRect(10+x,10,40,40);
try{ left.sleep(60);
}
catch(InterruptedException e){}
}
else if(Thread.currentThread()==right)
{ y=y+1;
if(y>240) y=10; mypen.setColor(Color.red);
mypen.clearRect(10,90,300,40);
mypen.drawOval(10+y,90,40,40);
try{ right.sleep(60);
}
catch(InterruptedException e){}
}
}
}
public void stop()
{ left=null;right=null;
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.applet.*;
public class Example19_5 extends Applet
implements Runnable
{ Thread 红色球,兰色球;
Graphics redPen,bluePen;
double t=0;
public void init()
{ 红色球=new Thread(this);
兰色球=new Thread(this);
redPen=getGraphics();bluePen=getGraphics();
redPen.setColor(Color.red); bluePen.setColor(Color.blue);
}
public void start()
{ 红色球.start();兰色球.start();
}
public void run()
{ while(true)
{ t=t+0.2;
if(Thread.currentThread()==红色球)
{ if(t>20) t=0;
redPen.clearRect(0,0,38,300);
redPen.fillOval(20,(int)(1.0/2*t*t*3.8),16,16);
try{ 红色球.sleep(50);
}
catch(InterruptedException e){}
}
else if(Thread.currentThread()==兰色球)
{ bluePen.clearRect(38,0,500,300);
bluePen.fillOval(38+(int)(16*t),(int)(1.0/2*t*t*3.8),16,16);
try{ 兰色球.sleep(50);
}
catch(InterruptedException e){}
}
}
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example19_6 extends Applet implements ActionListener
{ Toolkit toolkit;Button button;
public void init()
{ toolkit=getToolkit();//获得一个工具包对象
button=new Button("确定");add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button)
{ for(int i=0;i<=9;i++)
{ toolkit.beep();
try { Thread.sleep(500);
} //每隔半秒钟发出嘟声
catch(InterruptedException e1){}
}
}
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example19_7 extends Applet implements Runnable
{ int money=100;TextArea text1,text2;
Thread 会计,出纳;
public void init()
{ 会计=new Thread(this); 出纳=new Thread(this);//创建两个线程:会计、出纳。
text1=new TextArea(20,8); text2=new TextArea(20,8);
add(text1);add(text2);
}
public void start()
{ 会计.start();出纳.start(); //线程开始。
}
public synchronized void 存取(int number) //存取方法。
{ if(Thread.currentThread()==会计)
{ for(int i=1;i<=3;i++) //会计使用存取方法存入90元，存入30元，稍歇一下，
{ money=money+number; //这时出纳仍不能使用存取方法，
try { Thread.sleep(1000); //因为会计还没使用完存取方法。
}
catch(InterruptedException e){}
text1.append("/n"+money);
}
}
else if(Thread.currentThread()==出纳)
{ for(int i=1;i<=2;i++) //出纳使用存取方法取出30元，取出15元，稍歇一下，
{ money=money-number/2; //这时会计仍不能使用存取方法，
try { Thread.sleep(1000); //因为出纳还没使用完存取方法。
}
catch(InterruptedException e){}
text2.append("/n"+money);
}
}
}
public void run()
{ if(Thread.currentThread()==会计||Thread.currentThread()==出纳)
{ for(int i=1;i<=3;i++) //从周一到周三会计和出纳都要使用帐本。
{ 存取(30);
}
}
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
class 售票员
{ int 五元钱的个数=2,十元钱的个数=0,二十元钱的个数=0; String s=null;
public synchronized void 售票规则(int money)
{ if(money==5) //如果使用该方法的线程传递的参数是5,就不用等待。
{ 五元钱的个数=五元钱的个数+1;
s= "给您入场卷您的钱正好";
Example19_8.text.append("/n"+s);
}
else if(money==20)
{ while(五元钱的个数<3)
{ try { wait(); //如果使用该方法的线程传递的参数是20须等待。
}
catch(InterruptedException e){}
}
五元钱的个数=五元钱的个数-3;
二十元钱的个数=二十元钱的个数+1;
s="给您入场卷"+" 您给我20，找您15元";
Example19_8.text.append("/n"+s);
}
notifyAll();
}
}
public class Example19_8 extends Applet implements Runnable
{ 售票员 王小姐;
Thread 张平,李明; //创建两个线程。
static TextArea text;
public void init()
{ 张平=new Thread(this);李明=new Thread(this);
text=new TextArea(10,30);add(text);
王小姐=new 售票员();
}
public void start()
{ 张平.start();李明.start();
}
public void run()
{ if(Thread.currentThread()==张平)
{ 王小姐.售票规则(20);
}
else if(Thread.currentThread()==李明)
{ 王小姐.售票规则(5);
}
}
}
import Java.awt.event.*;
import Java.awt.*;import Java.util.Date;
class Example19_9 extends Frame implements Runnable,ActionListener
{ Thread thread=null; TextArea text=null;
Button b_start=new Button("Start"),b_stop=new Button("Stop");
Example19_9()
{ thread=new Thread(this);
text=new TextArea();add(text,"Center");
Panel p=new Panel();p.add(b_start);p.add(b_stop);
b_start.addActionListener(this);
b_stop.addActionListener(this) ;
add(p,"North");setVisible(true);
setSize(500,500);pack();setSize(500,500);
setResizable(false); //让窗口的大小不能被调整。
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==b_start)
{
if(!(thread.isAlive()))
{ thread=new Thread(this);
}
try { thread.start();
}
catch(Exception e1)
{ text.setText("线程没有结束run方法之前，不要再调用start方法");
}
}
else if(e.getSource()==b_stop)
{ thread.interrupt();
}
}
public void run()
{ while(true)
{ text.append("/n"+new Date());
try{ thread.sleep(1000);
}
catch(InterruptedException ee)
{ text.setText("我被消灭");return;//结束run语句,消灭该线程。
}
}
}
public static void main(String args[])
{ Example19_9 tt=new Example19_9();
}
}
import Java.awt.*;import Java.awt.event.*;import Java.applet.*;
public class Example19_10 extends Applet implements Runnable,ActionListener
{ Button b=new Button("go");TextField text=null;
Thread 发令员,运动员_1,运动员_2;
int x=10;//线程运动的起始位置。
Graphics mypen=null;
public void init()
{ b.addActionListener(this);text=new TextField(20);
发令员=new Thread(this);运动员_1=new Thread(this);运动员_2=new Thread(this);
add(b);add(text);
mypen=getGraphics();
}
public void start()
{ 发令员.start();
}
public void actionPerformed(ActionEvent e)
{ 发令员.interrupt();//点击按扭结束发令员的生命。
}
public void run()
{ if(Thread.currentThread()==发令员)
{ while(true)
{ text.setText("准备跑... ...");text.setText("......");
try { 发令员.sleep(30);
}
catch(InterruptedException e)
{ //点击按扭结束生命，并让运动员_1开始跑。
text.setText("跑");
运动员_1.start(); break;
}
}
}
if(Thread.currentThread()==运动员_1)
{ while(true)
{ x=x+1;
mypen.setColor(Color.blue);
mypen.clearRect(10,80,99,100);//显示线程运动的动画。
mypen.fillRect(x,85,5,5);
try { 运动员_1.sleep(10);
}
catch(InterruptedException e)
{ //通知运动员_2开始跑，运动员_1结束生命：
运动员_2.start(); return;
}
if(x>=100)
{ 运动员_1.interrupt();//运动员_1当跑到100米处时结束生命。
}
}
}
if(Thread.currentThread()==运动员_2)
{ while(true)
{ x=x+1;
mypen.setColor(Color.red);
mypen.clearRect(105,80,150,100);//显示线程运动的动画。
mypen.fillRect(x+5,85,7,7);
try { 运动员_2.sleep(10);
}
catch(InterruptedException e)
{text.setText("到达终点"); return;
}
if(x>=200) //运动员_2跑到200米处时结束生命。
{ 运动员_2.interrupt();
}
}
}
}
}
import Java.awt.*;import Java.util.*;import Java.awt.event.*;
import Java.awt.geom.*;import Java.applet.*;
public class Example19_11 extends Applet implements Runnable
{ Thread 时针=null,分针=null,秒针=null;//用来表示时针,分针和秒针的线程.
//表示时针,分针,秒针端点的整型变量:
int hour_a,hour_b,munite_a,munite_b,second_a,second_b;
//用来获取当前时间的整型变量:
int hour=0,munite=0,second=0;
//用来绘制时针,分针和秒针的Grapghics对象:
Graphics g_second=null,g_munite=null,g_hour=null;
//用来存放表盘刻度的数组,供指针走动时使用:
double point_x[]=new double[61], point_y[]=new double[61] ;
//用来存放表盘刻度的数组,供绘制表盘使用:
double scaled_x[]=new double[61], scaled_y[]=new double[61] ;
//用来判断小程序是否重新开始的变量:
int start_count=0;
public void init()
{g_hour=this.getGraphics(); g_hour.setColor(Color.cyan);
g_second=this.getGraphics(); g_second.setColor(Color.red);
g_munite=this.getGraphics(); g_munite.setColor(Color.blue);
g_second.translate(200,200);//进行坐标系变换，将新坐标系原点设在(200,200)处。
g_munite.translate(200,200);
g_hour.translate(200,200);
point_x[0]=0;point_y[0]=-120; //各个时针十二点处的位置坐标(按新坐标系的坐标)。
scaled_x[0]=0;scaled_y[0]=-140; //十二点处的刻度位置坐标(按新坐标系的坐标)。
double jiaodu=6*Math.PI/180;
//表盘分割成60分，将分割点处的坐标存放在数组中：
for(int i=0;i<60;i++)
{ point_x[i+1]=point_x[i]*Math.cos(jiaodu)-
Math.sin(jiaodu)*point_y[i];
point_y[i+1]=point_y[i]*Math.cos(jiaodu)+
point_x[i]*Math.sin(jiaodu);
}
point_x[60]=0;point_y[60]=-120;//十二点各个时针的位置坐标(按新坐标系的坐标)。
//表盘分割成60分，将分割点处的坐标存放在数组中：
for(int i=0;i<60;i++)
{ scaled_x[i+1]=scaled_x[i]*Math.cos(jiaodu)-
Math.sin(jiaodu)*scaled_y[i];
scaled_y[i+1]=scaled_y[i]*Math.cos(jiaodu)+
scaled_x[i]*Math.sin(jiaodu);
}
scaled_x[60]=0; scaled_y[60]=-140;//十二点处刻度位置坐标(按新坐标系的坐标)。
}
public void start()
{ //每当小程序重新开始时,首先消灭线程,然后重新开始创建线程。
if(start_count>=1)
{秒针.interrupt();分针.interrupt();时针.interrupt();
}
秒针=new Thread(this);分针=new Thread(this);
时针=new Thread(this);
秒针.start();分针.start();时针.start();
start_count++;if(start_count>=2) start_count=1;
}
public void stop()
{秒针.interrupt();分针.interrupt();时针.interrupt();
}
public void paint(Graphics g)
{ //每当小程序重新绘制自己时,重新开始创建线程：
this.start();
//绘制表盘的外观:
g.drawOval(50,50,300,300);//表盘的外圈。
g.translate(200,200);
//绘制表盘上的小刻度和大刻度：
for(int i=0;i<60;i++)
{ if(i%5==0)
{ g.setColor(Color.red);
g.fillOval((int) scaled_x[i],(int) scaled_y[i],8,8);
}
else
g.fillOval((int) scaled_x[i],(int) scaled_y[i],3,3);
}
}
public void run()
{ //获取本地时间:
Date date=new Date();String s=date.toString();
hour=Integer.parseInt(s.substring(11,13));
munite=Integer.parseInt(s.substring(14,16));
second=Integer.parseInt(s.substring(17,19));
if(Thread.currentThread()==秒针)
{ second_a=(int)point_x[second];second_b=(int)point_y[second];
g_second.drawLine(0,0,second_a,second_b); //秒针的初始位置。
g_second.drawString("秒",second_a,second_b);
int i=second;
while(true) //秒针开始行走,每一秒走6度.
{try{秒针.sleep(1000);
Color c=getBackground();g_second.setColor(c);
g_second.drawLine(0,0,second_a,second_b);//用背景色清除前一秒时的秒针。
g_second.drawString("秒",second_a,second_b);
//如果这时秒针与分针重合,恢复分针的显示:
if((second_a==munite_a)&&(second_b==munite_b))
{ g_munite.drawLine(0,0,munite_a,munite_b);
g_munite.drawString("分",munite_a,munite_b);
}
//如果这时秒针与时针重合,恢复时针的显示:
if((second_a==hour_a)&&(second_b==hour_b))
{ g_hour.drawLine(0,0,hour_a,hour_b);
g_hour.drawString("时",hour_a,hour_b);
}
}
catch(InterruptedException e)
{ Color c=getBackground();g_second.setColor(c);
g_second.drawLine(0,0,second_a,second_b);//用背景色清除秒针。
g_second.drawString("秒",second_a,second_b);
return;
}
//秒针向前走一个单位:
second_a=(int)point_x[(i+1)%60];
second_b=(int)point_y[(i+1)%60];//每一秒走6度(一个单位格)。
g_second.setColor(Color.red);
g_second.drawLine(0,0,second_a,second_b); //绘制新的秒针。
g_second.drawString("秒",second_a,second_b);
i++;
}
}
if(Thread.currentThread()==分针)
{
munite_a=(int)point_x[munite];munite_b=(int)point_y[munite];
g_munite.drawLine(0,0,munite_a,munite_b);//分针的初始位置。
g_munite.drawString("分",munite_a,munite_b);
int i=munite;
while(true)
{ //第一次,过60-second秒就前进一分钟,以后每过60秒前进一分钟。
try{分针.sleep(1000*60-second*1000);second=0;
Color c=getBackground();g_munite.setColor(c);
//用背景色清除前一分钟的分针：
g_munite.drawLine(0,0,munite_a,munite_b);
g_munite.drawString("分",munite_a,munite_b);
//如果这时分针与时针重合，恢复时针的显示:
if((hour_a==munite_a)&&(hour_b==munite_b))
{ g_hour.drawLine(0,0,hour_a,hour_b);
g_hour.drawString("时",hour_a,hour_b);
}
}
catch(InterruptedException e)
{return;
}
//分针向前走一个单位:
munite_a=(int)point_x[(i+1)%60];
munite_b=(int)point_y[(i+1)%60];//分针每分钟走6度(一个单位格)。
g_munite.setColor(Color.blue);
g_munite.drawLine(0,0,munite_a,munite_b);//绘制新的分针。
g_munite.drawString("分",munite_a,munite_b);
i++; second=0;
}
}
if(Thread.currentThread()==时针)
{ int h=hour%12;
hour_a=(int)point_x[h*5+munite/12];
hour_b=(int)point_y[h*5+munite/12];
int i= h*5+munite/12;
g_hour.drawLine(0,0,hour_a,hour_b);
g_hour.drawString("时",hour_a,hour_b);
while(true)
{//第一次,过12-munite%12分钟就前进一个刻度,以后每过12分钟前进一个刻度.
try{
时针.sleep(1000*60*12-1000*60*(munite%12)-second*1000);munite=0;
Color c=getBackground();g_hour.setColor(c);
g_hour.drawLine(0,0,hour_a,hour_b);// 用背景色清除前12分钟时的时针.
g_hour.drawString("时",hour_a,hour_b);
}
catch(InterruptedException e)
{return;
}
hour_a=(int)point_x[(i+1)%60];
hour_b=(int)point_y[(i+1)%60];//时针每12分走6度(一个单位格)
g_hour.setColor(Color.cyan);
g_hour.drawLine(0,0,hour_a,hour_b);//绘制新的时针.
g_hour.drawString("时",hour_a,hour_b);
i++; munite=0;
}
}
}
}
import Java.io.*;
class Example20_1
{ public static void main(String args[])
{ File f1=new File("F://8000","Example20_1.Java");
File f2=new File("F://8000");
System.out.println("文件Example20_1是可读的吗:"+f1.canRead());
System.out.println("文件Example20_1的长度:"+f1.length());
System.out.println("文件Example20_1的绝对路径:"+f1.getAbsolutePath());
System.out.println("F://8000:是目录吗？"+f2.isDirectory());
}
}
import Java.io.*;
class FileAccept implements FilenameFilter
{ String str=null;
FileAccept(String s)
{ str="."+s;
}
public boolean accept(File dir,String name)
{ return name.endsWith(str);
}
}
public class Example20_2
{ public static void main(String args[])
{ File dir=new File("F:/8000");
FileAccept acceptCondition=new FileAccept("Java");
String fileName[]=dir.list(acceptCondition);
for(int i=0;i<5;i++)
{ System.out.println(fileName[i]);
}
}
}
import Java.io.*;import Java.awt.*;import Java.awt.event.*;
class Example20_3
{ public static void main(String args[])
{ int b;
TextArea text;
Frame window=new Frame();
byte tom[]=new byte[25];
window.setSize(100,100);text=new TextArea(10,16);
window.setVisible(true);window.add(text,BorderLayout.CENTER);
window.pack();
window.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
try{ File f=new File("F://8000","Example20_1.Java");
FileInputStream readfile=new FileInputStream(f);
while((b=readfile.read(tom,0,25))!=-1)
{
String s=new String (tom,0,b);
System.out.println(s);
text.append(s);
}
readfile.close();
}
catch(IOException e)
{ System.out.println("File read Error");
}
}
}
import Java.io.*;
class Example20_4
{ public static void main(String args[])
{ int b;
byte buffer[]=new byte[100];
try{ System.out.println("输入一行文本，并存入磁盘：");
b=System.in.read(buffer); //把从键盘敲入的字符存入buffer。
FileOutputStream writefile=new FileOutputStream("line.txt");
writefile.write(buffer,0,b); // 通过流把 buffer写入到文件line.txt。
}
catch(IOException e)
{ System.out.println("Error ");
}
}
}
import Java.io.*;import Java.awt.*;import Java.awt.event.*;
class Example20_5
{ public static void main(String args[])
{ char a[]="今晚10点发起总攻".toCharArray();
int n=0,m=0;
try{ File f=new File("F://8000","secret.txt");
for(int i=0;i<a.length;i++)
{ a[i]=(char)(a[i]^'R');
}
FileWriter out=new FileWriter(f);
out.write(a,0,a.length);
out.close();
FileReader in=new FileReader(f);
int length=(int)f.length();
char tom[]=new char[length];
while((n=in.read(tom,0,length))!=-1)
{ String s=new String (tom,0,n);
m=n;
System.out.println("密文:"+s);
}
in.close();
for(int i=0;i<m;i++)
{ tom[i]=(char)(tom[i]^'R');
}
String 明文=new String(tom,0,m);
System.out.println("明文:"+明文);
}
catch(IOException e)
{ System.out.println("File read Error");
}
}
}
import Java.io.*;
import Java.awt.*;
import Java.awt.event.*;
class EWindow extends Frame implements ActionListener
{ TextArea text;
Button buttonRead,buttonWrite;
BufferedReader bufferIn;
FileReader in;
BufferedWriter bufferOut;
FileWriter out;
EWindow()
{ super("流的读取");
text=new TextArea(10,10);text.setBackground(Color.cyan);
buttonRead =new Button("读取");
buttonRead.addActionListener(this);
buttonWrite =new Button("写出");
buttonWrite.addActionListener(this);
setLayout(new BorderLayout());
setSize(340,340);
setVisible(true);
add(text,BorderLayout.CENTER);
Panel pNorth=new Panel();
pNorth.add(buttonRead);pNorth.add(buttonWrite);
pNorth.validate();
add(BorderLayout.NORTH,pNorth);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{ String s;
if(e.getSource()==buttonRead)
{ try{ text.setText(null);
File f=new File("F://8000//","E.Java");
in=new FileReader(f);
bufferIn=new BufferedReader(in);
while((s=bufferIn.readLine())!=null)
{ text.append(s+'/n');
}
bufferIn.close();
in.close();
}
catch(IOException exp){System.out.println(exp);}
}
if(e.getSource()==buttonWrite)
{ try { File f=new File("F://8000//","E.Java");
FileWriter out=new FileWriter(f);
BufferedWriter bufferOut=new BufferedWriter(out);
bufferOut.write(text.getText(),0,(text.getText()).length());
bufferOut.flush();
bufferOut.close();
out.close();
}
catch(IOException exp){ System.out.println(exp);}
}
}
}
public class Example20_6
{ public static void main(String args[])
{ EWindow w=new EWindow();
w.validate();
}
}
import Java.util.*;import Java.io.*;
import Java.awt.*;import Java.awt.event.*;
class EWindow extends Frame implements ActionListener,ItemListener
{ String str[]=new String[7];String s;
FileReader file;
BufferedReader in;
Button start,next;
Checkbox box[];
TextField 题目,分数;
int score=0;
CheckboxGroup age=new CheckboxGroup();
EWindow()
{ super("英语单词学习");
分数=new TextField(10);题目=new TextField(70);
start=new Button("重新练习");start.addActionListener(this);
next=new Button("下一题目");next.addActionListener(this);
box=new Checkbox[4];
for(int i=0;i<=3;i++)
{ box[i]=new Checkbox("",false,age);
box[i].addItemListener(this);
}
try { file=new FileReader("English.txt");
in=new BufferedReader(file);
}
catch(IOException e){}
setBounds(100,100,400,320); setVisible(true);
setLayout(new GridLayout(4,1));
setBackground(Color.pink);
Panel p1=new Panel(),p2=new Panel(),
p3=new Panel() ,p4=new Panel(),p5=new Panel();
p1.add(new Label("题目:"));p1.add(题目);
p2.add(new Label("选择答案："));
for(int i=0;i<=3;i++)
{ p2.add(box[i]);
}
p3.add(new Label("您的得分:"));p3.add(分数);
p4.add(start); p4.add(next);
add(p1); add(p2);add(p3); add(p4);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
reading();
}
public void reading()
{ int i=0;
try { s=in.readLine();
if(!(s.startsWith("endend")))
{ StringTokenizer tokenizer=new StringTokenizer(s,"#");
while(tokenizer.hasMoreTokens())
{ str[i]=tokenizer.nextToken();
i++;
}
题目.setText(str[0]);
for(int j=1;j<=4;j++)
{ box[j-1].setLabel(str[j]);
}
}
else if(s.startsWith("endend"))
{ 题目.setText("学习完毕");
for(int j=0;j<4;j++)
{ box[j].setLabel("end");
in.close();file.close();
}
}
}
catch(Exception exp){ 题目.setText("无试题文件") ; }
}
public void actionPerformed(ActionEvent event)
{ if(event.getSource()==start)
{ score=0;
分数.setText("得分： "+score);
try { file=new FileReader("English.txt");
in=new BufferedReader(file);
}
catch(IOException e){}
reading();
}
if(event.getSource()==next)
{ reading();
for(int j=0;j<4;j++)
{
box[j].setEnabled(true);
}
}
}
public void itemStateChanged(ItemEvent e)
{ for(int j=0;j<4;j++)
{ if(box[j].getLabel().equals(str[5])&&box[j].getState())
{ score++;
分数.setText("得分： "+score);
}
box[j].setEnabled(false);
}
}
}
public class Example20_7
{ public static void main(String args[])
{ EWindow w=new EWindow();
w.pack();
}
}
import Java.awt.*;import Java.io.*;
import Java.awt.event.*;
public class Example20_8
{ public static void main(String args[])
{ FileWindows win=new FileWindows();
}
}
class FileWindows extends Frame implements ActionListener
{ FileDialog filedialog_save,filedialog_load;//声明2个文件对话筐
MenuBar menubar;
Menu menu;
MenuItem itemOpen,itemSave;
TextArea text;
BufferedReader in;
FileReader file_reader;
BufferedWriter out;
FileWriter tofile;
FileWindows()
{ super("带文件对话框的窗口");
setSize(260,270);
setVisible(true);
menubar=new MenuBar();
menu=new Menu("文件");
itemOpen=new MenuItem("打开文件");
itemSave=new MenuItem("保存文件");
itemOpen.addActionListener(this);
itemSave.addActionListener(this);
menu.add(itemOpen);
menu.add(itemSave);
menubar.add(menu);
setMenuBar(menubar);
filedialog_save=new FileDialog(this,"保存文件话框",FileDialog.SAVE);
filedialog_load=new FileDialog(this,"打开文件话框",FileDialog.LOAD);
filedialog_save.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ filedialog_save.setVisible(false);
}
});
filedialog_load.addWindowListener(new WindowAdapter()//对话框增加适配器
{public void windowClosing(WindowEvent e)
{ filedialog_load.setVisible(false);
}
});
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);}
});
text=new TextArea(10,10);
add(text,BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==itemOpen)
{ filedialog_load.setVisible(true);
text.setText(null);
String s;
if(filedialog_load.getFile()!=null)
{
try{ File file= new
File(filedialog_load.getDirectory(),filedialog_load.getFile());
file_reader=new FileReader(file);
in=new BufferedReader(file_reader);
while((s=in.readLine())!=null)
text.append(s+'/n');
in.close();
file_reader.close();
}
catch(IOException e2){}
}
}
else if(e.getSource()==itemSave)
{ filedialog_save.setVisible(true);
if(filedialog_save.getFile()!=null)
{
try {
File file=new
File(filedialog_save.getDirectory(),filedialog_save.getFile());
tofile=new FileWriter(file);
out=new BufferedWriter(tofile);
out.write(text.getText(),0,(text.getText()).length());
out.flush();
out.close();
tofile.close();
}
catch(IOException e2){}
}
}
}
}
import Java.awt.*;import Java.io.*;
import Java.awt.event.*;
public class Example20_9
{ public static void main(String args[])
{ try{
Runtime ce=Runtime.getRuntime();
ce.exec("Java Example20_8");
File file=new File("c:/windows","Notepad.exe");
ce.exec(file.getAbsolutePath());
}
catch(Exception e){}
}
}
import Java.io.*;
public class Example20_10
{ public static void main(String args[])
{ RandomAccessFile in_and_out=null;
int data[]={1,2,3,4,5,6,7,8,9,10};
try{ in_and_out=new RandomAccessFile("tom.dat","rw");
}
catch(Exception e){}
try{ for(int i=0;i<data.length;i++)
{ in_and_out.writeInt(data[i]);
}
for(long i=data.length-1;i>=0;i--) //一个int型数据占4个字节，我们从
{ in_and_out.seek(i*4); //文件的第36个字节读取最后面的一个整数，
//每隔4个字节往前读取一个整数：
System.out.print(","+in_and_out.readInt());
}
in_and_out.close();
}
catch(IOException e){}
}
}
import Java.io.*;
class Example20_11
{ public static void main(String args[])
{ try{ RandomAccessFile in=new RandomAccessFile("Example20_11.Java","rw");
long filePoint=0;
long fileLength=in.length();
while(filePoint<fileLength)
{ String s=in.readLine();
System.out.println(s);
filePoint=in.getFilePointer();
}
in.close();
}
catch(Exception e){}
}
}
import Java.io.*;
import Javax.swing.*;
import Java.awt.*;import
Java.awt.event.*;
import Javax.swing.border.*;
class InputArea extends Panel
implements ActionListener
{ File f=null;
RandomAccessFile out;
Box baseBox ,boxV1,boxV2;
TextField name,email,phone;
Button button;
InputArea(File f)
{ setBackground(Color.cyan);
this.f=f;
name=new TextField(12);
email=new TextField(12);
phone=new TextField(12);
button=new Button("录入");
button.addActionListener(this);
boxV1=Box.createVerticalBox();
boxV1.add(new Label("输入姓名"));
boxV1.add(Box.createVerticalStrut(8));
boxV1.add(new Label("输入email"));
boxV1.add(Box.createVerticalStrut(8));
boxV1.add(new Label("输入电话"));
boxV1.add(Box.createVerticalStrut(8));
boxV1.add(new Label("单击录入"));
boxV2=Box.createVerticalBox();
boxV2.add(name);
boxV2.add(Box.createVerticalStrut(8));
boxV2.add(email);
boxV2.add(Box.createVerticalStrut(8));
boxV2.add(phone);
boxV2.add(Box.createVerticalStrut(8));
boxV2.add(button);
baseBox=Box.createHorizontalBox();
baseBox.add(boxV1);
baseBox.add(Box.createHorizontalStrut(10));
baseBox.add(boxV2);
add(baseBox);
}
public void actionPerformed(ActionEvent e)
{ try{
RandomAccessFile out=new RandomAccessFile(f,"rw");
if(f.exists())
{ long length=f.length();
out.seek(length);
}
out.writeUTF("姓名:"+name.getText());
out.writeUTF("eamil:"+email.getText());
out.writeUTF("电话:"+phone.getText());
out.close();
}
catch(IOException ee){}
}
}
public class Example20_12 extends Frame implements ActionListener
{ File file=null;
MenuBar bar;
Menu fileMenu;
MenuItem 录入,显示;
TextArea show;
InputArea inputMessage;
CardLayout card=null; //卡片式布局.
Panel pCenter;
Example20_12()
{
file=new File("通讯录.txt");
录入=new MenuItem("录入");
显示=new MenuItem("显示");
bar=new MenuBar();
fileMenu=new Menu("菜单选项");
fileMenu.add(录入);
fileMenu.add(显示);
bar.add(fileMenu);
setMenuBar(bar);
录入.addActionListener(this);
显示.addActionListener(this);
inputMessage=new InputArea(file);
show=new TextArea(12,20);
card=new CardLayout();
pCenter=new Panel();
pCenter.setLayout(card);
pCenter.add("录入",inputMessage);
pCenter.add("显示",show);
add(pCenter,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setVisible(true);
setBounds(100,50,420,380);
validate();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==录入)
{
card.show(pCenter,"录入");
}
else if(e.getSource()==显示)
{ int number=1;
card.show(pCenter,"显示");
try{ RandomAccessFile in=new RandomAccessFile(file,"r");
String 姓名=null;
while((姓名=in.readUTF())!=null)
{ show.append("/n"+number+" "+姓名);
show.append(in.readUTF()); //读取email.
show.append(in.readUTF()); //读取phone
show.append("/n------------------------- ");
number++;
}
in.close();
}
catch(Exception ee){}
}
}
public static void main(String args[])
{ new Example20_12();
}
}
import Java.io.*;
public class Example20_13
{ public static void main(String args[])
{ try
{ FileOutputStream fos=new FileOutputStream("jerry.dat");
DataOutputStream out_data=new DataOutputStream(fos);
out_data.writeInt(100);out_data.writeInt(10012);
out_data.writeLong(123456);
out_data.writeFloat(3.1415926f); out_data.writeFloat(2.789f);
out_data.writeDouble(987654321.1234);
out_data.writeBoolean(true);out_data.writeBoolean(false);
out_data.writeChars("i am ookk");
}
catch(IOException e){}
try
{ FileInputStream fis=new FileInputStream("jerry.dat");
DataInputStream in_data=new DataInputStream(fis);
System.out.println(":"+in_data.readInt());//读取第1个int整数。
System.out.println(":"+in_data.readInt());//读取第2个int整数。
System.out.println(":"+in_data.readLong()); //读取long整数。
System.out.println(":"+in_data.readFloat());//读取第1个float数。
System.out.println(":"+in_data.readFloat());//读取第2个float数。
System.out.println(":"+in_data.readDouble());
System.out.println(":"+in_data.readBoolean());//读取第1个boolean。
System.out.println(":"+in_data.readBoolean());//读取第2个boolean。
char c;
while((c=in_data.readChar())!='/0') //'/0'表示空字符。
System.out.print(c);
}
catch(IOException e){}
}
}
import Java.awt.*;import Java.awt.event.*;
import Java.io.*;
public class Example20_14 extends Frame implements ActionListener
{ TextArea text=null; Button 读入=null,写出=null;
FileInputStream file_in=null; FileOutputStream file_out=null;
ObjectInputStream object_in=null; //对象输入流。
ObjectOutputStream object_out=null; //对象输出流。
Example20_14()
{ setLayout(new FlowLayout()); text=new TextArea(6,10);
读入=new Button("读入对象"); 写出=new Button("写出对象");
读入.addActionListener(this);写出.addActionListener(this);
setVisible(true); add(text);add(读入);add(写出);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
pack();setSize(300,300);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==写出)
{ try{ file_out=new FileOutputStream("tom.txt");
object_out=new ObjectOutputStream(file_out);//创建对象输出流。
object_out.writeObject(text); //写对象到文件中。
object_out.close();
}
catch(IOException event){}
}
else if(e.getSource()==读入)
{ try{ file_in=new FileInputStream("tom.txt");
object_in=new ObjectInputStream(file_in); //创建对象输入流。
TextArea temp=(TextArea)object_in.readObject();//从文件中读入对象。
temp.setBackground(Color.pink); this.add(temp);//添加该对象到窗口。
this.pack();this.setSize(600,600);
object_in.close();
}
catch(ClassNotFoundException event)
{ System.out.println("不能读出对象");
}
catch(IOException event)
{ System.out.println("can not read file");
}
}
}
public static void main(String args[])
{ Example20_14 win=new Example20_14();
}
}
import Java.io.*;
class Student implements Serializable//实现接口Serializable的Student类。
{ String name=null;double height;
Student(String name,double height)
{ this.name=name;this.height=height;
}
public void setHeight (double c)
{ this.height=c;
}
}
public class Example20_15
{ public static void main(String args[])
{ Student zhang=new Student("zhang ping",1.65);
try{ FileOutputStream file_out=new FileOutputStream("s.txt");
ObjectOutputStream object_out=new ObjectOutputStream(file_out);
object_out.writeObject(zhang);
System.out.println(zhang.name+"的身高是："+zhang.height);
FileInputStream file_in=new FileInputStream("s.txt");
ObjectInputStream object_in=new ObjectInputStream(file_in);
zhang=(Student)object_in.readObject();
zhang.setHeight(1.78); //修改身高。
System.out.println(zhang.name+"现在的身高是："+zhang.height);
}
catch(ClassNotFoundException event)
{ System.out.println("不能读出对象");
}
catch(IOException event)
{ System.out.println("can not read file"+event);
}
}
}
import Java.awt.*;import Java.io.*;import Java.awt.event.*;
public class Example20_16
{ public static void main(String args[])
{ JDK f=new JDK();
f.pack();
f.addWindowListener(new WindowAdapter() //窗口增加适配器。
{public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
f.setBounds(100,120,700,360);
f.setVisible(true);
}
}
class JDK extends Frame implements ActionListener,Runnable
{ Thread compiler=null; //负责编译的线程。
Thread run_prom=null; //负责运行程序的线程。
boolean bn=true;
CardLayout mycard;
Panel p=new Panel();
File file_saved=null;
TextArea input_text=new TextArea(),//程序输入区。
compiler_text=new TextArea(), //编译出错显示区。
dos_out_text=new TextArea(); //程序运行时，负责显示在dos窗口的输出信息。
Button button_input_text,button_compiler_text,
button_compiler,button_run_prom,button_see_doswin;
TextField input_flie_name_text=new TextField("输入被编译的文件名字.Java");
TextField run_file_name_text=new TextField("输入应用程序主类的名字");
JDK()
{ super("Java编程小软件");
mycard=new CardLayout();
compiler=new Thread(this);
run_prom=new Thread(this);
button_input_text=new Button("程序输入区(白色)");
button_compiler_text=new Button("编译结果区(粉色)");
button_compiler=new Button("编译程序");
button_run_prom=new Button("运行应用程序");
button_see_doswin=new Button("查看应用程序运行时在dos窗口输出的信息");
p.setLayout(mycard);
p.add("input",input_text);p.add("compiler",compiler_text);
p.add("dos",dos_out_text);
add(p,"Center");
add( button_see_doswin,"South");
compiler_text.setBackground(Color.pink);
dos_out_text.setBackground(Color.blue);
Panel p1=new Panel();p1.setLayout(new GridLayout(4,2));
p1.add(new Label("按扭输入源程序："));p1.add(button_input_text);
p1.add(new Label("按扭看编译结果："));p1.add(button_compiler_text);
p1.add(input_flie_name_text); p1.add(button_compiler);
p1.add(run_file_name_text); p1.add(button_run_prom);
add(p1,BorderLayout.NORTH);
button_input_text.addActionListener(this);
button_compiler_text.addActionListener(this);
button_compiler.addActionListener(this);
button_run_prom.addActionListener(this);
button_see_doswin.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button_input_text)
{ mycard.show(p,"input");
}
else if(e.getSource()==button_compiler_text)
{ mycard.show(p,"compiler");
}
else if(e.getSource()==button_see_doswin)
{ mycard.show(p,"dos");
}
else if(e.getSource()==button_compiler)
{ if(!(compiler.isAlive()))
{ compiler=new Thread(this);
}
try{ compiler.start();
}
catch(Exception eee){}
mycard.show(p,"compiler");
}
else if(e.getSource()==button_run_prom)
{ if(!(run_prom.isAlive()))
{ run_prom =new Thread(this);
}
try{ run_prom.start();
}
catch(Exception eee){}
mycard.show(p,"dos");
}
}
public void run()
{ if(Thread.currentThread()==compiler)
{ compiler_text.setText(null);
String temp=input_text.getText().trim();
byte buffer[]=temp.getBytes();
int b=buffer.length;
String flie_name=input_flie_name_text.getText().trim();
try{ file_saved=new File(flie_name);
FileOutputStream writefile=new FileOutputStream(file_saved);
writefile.write(buffer,0,b);writefile.close();
}
catch(IOException e5)
{ System.out.println("Error ");
}
try{ Runtime ce=Runtime.getRuntime();
InputStream in=
ce.exec("Javac "+flie_name).getErrorStream();
BufferedInputStream bin=new BufferedInputStream(in);
byte shuzu[]=new byte[100];
int n;boolean bn=true;
while((n=bin.read(shuzu,0,100))!=-1)
{ String s=null;
s=new String(shuzu,0,n);
compiler_text.append(s);
if(s!=null) bn=false;
}
if(bn)
{ compiler_text.append("编译正确");
}
}
catch(IOException e1){}
}
else if(Thread.currentThread()==run_prom)
{ dos_out_text.setText(null);
try{ Runtime ce=Runtime.getRuntime();
String path=run_file_name_text.getText().trim();
InputStream in=ce.exec("Java "+path).getInputStream();
BufferedInputStream bin=new BufferedInputStream(in);
byte zu[]=new byte[150];
int m;String s=null;
while((m=bin.read(zu,0,150))!=-1)
{ s=new String(zu,0,m);
dos_out_text.append(s);
}
}
catch(IOException e1){}
}
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;import Java.net.*;
public class Example21_1 extends Applet implements ActionListener
{ Button button;
URL url;
TextField text;
public void init()
{ text=new TextField(18);
button=new Button("确定");
add(new Label("输入网址:"));add(text); add(button);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button)
{ try { url=new URL(text.getText().trim());
getAppletContext().showDocument(url);
}
catch(MalformedURLException g)
{ text.setText("不正确的URL:"+url);
}
}
}
}
import Java.io.*;
import Java.net.*;
public class Client
{ public static void main(String args[])
{ String s=null;
Socket mysocket;
DataInputStream in=null;
DataOutputStream out=null;
try{
mysocket=new Socket("localhost",4331);
in=new DataInputStream(mysocket.getInputStream());
out=new DataOutputStream(mysocket.getOutputStream());
out.writeUTF("你好！");//通过 out向"线路"写入信息。
while(true)
{
s=in.readUTF();//通过使用in读取服务器放入"线路"里的信息。堵塞状态，
//除非读取到信息。
out.writeUTF(":"+Math.random());
System.out.println("客户收到:"+s);
Thread.sleep(500);
}
}
catch(IOException e)
{ System.out.println("无法连接");
}
catch(InterruptedException e){}
}
}
import Java.io.*;import Java.net.*;
public class Server
{ public static void main(String args[])
{ ServerSocket server=null;
Socket you=null;String s=null;
DataOutputStream out=null;DataInputStream in=null;
try{ server=new ServerSocket(4331);}
catch(IOException e1){System.out.println("ERRO:"+e1);}
try{ you=server.accept();
in=new DataInputStream(you.getInputStream());
out=new DataOutputStream(you.getOutputStream());
while(true)
{
s=in.readUTF();// 通过使用in读取客户放入"线路"里的信息。堵塞状态，
//除非读取到信息。
out.writeUTF("你好:我是服务器");//通过 out向"线路"写入信息.
out.writeUTF("你说的数是:"+s);
System.out.println("服务器收到:"+s);
Thread.sleep(500);
}
}
catch(IOException e)
{ System.out.println(""+e);
}
catch(InterruptedException e){}
}
}
import Java.net.*;import Java.io.*;
import Java.awt.*;import Java.awt.event.*;
import Java.applet.*;
public class Computer_client extends Applet implements Runnable,ActionListener
{ Button 计算;TextField 输入三边长度文本框,计算结果文本框;
Socket socket=null;
DataInputStream in=null; DataOutputStream out=null;
Thread thread;
public void init()
{ setLayout(new GridLayout(2,2));
Panel p1=new Panel(),p2=new Panel();
计算=new Button(" 计算");
输入三边长度文本框=new TextField(12);计算结果文本框=new TextField(12);
p1.add(new Label("输入三角形三边的长度,用逗号或空格分隔:"));
p1.add( 输入三边长度文本框);
p2.add(new Label("计算结果："));p2.add(计算结果文本框);p2.add(计算);
计算.addActionListener(this);
add(p1);add(p2);
}
public void start()
{ try
{ //和小程序所驻留的服务器建立套接字连接：
socket = new Socket(this.getCodeBase().getHost(), 4331);
in =new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
}
catch (IOException e){}
if(thread == null)
{ thread = new Thread(this);
thread.start();
}
}
public void run()
{ String s=null;
while(true)
{ try{ s=in.readUTF();//堵塞状态，除非读取到信息。
计算结果文本框.setText(s);
}
catch(IOException e)
{ 计算结果文本框.setText("与服务器已断开");
break;
}
}
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==计算)
{ String s=输入三边长度文本框.getText();
if(s!=null)
{ try { out.writeUTF(s);
}
catch(IOException e1){}
}
}
}
}
import Java.io.*;import Java.net.*;
import Java.util.*;import Java.sql.*;
public class Computer_server
{ public static void main(String args[])
{ ServerSocket server=null;Server_thread thread;
Socket you=null;
while(true)
{ try{ server=new ServerSocket(4331);
}
catch(IOException e1)
{ System.out.println("正在监听"); //ServerSocket对象不能重复创建。
}
try{ you=server.accept();
System.out.println("客户的地址:"+you.getInetAddress());
}
catch (IOException e)
{ System.out.println("正在等待客户");
}
if(you!=null)
{ new Server_thread(you).start(); //为每个客户启动一个专门的线程。
}
else
{ continue;
}
}
}
}
class Server_thread extends Thread
{ Socket socket;Connection Con=null;Statement Stmt=null;
DataOutputStream out=null;DataInputStream in=null;int n=0;
String s=null;
Server_thread(Socket t)
{ socket=t;
try { in=new DataInputStream(socket.getInputStream());
out=new DataOutputStream(socket.getOutputStream());
}
catch (IOException e)
{}
}
public void run()
{ while(true)
{ double a[]=new double[3] ;int i=0;
try{ s=in.readUTF();堵塞状态，除非读取到信息。
StringTokenizer fenxi=new StringTokenizer(s," ,");
while(fenxi.hasMoreTokens())
{ String temp=fenxi.nextToken();
try{ a[i]=Double.valueOf(temp).doubleValue();i++;
}
catch(NumberFormatException e)
{ out.writeUTF("请输入数字字符");
}
}
double p=(a[0]+a[1]+a[2])/2.0;
out.writeUTF(" "+Math.sqrt(p*(p-a[0])*(p-a[1])*(p-a[2])));
sleep(2);
}
catch(InterruptedException e){}
catch (IOException e)
{ System.out.println("客户离开");
break;
}
}
}
}
import Java.net.*;
public class DomainName
{ public static void main(String args[])
{ try{ InetAddress address_1=InetAddress.getByName("www.sina.com.cn");
System.out.println(address_1.toString());
InetAddress address_2=InetAddress.getByName("166.111.222.3");
System.out.println(address_2.toString());
}
catch(UnknownHostException e)
{ System.out.println("无法找到 www.sina.com.cn");
}
}
}
import Java.net.*;
public class DomainName
{ public static void main(String args[])
{ try{ InetAddress address=InetAddress.getByName("www.yahoo.com");
String domain_name=address.getHostName();//获取 address所含的域名。
String IP_name=address.getHostAddress(); //获取 address所含的IP地址。
System.out.println(domain_name);
System.out.println(IP_name);
}
catch(UnknownHostException e)
{ System.out.println("无法找到 www.yahoo.com");
}
}
}
import Java.net.*;
public class DomainName
{ public static void main(String args[])
{ try{ InetAddress address=InetAddress.getLocalHost();
String domain_name=address.getHostName();//获取 address所含的域名。
String IP_name=address.getHostAddress();//获取 address所含的IP地址。
System.out.println(domain_name);
System.out.println(IP_name);
}
catch(UnknownHostException e){}
}
}
import Java.net.*;import Java.awt.*; import Java.awt.event.*;
class Shanghai_Frame extends Frame implements Runnable,ActionListener
{ TextField out_message=new TextField("发送数据到北京：");
TextArea in_message=new TextArea();
Button b=new Button("发送数据包到北京");
Shanghai_Frame()
{ super("我是上海");
setSize(200,200);setVisible(true);
b.addActionListener(this);
add(out_message,"South");add(in_message,"Center");add(b,"North");
Thread thread=new Thread(this);
thread.start();//线程负责接收数据包
}
//点击按扭发送数据包：
public void actionPerformed(ActionEvent event)
{ byte buffer[]=out_message.getText().trim().getBytes();
try{ InetAddress address=InetAddress.getByName("localhost");
//数据包的目标端口是888(那么收方(北京)需在这个端口接收):
DatagramPacket data_pack=
new DatagramPacket(buffer,buffer.length, address,888);
DatagramSocket mail_data=new DatagramSocket();
in_message.append("数据报目标主机地址:"+data_pack.getAddress()+"/n");
in_message.append("数据报目标端口是:"+data_pack.getPort()+"/n");
in_message.append("数据报长度:"+data_pack.getLength()+"/n");
mail_data.send(data_pack);
}
catch(Exception e){}
}
//接收数据包：
public void run()
{ DatagramPacket pack=null;
DatagramSocket mail_data=null;
byte data[]=new byte[8192];
try{
pack=new DatagramPacket(data,data.length);
//使用端口666来接收数据包(因为北京发来的数据报的目标端口是666)。
mail_data=new DatagramSocket(666);
}
catch(Exception e){}
while(true)
{ if(mail_data==null) break;
else
try{ mail_data.receive(pack);
int length=pack.getLength(); //获取收到的数据的实际长度。
InetAddress adress=pack.getAddress();//获取收到的数据包的始发地址。
int port=pack.getPort();//获取收到的数据包的始发端口。
String message=new String(pack.getData(),0,length);
in_message.append("收到数据长度："+length+"/n");
in_message.append("收到数据来自："+adress+"端口："+port+"/n");
in_message.append("收到数据是："+message+"/n");
}
catch(Exception e){}
}
}
}
public class Shanghai
{ public static void main(String args[])
{ Shanghai_Frame shanghai_win=new Shanghai_Frame();
shanghai_win.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
shanghai_win.pack();
}
}
import Java.net.*;import Java.awt.*; import Java.awt.event.*;
class Beijing_Frame extends Frame implements Runnable,ActionListener
{ TextField out_message=new TextField("发送数据到上海：");
TextArea in_message=new TextArea();
Button b=new Button("发送数据包到上海");
Beijing_Frame()
{ super("我是北京");
setSize(200,200);setVisible(true);
b.addActionListener(this);
add(out_message,"South");add(in_message,"Center");add(b,"North");
Thread thread=new Thread(this);
thread.start();//线程负责接收数据包
}
//点击按扭发送数据包：
public void actionPerformed(ActionEvent event)
{ byte buffer[]=out_message.getText().trim().getBytes();
try{ InetAddress address=InetAddress.getByName("localhost");
//数据包的目标端口是666(那么收方(上海)需在这个端口接收):
DatagramPacket data_pack=
new DatagramPacket(buffer,buffer.length, address,666);
DatagramSocket mail_data=new DatagramSocket();
in_message.append("数据报目标主机地址:"+data_pack.getAddress()+"/n");
in_message.append("数据报目标端口是:"+data_pack.getPort()+"/n");
in_message.append("数据报长度:"+data_pack.getLength()+"/n");
mail_data.send(data_pack);
}
catch(Exception e){}
}
public void run()
{ DatagramSocket mail_data=null;
byte data[]=new byte[8192];
DatagramPacket pack=null;
try{
pack=new DatagramPacket(data,data.length);
//使用端口888来接收数据包(因为上海发来的数据报的目标端口是888)。
mail_data=new DatagramSocket(888);
}
catch(Exception e){}
while(true)
{ if(mail_data==null) break;
else
try{ mail_data.receive(pack);
int length=pack.getLength(); //获取收到的数据的实际长度。
InetAddress adress=pack.getAddress();//获取收到的数据包的始发地址。
int port=pack.getPort();//获取收到的数据包的始发端口。
String message=new String(pack.getData(),0,length);
in_message.append("收到数据长度："+length+"/n");
in_message.append("收到数据来自："+adress+"端口："+port+"/n");
in_message.append("收到数据是："+message+"/n");
}
catch(Exception e){}
}
}
}
public class Beijing
{ public static void main(String args[])
{ Beijing_Frame beijing_win=new Beijing_Frame();
beijing_win.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
beijing_win.pack();
}
}
import Java.net.*;
public class BroadCast extends Thread
{ String s="天气预报,最高温度32度,最低温度25度";
int port=5858; //组播的端口.
InetAddress group=null; //组播组的地址.
MulticastSocket socket=null; //多点广播套接字.
BroadCast()
{try
{
group=InetAddress.getByName("239.255.8.0"); //设置广播组的地址为239.255.8.0。
socket=new MulticastSocket(port); //多点广播套接字将在port端口广播。
socket.setTimeToLive(1); //多点广播套接字发送数据报范围为本地网络。
socket.joinGroup(group); //加入广播组,加入group后,socket发送的数据报，
//可以被加入到group中的成员接收到。
}
catch(Exception e)
{ System.out.println("Error: "+ e);
}
}
public void run()
{ while(true)
{ try
{ DatagramPacket packet=null; //待广播的数据包。
byte data[]=s.getBytes();
packet=new DatagramPacket(data,data.length,group,port);
System.out.println(new String(data));
socket.send(packet); //广播数据包。
sleep(2000);
}
catch(Exception e)
{ System.out.println("Error: "+ e);
}
}
}
public static void main(String args[])
{
new BroadCast().start();
}
}
import Java.net.*;import Java.awt.*;
import Java.awt.event.*;
public class Receive extends Frame implements Runnable,ActionListener
{ int port; //组播的端口.
InetAddress group=null; //组播组的地址.
MulticastSocket socket=null; //多点广播套接字.
Button 开始接收,停止接收;
TextArea 显示正在接收内容,显示已接收的内容;
Thread thread; //负责接收信息的线程.
boolean 停止=false;
public Receive()
{ super("定时接收信息");
thread=new Thread(this);
开始接收=new Button("开始接收");
停止接收=new Button("停止接收");
停止接收.addActionListener(this);
开始接收.addActionListener(this);
显示正在接收内容=new TextArea(10,10);
显示正在接收内容.setForeground(Color.blue);
显示已接收的内容=new TextArea(10,10);
Panel north=new Panel();
north.add(开始接收);
north.add(停止接收);
add(north,BorderLayout.NORTH);
Panel center=new Panel();
center.setLayout(new GridLayout(1,2));
center.add(显示正在接收内容);
center.add(显示已接收的内容);
add(center,BorderLayout.CENTER);
validate();
port=5858; //设置组播组的监听端口。
try{
group=InetAddress.getByName("239.255.8.0"); /设置广播组的地址为239.255.8.0。
socket=new MulticastSocket(port); //多点广播套接字将在port端口广播。
socket.joinGroup(group); //加入广播组,加入group后,socket发送的数据报,
//可以被加入到group中的成员接收到。
}
catch(Exception e)
{ }
setBounds(100,50,360,380);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==开始接收)
{ 开始接收.setBackground(Color.blue);
停止接收.setBackground(Color.gray);
if(!(thread.isAlive()))
{ thread=new Thread(this);
}
try{ thread.start();
停止=false;
}
catch(Exception ee) {}
}
if(e.getSource()==停止接收)
{ 开始接收.setBackground(Color.gray);
停止接收.setBackground(Color.blue);
thread.interrupt();
停止=true;
}
}
public void run()
{ while(true)
{byte data[]=new byte[8192];
DatagramPacket packet=null;
packet=new DatagramPacket(data,data.length,group,port); //待接收的数据包。
try { socket.receive(packet);
String message=new String(packet.getData(),0,packet.getLength());
显示正在接收内容.setText("正在接收的内容:/n"+message);
显示已接收的内容.append(message+"/n");
}
catch(Exception e) {}
if(停止==true)
{ break;
}
}
}
public static void main(String args[])
{
new Receive();
}
}
import Java.applet.*;
import Java.awt.*;
public class Example22_1 extends Applet
{ Image img;
public void start()
{ img=getImage(getCodeBase(),"vintdev.jpg");
}
public void paint(Graphics g)
{ g.drawImage(img,2,2,this);
}
}
import Java.applet.*;import Java.awt.*;
public class Example22_2 extends Applet
{ Image img;int height,width;
public void start()
{ img=getImage(getCodeBase(),"vintdev.jpg");
height=img.getHeight(this);width=img.getWidth(this);
}
public void paint(Graphics g)
{ g.drawImage(img,22,72,width,height,this);
g.drawImage(img,2+width,2+height,width,height,this);
}
}
import Java.applet.*;import Java.awt.*;
public class Wuqiong extends Applet
{ static Image img; Canvas canvas; static int width,height;
public void init()
{ setLayout(new GridLayout(3,1));add(new Button("祝好"));
add(new Button("进步"));
canvas=new Mycanvas(); add(canvas);
width=getSize().width;height=getSize().height;
}
public void start()
{ img=getImage(getCodeBase(),"Tom1.jpg");
}
}
class Mycanvas extends Canvas
{ public void paint(Graphics g)
{ g.drawImage(Wuqiong.img,0,0,Wuqiong.width,(Wuqiong.height)/3,this);
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example22_4 extends Applet implements MouseListener
{ final int number=38; int count=0;
Image[] card=new Image[number];
public void init()
{ addMouseListener(this);
for(int i=0;i<number;i++)
{ card[i]=getImage(getCodeBase(),"jiafei"+i+".jpg");
}
}
public void paint(Graphics g)
{ if((card[count])!=null)
g.drawImage(card[count],10,10,
card[count].getWidth(this),card[count].getHeight(this),this);
}
public void mousePressed(MouseEvent e)
{ count++;
if(count>number)
count=0;
repaint();
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example22_5 extends Applet implements Runnable
{ final int number=59; int count=0;
Thread mythread;
Image[] pic=new Image[number];
public void init()
{ for(int i=0;i<number;i++)
{ pic[i]=getImage(getCodeBase(),"tom"+i+".jpg");
}
}
public void start()
{ mythread=new Thread(this);
mythread.start();
}
public void stop()
{ mythread=null;
}
public void run()
{ while(true)
{ if(count>59)
count=0;
repaint();
count++;
try{ mythread.sleep(200);
}
catch(InterruptedException e){}
}
}
public void paint(Graphics g)
{ if((pic[count])!=null)
g.drawImage(pic[count],10,10,
pic[count].getWidth(this),pic[count].getHeight(this),this);
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
class Imagecanvas extends Canvas
{ Toolkit tool; Image myimage;
Imagecanvas()
{ setSize(200,200);
tool=getToolkit();//得到一个Toolkit对象。
myimage=tool.getImage("apple.jpg");//由tool负责获取图像。
}
public void paint(Graphics g)
{
g.drawImage(myimage,10,10,myimage.getWidth(this),myimage.getHeight(this),this);
}
}
public class Example22_6
{ public static void main(String args[])
{Imagecanvas canvas=new Imagecanvas();
Frame frame=new Frame();
frame.setLayout(new BorderLayout());
frame.add(canvas,"Center"); frame.add("South",new Label());
frame.add("West",new Label()); frame.add("North",new Label());
frame.setSize(400,300);frame.setVisible(true);
frame.pack();
frame.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
}
}
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
class Imagecanvas extends Canvas implements MouseListener
{final int number=59; int count=0; Toolkit tool;
Image[] card=new Image[number];
Imagecanvas()
{ getSize(); tool=getToolkit(); addMouseListener(this);
for(int i=0;i<number;i++)
{card[i]=tool.getImage("tom"+i+".jpg");
}
}
public void paint(Graphics g)
{if((card[count])!=null)
g.drawImage(card[count],10,10,
card[count].getWidth(this),card[count].getHeight(this),this);
}
public Dimension getPreferredSize()
{return new Dimension(160,100);
}
public void mousePressed(MouseEvent e)
{ count++;
if(count>number-1)
count=0;
repaint();
}
public void mouseReleased(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
}
public class Example226
{ public static void main(String args[])
{Imagecanvas canvas=new Imagecanvas();
Frame frame=new Frame(); frame.setLayout(new BorderLayout());
frame.add(canvas,"Center");
frame.add("South",new Label());frame.add("West",new Label());
frame.add("North",new Label());
frame.setSize(400,300);frame.setVisible(true); frame.pack();
frame.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
}
}
import Java.awt.*;import Java.awt.event.*;
public class Frame_Icon
{ public static void main(String args[])
{ Frame frame=new Frame();
Toolkit tool= frame.getToolkit();//得到一个Toolkit对象。
Image myimage=tool.getImage("apple.jpg");//由tool负责获取图像。
//设置窗口的图标是myimage指定的图象apple.jpg：
frame.setIconImage(myimage);
frame.setSize(400,300);frame.setVisible(true);
frame.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
}
import Java.sql.*;
public class Example23_1
{ public static void main(String args[])
{ Connection con;Statement sql; ResultSet rs;
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{ System.out.println(""+e);
}
try
{
con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
rs=sql.executeQuery("SELECT * FROM chengjibiao");
while(rs.next())
{ String number=rs.getString(1);
String name=rs.getString(2);
Date date=rs.getDate(3);
int math=rs.getInt("数学");
int physics=rs.getInt("物理");
int english=rs.getInt("英语");
System.out.println("学号："+number);
System.out.print(" 姓名："+name);
System.out.print(" 出生："+date);
System.out.print(" 数学："+math);
System.out.print(" 物理："+physics);
System.out.print(" 英语："+english);
}
con.close();
}
catch(SQLException e1) {}
}
}
import Java.sql.*;
public class Example23_2
{ public static void main(String args[])
{ Connection con;Statement sql; ResultSet rs;
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{ System.out.println(""+e);
}
try
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");
while(rs.next())
{ String name=rs.getString(1);
int english=rs.getInt(2);
System.out.println(" 姓名："+name);
System.out.print(" 英语："+english);
}
con.close();
}
catch(SQLException e1) {}
}
}
import Java.awt.*;import Java.net.*;
import Java.sql.*;import Java.awt.event.*;
class DataWindow extends Frame implements ActionListener
{ TextField englishtext;TextArea chinesetext; Button button;
DataWindow()
{ super("英汉小词典");
setBounds(150,150,300,120);
setVisible(true);
englishtext=new TextField(16);
chinesetext=new TextArea(5,10);
button=new Button("确定");
Panel p1=new Panel(),p2=new Panel();
p1.add(new Label("输入要查询的英语单词:"));
p1.add(englishtext);
p2.add(button);
add(p1,"North");add(p2,"South");add(chinesetext,"Center");
button.addActionListener(this);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button)
{ chinesetext.setText("查询结果");
try{ Liststudent();
}
catch(SQLException ee) {}
}
}
public void Liststudent() throws SQLException
{ String cname,ename;
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
Connection Ex1Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
Statement Ex1Stmt=Ex1Con.createStatement();
ResultSet rs=Ex1Stmt.executeQuery("SELECT * FROM 表1 ");
boolean boo=false;
while((boo=rs.next())==true)
{ ename=rs.getString("单词");
cname=rs.getString("解释");
if(ename.equals(englishtext.getText()))
{
chinesetext.append('/n'+cname);
break;
}
}
Ex1Con.close();
if(boo==false)
{ chinesetext.append('/n'+"没有该单词");
}
}
}
public class Example23_3
{ public static void main(String args[])
{ DataWindow window=new DataWindow();window.pack();
}
}
import Java.sql.*;
public class Example23_4
{ public static void main(String args[])
{ Connection con;Statement sql; ResultSet rs;
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{ System.out.println(""+e);
}
try
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
sql=
con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
//返回可滚动的结果集：
rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");
//将游标移动到最后一行：
rs.last();
//获取最后一行的行号：
int number=rs.getRow();
System.out.println("该表共有"+number+"条记录");
//为了逆序输出记录，需将游标移动到最后一行之后：
rs.afterLast();
while(rs.previous())
{ String name=rs.getString(1);
int english=rs.getInt("英语");
System.out.println(" 姓名："+name);
System.out.print(" 英语："+english);
}
System.out.println("单独输出第5条记录:");
rs.absolute(5);
String name=rs.getString(1);
int english=rs.getInt("英语");
System.out.println(" 姓名："+name);
System.out.print(" 英语："+english);
con.close();
}
catch(SQLException e1) {}
}
}
import Java.sql.*;
public class Example23_5
{ public static void main(String args[])
{ Connection con;Statement sql; ResultSet rs;
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{ System.out.println(""+e);
}
try
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
String condition="SELECT 姓名,英语 FROM chengjibiao ORDER BY 英语";
rs=sql.executeQuery(condition);
while(rs.next())
{ String name=rs.getString(1);
int english=rs.getInt(2);
System.out.println(" 姓名："+name);
System.out.print(" 英语："+english);
}
con.close();
}
catch(SQLException e1) { System.out.print(e1);}
}
}
import Java.sql.*;
public class Example23_6
{ public static void main(String args[])
{ Connection con;Statement sql; ResultSet rs;
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{ System.out.println(""+e);
}
try
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
rs=sql.executeQuery("SELECT 姓名,数学 FROM chengjibiao WHERE 姓名 LIKE '%小%' ");
while(rs.next())
{ String name=rs.getString(1);
int math=rs.getInt(2);
System.out.println(" 姓名："+name);
System.out.print(" 数学："+math);
}
con.close();
}
catch(SQLException e1) { System.out.print(e1);}
}
}
import Java.awt.*;
import Java.sql.*;import Java.awt.event.*;
class DataWindow extends Frame implements ActionListener
{ TextField 待查英文单词_文本条,汉语解释_文本条,
更新英文单词_文本条,更新汉语解释_文本条,
填加英文单词_文本条,填加汉语解释_文本条;
Button 查询按扭,更新按扭,填加按扭;
int 查询记录=0;
Connection Con=null;Statement Stmt=null;
DataWindow()
{ super("英汉小词典");
setBounds(150,150,300,120);
setVisible(true);setLayout(new GridLayout(3,1));
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");}
catch(ClassNotFoundException e){}
try{
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
Stmt=Con.createStatement();
}
catch(SQLException ee) {}
待查英文单词_文本条=new TextField(16);
汉语解释_文本条=new TextField(16);
更新英文单词_文本条=new TextField(16);
更新汉语解释_文本条=new TextField(16);
填加英文单词_文本条=new TextField(16);
填加汉语解释_文本条=new TextField(16);
查询按扭=new Button("查询");
更新按扭=new Button("更新");
填加按扭=new Button("填加");
Panel p1=new Panel(),p2=new Panel(),p3=new Panel();
p1.add(new Label("输入要查询的英语单词:"));
p1.add( 待查英文单词_文本条);
p1.add(new Label("显示英语单词的汉语解释:"));
p1.add(汉语解释_文本条);
p1.add(查询按扭);
p2.add(new Label("输入英语单词:"));p2.add( 更新英文单词_文本条);
p2.add(new Label("输入该单词更新的汉语解释:"));
p2.add(更新汉语解释_文本条);
p2.add(更新按扭);
p3.add(new Label("输入英语单词:"));p3.add( 填加英文单词_文本条);
p3.add(new Label("输入汉语解释:"));p3.add(填加汉语解释_文本条);
p3.add(填加按扭);
add(p1);add(p2);add(p3);
查询按扭.addActionListener(this);更新按扭.addActionListener(this);
填加按扭.addActionListener(this);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{setVisible(false);System.exit(0); } } );
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==查询按扭)
{ 查询记录=0;
try{ 查询();}
catch(SQLException ee) {}
}
else if(e.getSource()==更新按扭)
{ try{ 更新();}
catch(SQLException ee) {}
}
else if(e.getSource()==填加按扭)
{ try{ 填加();}
catch(SQLException ee) {}
}
}
public void 查询() throws SQLException
{ String cname,ename;
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
ResultSet rs=Stmt.executeQuery("SELECT * FROM 表1 ");
while (rs.next())
{ ename=rs.getString("单词"); cname=rs.getString("解释");
if(ename.equals( 待查英文单词_文本条.getText().trim()))
{ 汉语解释_文本条.setText(cname);查询记录=1; break;
}
}
Con.close();
if(查询记录==0)
{ 汉语解释_文本条.setText("没有该单词");
}
}
public void 更新() throws SQLException
{ String s1="'"+更新英文单词_文本条.getText().trim()+"'",
s2="'"+更新汉语解释_文本条.getText().trim()+"'";
String temp="UPDATE 表1 SET 解释 ="+s2+" WHERE 单词 = "+s1 ;
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
Stmt.executeUpdate(temp); Con.close();
}
public void 填加() throws SQLException
{ String s1="'"+填加英文单词_文本条.getText().trim()+"'",
s2="'"+填加汉语解释_文本条.getText().trim()+"'";
String temp="INSERT INTO 表1 VALUES ("+s1+","+s2+")";
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
Stmt.executeUpdate(temp);
Con.close();
}
}
public class Database
{ public static void main(String args[])
{DataWindow window=new DataWindow();window.pack();
}
}
import Java.net.*;import Java.io.*;
import Java.awt.*;import Java.awt.event.*;
import Java.applet.*;
public class Database_client extends Applet implements Runnable,ActionListener
{ Button 查询;TextField 英文单词_文本框,汉语解释_文本框;
Socket socket=null;
DataInputStream in=null;
DataOutputStream out=null;
Thread thread;
public void init()
{查询=new Button("查询");
英文单词_文本框=new TextField(10);汉语解释_文本框=new TextField(10);
add(new Label("输入要查询的英文单词"));add(英文单词_文本框);
add(new Label("汉语解释："));add(汉语解释_文本框);add(查询);
查询.addActionListener(this);
}
public void start()
{ try
{socket = new Socket(this.getCodeBase().getHost(), 4331);
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
}
catch (IOException e){}
if (thread == null)
{thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.start();
}
}
public void stop()
{try{out.writeUTF("客户离开");}
catch(IOException e1){}
}
public void destroy()
{try{out.writeUTF("客户离开");}
catch(IOException e1){}
}
public void run()
{String s=null;
while(true)
{ try{s=in.readUTF();
}
catch (IOException e)
{汉语解释_文本框.setText("与服务器已断开");break;
}
汉语解释_文本框.setText(s);
}
}
public void actionPerformed(ActionEvent e)
{if (e.getSource()==查询)
{ String s=英文单词_文本框.getText();
if(s!=null)
{ try{out.writeUTF(s);}
catch(IOException e1){}
}
}
}
}
import Java.io.*;import Java.net.*;
import Java.util.*;import Java.sql.*;
public class Database_server
{ public static void main(String args[])
{ ServerSocket server=null;Server_thread thread;
Socket you=null;
while(true)
{ try{ server=new ServerSocket(4331);
}
catch(IOException e1) {System.out.println("正在监听");}
try{ you=server.accept();
}
catch (IOException e)
{System.out.println("正在等待客户");
}
if(you!=null)
{new Server_thread(you).start();
}
else {continue;}
}
}
}
class Server_thread extends Thread
{ Socket socket;Connection Con=null;Statement Stmt=null;
DataOutputStream out=null;DataInputStream in=null;
String s=null;
Server_thread(Socket t)
{ socket=t;
try {in=new DataInputStream(socket.getInputStream());
out=new DataOutputStream(socket.getOutputStream());
}
catch (IOException e) {}
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{
}
try { Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
Stmt=Con.createStatement();
}
catch(SQLException ee) {}
}
public void run()
{ while(true)
{try{ s=in.readUTF();
int n=0;
ResultSet rs=
Stmt.executeQuery("SELECT * FROM 表1 WHERE 单词 ="+"'"+s+"'" );
while (rs.next())
{ String 英语单词=rs.getString("单词");
if(s.equals(英语单词))
{ out.writeUTF(rs.getString("解释")); n=1;break;
}
if(n==0) {out.writeUTF("没有此单词");}
}
sleep(45);
}
catch(Exception ee)
{ break;
}
}
}
}
第二十四章Java与多媒体
import Java.applet.*;import Java.awt.*;
import Java.awt.event.*;
public class Example24_1 extends Applet implements ActionListener
{ AudioClip clip;//声明一个音频对象
Button button_play,button_loop,button_stop;
public void init()
{ clip=getAudioClip(getCodeBase(),"1.au");
//根据程序所在的地址处的声音文件1.au创建音频对象，Applet类的
// getCodeBase() 方法可以获得小程序所在的html页面的URL地址。
button_play=new Button("开始播放");button_loop=new Button("循环播放");
button_stop=new Button("停止播放");button_play.addActionListener(this);
button_stop.addActionListener(this);button_loop.addActionListener(this);
add(button_play);add(button_loop);add(button_stop);
}
public void stop()
{ clip.stop();//当离开此页面时停止播放。
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button_play)
{ clip.play();}
else if(e.getSource()==button_loop)
{ clip.loop();}
if(e.getSource()==button_stop)
{ clip.stop();}
}
}
import Java.applet.*;import Java.awt.*;import Java.awt.event.*;
public class Example24_2 extends Applet implements ActionListener,Runnable,ItemListener
{ AudioClip clip;//声明一个音频对象。
Choice choice;
TextField text;
Thread thread;
String item=null;
Button button_play,button_loop,button_stop;
public void init()
{ choice=new Choice();
thread=new Thread(this);
int N=Integer.parseInt(getParameter("总数"));
for(int i=1;i<=N;i++)
{ choice.add(getParameter(String.valueOf(i)));
}
button_play=new Button("开始播放");
button_loop=new Button("循环播放");
button_stop=new Button("停止播放");
text=new TextField(12);
button_play.addActionListener(this);
button_stop.addActionListener(this);
button_loop.addActionListener(this);
choice.addItemListener(this);
add(choice);
add(button_play);add(button_loop);add(button_stop); add(text);
button_play.setEnabled(false);
button_loop.setEnabled(false);
}
public void itemStateChanged(ItemEvent e)
{ item=choice.getSelectedItem();
int index=item.indexOf(":");
item=item.substring(index+1).trim();
if(!(thread.isAlive()))
{ thread=new Thread(this);
}
try {
thread.start();
}
catch(Exception exp)
{ text.setText("正在下载音频文件");
}
}
public void stop()
{ clip.stop();
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button_play)
{ clip.play();
}
else if(e.getSource()==button_loop)
{ clip.loop();
}
else if(e.getSource()==button_stop)
{ clip.stop();
button_play.setEnabled(false);
button_loop.setEnabled(false);
}
}
public void run()
{
clip=getAudioClip(getCodeBase(),item);
text.setText("请稍等...");
if(clip!=null)
{ button_play.setEnabled(true);
button_loop.setEnabled(true);
text.setText("您可以播放了");
}
}
}
import Java.applet.*;import Java.awt.*;
import Java.net.*;import Java.awt.event.*;
import Java.io.*;import Javax.media.*;
public class Example24_3 extends Applet
implements ControllerListener,Runnable,ItemListener
{ Player player;
String str;
Thread mythread;
Choice choice;
Component visualComponent,controlComponent,progressBar;
String mediaFile;
URL mediaURL,codeBase;
Frame frame;
public void init()
{ str="Music01.MPG";
mythread=new Thread(this);
choice=new Choice();
choice.add("Music01.MPG");
choice.add("Music02.avi");
choice.add("Music03.avi");
choice.addItemListener(this);
codeBase=getDocumentBase();
frame=new Frame("视频系统");
frame.setSize(660,580);
frame.addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ if(player!=null)
{ player.stop();player.deallocate();
}
frame.setVisible(false);
System.exit(0);
}
});
add(choice);
}
public void stop()
{ if(player!=null)
{ player.stop();
}
}
public synchronized void controllerUpdate(ControllerEvent event)
{ player.getDuration();
if(event instanceof RealizeCompleteEvent)
{ if((visualComponent=player.getVisualComponent())!=null)
frame.add("Center",visualComponent);
if((controlComponent=player.getControlPanelComponent())!=null)
if(visualComponent!=null)
frame.add("South",controlComponent);
else
frame.add( "Center",controlComponent);
frame.validate();
frame.pack();
}
else if(event instanceof PrefetchCompleteEvent)
{ player.start();
}
}
public void itemStateChanged(ItemEvent e)
{
str=choice.getSelectedItem();
if(player==null)
{
}
else
{ player.stop();player.deallocate();
}
frame.removeAll();
frame.setVisible(true);
frame.setBounds(300,100,150,100);
frame.validate();
if(!(mythread.isAlive()))
{ mythread=new Thread(this);
}
try{
mythread.start();
}
catch(Exception ee)
{
}
}
public synchronized void run()
{ try{ mediaURL=new URL(codeBase,str);
player=Manager.createPlayer(mediaURL);player.getDuration();
if(player!=null)
{ player.addControllerListener(this);
}
else
System.out.println("failed to creat player for"+mediaURL);
}
catch(MalformedURLException e)
{ System.out.println("URL for"+mediaFile+"is invalid");
}
catch(IOException e)
{ System.out.println("URL for"+mediaFile+"is invalid");
}
catch(NoPlayerException e)
{ System.out.println("canot find a player for"+mediaURL);
}
if(player!=null)
{ player.prefetch();
}
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
public class Example25_1
{ public static void main(String args[])
{ JButton button=new JButton("轻组件按钮");
JTextArea text=new JTextArea("轻组件",20,20);
JFrame jframe=new JFrame("根窗体");
jframe.setSize(200,300);jframe.setBackground(Color.blue);
jframe.setVisible(true);jframe.pack();
jframe.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
Container contentpane=jframe.getContentPane();//获得内容面板。
contentpane.add(button,BorderLayout.SOUTH); //向内容面板加入组件。
contentpane.add(text,BorderLayout.CENTER);
jframe.pack();
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
class Mywindow extends JFrame
{ JButton button;JTextArea text;
Mywindow()
{ setSize(200,400);setVisible(true);
Container con=getContentPane(); con.setLayout(new FlowLayout());
button=new JButton("ok");text=new JTextArea(10,20);
con.add(button);con.add(text);pack();
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}
});
}
}
public class Example25_2
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
import Javax.swing.*;import Java.awt.BorderLayout;
public class Example25_3 extends JApplet
{ JButton button; JTextArea text;
public void init()
{ button=new JButton("确定");text=new JTextArea();
getContentPane().add(text,BorderLayout.CENTER); //小程序容器得到内容面板。
getContentPane().add(button,BorderLayout.WEST);//并向内容面板中添加组件。
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
class Dwindow extends JFrame //建立根窗体用的类。
{ JButton button1,button2;
Dwindow(String s)
{ super(s);
Container con=getContentPane();
button1=new JButton("打开"); button2=new JButton("关闭");
con.add(button1);con.add(button2);pack();
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);}
});
}
}
class Mydialog extends JDialog //建立对话框类。
{ JButton button1,button2;
Mydialog(JFrame F,String s) //构造方法。
{ super(F,s);
button1=new JButton("open"); button2=new JButton("close");
setSize(90,90);setVisible(true);setModal(false);
Container con=getContentPane();con.setLayout(new FlowLayout());
con.add(button1);con.add(button2);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Example25_4 extends JApplet
{ Dwindow window; Mydialog dialog; JButton button;
public void init()
{ window=new Dwindow("带对话框窗口");//创建窗口。
dialog=new Mydialog(window,"我是对话框"); //创建依赖于窗口window的对话框。
button=new JButton("ok"); getContentPane().add(button);
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
class Myframe extends JFrame implements ActionListener
{ JButton button;JTextArea text;
Myframe()
{ setSize(200,400);setVisible(true);
Container con=getContentPane();
con.setLayout(new FlowLayout());
button=new JButton("ok");text=new JTextArea(10,20);
con.add(button);con.add(text);
button.addActionListener(this);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==button)
text.setText("i am a boy,and you?");
}
}
public class Example25_5
{ public static void main(String args[])
{ Myframe fr=new Myframe();fr.pack();
}
}
import Javax.swing.*; import Java.awt.*;
class Mycanvas extends JPanel
{ public void paintComponent(Graphics g)
{ super.paintComponent(g);
g.setColor(Color.red); g.drawString("a Jpanel used as canvas",50,50);
}
}
public class Example25_6 extends JApplet
{ Mycanvas canvas; JPanel panel;JButton button;
public void init()
{ canvas=new Mycanvas();panel=new JPanel();button=new JButton("ok");
panel.add(button); Container con=getContentPane();
con.add(panel,BorderLayout.NORTH); con.add(canvas,BorderLayout.CENTER);
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
class Mywindow extends JFrame
{ JButton button;JTextArea text;JScrollPane scroll;
Mywindow()
{ setSize(200,400);setVisible(true);
Container con=getContentPane();
button=new JButton("ok");text=new JTextArea(10,20);
scroll=new JScrollPane(text);
con.add(button,BorderLayout.SOUTH);con.add(scroll,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Example25_7
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*;
class Mywindow extends JFrame
{ JButton button1,button2;JTextArea text;JSplitPane split_one,split_two;
Mywindow()
{ setSize(200,400);setVisible(true); Container con=getContentPane();
button1=new JButton("ok"); button2=new JButton("No");
text=new JTextArea("I love you,Java",10,20);
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,button1,button2);
split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,text);
con.add(split_two,BorderLayout.CENTER);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Example25_8
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
import Javax.swing.*;
import Java.awt.*;
import Java.awt.event.*;
class Mywindow extends JFrame
{ JButton button1,button2;
JInternalFrame interframe_1,
interframe_2;
Mywindow()
{ setSize(200,200); setVisible(true);
Container con=getContentPane();
con.setLayout(new GridLayout(1,2));
button1=new JButton("Boy"); button2=new JButton("Girl");
interframe_1=
new JInternalFrame("内窗体1",true,true,true,true);
interframe_1.setSize(100,100);interframe_1.setVisible(true);
interframe_1.getContentPane().add(button1);
JDesktopPane desk1=new JDesktopPane();
desk1.add(interframe_1);
interframe_2=new JInternalFrame("内窗体2",true,true,true,true);
interframe_2.setSize(300,150);interframe_2.setVisible(true);
interframe_2.getContentPane().add(button2,BorderLayout.CENTER);
interframe_2.getContentPane().add(new JLabel("ookk"),BorderLayout.NORTH);
JDesktopPane desk2=new JDesktopPane();
desk2.add(interframe_2);
con.add(desk1);con.add(desk2);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
public class Exam25_9
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
import Javax.swing.*; import Java.awt.*;
import Java.awt.event.*;
class MyWin extends JFrame
{ JButton b1,b2,b3;
public MyWin()
{ setBounds(100,100,300,200); setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
b1=new JButton("按钮1",new ImageIcon("f:/2000/a1.gif"));
b2=new JButton("按钮2",new ImageIcon("f:/2000/a2.gif"));
b3=new JButton("按钮3",new ImageIcon("f:/2000/a3.gif"));
b1.setRolloverIcon(b2.getIcon());
b2.setRolloverIcon(b3.getIcon());
b3.setRolloverIcon(b1.getIcon());
b1.setHorizontalTextPosition(AbstractButton.LEFT);
b1.setVerticalTextPosition(AbstractButton.TOP);
b2.setHorizontalTextPosition(AbstractButton.RIGHT);
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b3.setHorizontalTextPosition(AbstractButton.CENTER);
b3.setVerticalTextPosition(AbstractButton.CENTER);
Container con=getContentPane();
con.setLayout(new FlowLayout());
con.add(b1);con.add(b2); con.add(b3);
con.validate();
}
}
public class Example25_10
{ public static void main(String args[])
{ new MyWin();
}
}
import Javax.swing.*;import Java.awt.BorderLayout;
import Java.awt.event.*;import Java.awt.*;
public class Example25_11 extends JApplet implements ActionListener
{ JLabel label_1,label_2;JButton button;JTextArea text;
public void init()
{ button=new JButton("确定");text=new JTextArea();
Icon icon=new ImageIcon("tom.jpg");
label_1=new JLabel("标签1",icon,JLabel.CENTER);
label_2=new JLabel("标签2");
getContentPane().add(text,BorderLayout.CENTER);
getContentPane().add(button,BorderLayout.WEST);
getContentPane().add(label_1,BorderLayout.NORTH);
getContentPane().add(label_2,BorderLayout.SOUTH);
button.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{ button.setIcon(label_1.getIcon());
label_1.setHorizontalTextPosition(JLabel.LEFT);
}
}
import Javax.swing.*;
import Java.awt.*;
import Java.awt.event.*;
import Javax.swing.border.*;
class 候选人 extends JCheckBox
{ int 得票数=0;
候选人(String name,Icon icon)
{ super(name,icon);
}
public int 获取得票数()
{ return 得票数;
}
public void 增加票数()
{ 得票数++;
}
}
class MyWin extends JFrame implements ActionListener
{ Box baseBox,boxH,boxV;
JTextArea text;
JButton button;
候选人 候选人1, 候选人2, 候选人3;
public MyWin()
{ setBounds(100,100,300,200);
setVisible(true);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
baseBox=Box.createHorizontalBox();
boxH=Box.createHorizontalBox();
boxV=Box.createVerticalBox();
候选人1=new 候选人("张小兵",new ImageIcon("a1.gif"));
候选人2=new 候选人("李大营",new ImageIcon("a2.gif"));
候选人3=new 候选人("王中堂",new ImageIcon("a3.gif"));
候选人1.setSelectedIcon(new ImageIcon("b1.gif"));
候选人2.setSelectedIcon(new ImageIcon("b2.gif"));
候选人3.setSelectedIcon(new ImageIcon("b3.gif"));
boxH.add(候选人1); boxH.add(候选人2); boxH.add(候选人3);
text=new JTextArea();
button=new JButton("显示得票数");
button.addActionListener(this);
boxV.add(text); boxV.add(button); baseBox.add(boxH);
baseBox.add(boxV);
Container con=getContentPane();
con.setLayout(new FlowLayout());
con.add(baseBox);
con.validate();
}
public void actionPerformed(ActionEvent e)
{ text.setText(null);
if(候选人1.isSelected())
{ 候选人1.增加票数();
}
if(候选人2.isSelected())
{ 候选人2.增加票数();
}
if(候选人3.isSelected())
{ 候选人3.增加票数();
}
text.append("/n"+候选人1.getText()+":"+候选人1.获取得票数());
text.append("/n"+候选人2.getText()+":"+候选人2.获取得票数());
text.append("/n"+候选人3.getText()+":"+候选人3.获取得票数());
候选人1.setSelected(false); 候选人2.setSelected(false);
候选人3.setSelected(false);
}
}
public class Example25_12
{ public static void main(String args[])
{ new MyWin();
}
}
import Javax.swing.*;
import Java.awt.*;import Java.awt.event.*;
class Mywindow extends JFrame implements ItemListener
{ JRadioButton button1,button2,button3;ButtonGroup fruit;
JLabel label ;JScrollPane scroll;JPanel panel;JSplitPane split;
Mywindow()
{ setSize(200,400);setVisible(true);
Container con=getContentPane();
fruit=new ButtonGroup();
button1=new JRadioButton("苹果");
fruit.add(button1);
button2=new JRadioButton("香蕉");
fruit.add(button2);
button3=new JRadioButton("西瓜");
fruit.add(button3);
label=new JLabel();panel=new JPanel();
scroll=new JScrollPane(label);
panel.add(button1);panel.add(button2);panel.add(button3);
split=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,panel, scroll);
con.add(split);
button1.addItemListener(this);button2.addItemListener(this);
button3.addItemListener(this);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
public void itemStateChanged(ItemEvent e)
{if(e.getItemSelectable()==button1)
{label.setIcon(new ImageIcon("a.jpg")); }
else if(e.getItemSelectable()==button2)
{label.setIcon(new ImageIcon("b.jpg")); }
else if(e.getItemSelectable()==button3)
{label.setIcon(new ImageIcon("c.jpg")); }
}
}
public class Example25_13
{ public static void main(String args[])
{ Mywindow win=new Mywindow();win.pack();
}
}
import Javax.swing.*;import Java.awt.*;import Java.awt.event.*; import Java.net.*;
public class Example25_14 extends JApplet implements ItemListener
{ JComboBox choice1,choice2; JSplitPane split1,split2;
JLabel label; URL url;
public void init()
{ Container con=getContentPane(); String[] s={"苹果", "香蕉" ,"西瓜"};
choice1=new JComboBox(s);choice2=new JComboBox();
label=new JLabel();choice2.setEditable(true);
split1=newJSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,choice1,choice2);
split2=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,split1,label);
choice1.addItemListener(this);choice2.addItemListener(this);con.add(split2);
}
public void itemStateChanged(ItemEvent e)
{ if(e.getItemSelectable()==choice1)
{ if(choice1.getSelectedIndex()==0)
{ label.setIcon(new ImageIcon("a.jpg"));}
else if(choice1.getSelectedIndex()==1)
{ label.setIcon(new ImageIcon("b.jpg")); }
else if(choice1.getSelectedIndex()==2)
{label.setIcon(new ImageIcon("c.jpg"));}
}
else if(e.getItemSelectable()==choice2)
{ try{url=new URL((String)choice2.getSelectedItem());
label.setText("你正在连接到："+choice2.getSelectedItem());
}
catch(MalformedURLException g)
{ label.setText("不正确的URL:"+url);
}
getAppletContext().showDocument(url);
}
}
}
import Javax.swing.*;
import Javax.swing.text.*;
import Java.awt.*;
class DigitDocumnet extends PlainDocument
{ public void insertString(int offset ,String s,AttributeSet a)
{ char c=s.charAt(0);
if ((c<='9'&&c>='0')||(c=='.'))
{ try {super.insertString(offset,s,a);}
catch(BadLocationException e){}
}
}
}
public class DigitText extends JApplet
{ JTextField text=null;
DigitDocumnet document=new DigitDocumnet();
public void init()
{ text=new JTextField(30);
Container con= getContentPane();
con.setLayout(new FlowLayout());
text.setDocument(document);
con.add(text);
}
}
import Javax.swing.*;
import Javax.swing.text.*;
import Java.awt.*;
public class Example25_16 extends JApplet
{ JTextPane textpane;
public void init()
{ textpane=new JTextPane();//创建文本窗格。
getContentPane().add(textpane);
}
}
import Javax.swing.*;import Javax.swing.text.*;
import Java.awt.*;
public class Example25_17 extends JApplet
{ JTextPane textpane;
MutableAttributeSet center_align,char_style;
public void init()
{ textpane=new JTextPane();//创建文本窗格。
JScrollPane scroll=
new ScrollPane(textpane,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
center_align=new SimpleAttributeSet();
char_style=new SimpleAttributeSet(); //创建属性对象。
StyleConstants.setAlignment(center_align,StyleConstants.ALIGN_CENTER);
StyleConstants.setFontFamily( char_style,"Serif");
StyleConstants.setFontSize(char_style,70);
StyleConstants.setForeground(char_style,Color.red);//为属性对象指定值
textpane.setParagraphAttributes(center_align,true);//文本窗格设置文本的属性
textpane.setCharacterAttributes(char_style,true);
getContentPane().add(scroll);
}
}
import Javax.swing.*;import Javax.swing.text.*;
import Java.awt.*;
public class Example25_18 extends JApplet
{ JTextPane textpane;
MutableAttributeSet center_align,char_style_1,char_style_2;
public void init()
{ textpane=new JTextPane();//创建文本窗口
JScrollPane scroll=new
JScrollPane(textpane,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
Document mydocument=textpane.getDocument();//初始化一个文档。
center_align=new SimpleAttributeSet();
char_style_1=new SimpleAttributeSet();
char_style_2=new SimpleAttributeSet();
StyleConstants.setAlignment(center_align,StyleConstants.ALIGN_CENTER);
StyleConstants.setFontFamily( char_style_1,"Courier");
StyleConstants.setFontSize(char_style_1,20);
StyleConstants.setForeground(char_style_1,Color.red);
StyleConstants.setFontFamily( char_style_2,"Serif");
StyleConstants.setFontSize(char_style_2,14);
StyleConstants.setForeground(char_style_2,Color.blue);
textpane.setParagraphAttributes(center_align,true);
textpane.setCharacterAttributes(char_style_1,true);
try{ textpane.insertIcon(new ImageIcon("a.jpg"));
mydocument.insertString(mydocument.getLength(),"Lovely Apple/n",char_style_1);
}
catch(BadLocationException e) {}
textpane.setParagraphAttributes(center_align,true);
textpane.setCharacterAttributes(char_style_2,true);
try{ mydocument.insertString(mydocument.getLength(),
"I Want It/n",char_style_2);
}
catch(BadLocationException e) {}
getContentPane().add(scroll);
}
}
import Javax.swing.*;
import Javax.swing.text.*;
import Java.awt.*;import Java.io.*;
public class Example25_19 extends JApplet
{ JTextPane textpane;FileInputStream readfile;
public void init()
{ textpane=new JTextPane();//创建文本窗口
JScrollPane scroll=new JScrollPane(textpane);
try{ readfile=new FileInputStream("Example25_19.Java");
}
catch(IOException ee){}
try{textpane.read(readfile,this);
}
catch(Exception e)
{}
getContentPane().add(scroll);
}
}
import Javax.swing.*;import Java.awt.*;
import Java.awt.event.*;import Java.io.*;
class FileWin extends JFrame implements ActionListener
{ JButton button; JTextArea text;JTextPane textpane;FileInputStream readfile;
JScrollPane scroll;Container con;
JFileChooser chooser=new JFileChooser();
FileWin()
{ super("有文件选择器的窗口");
button=new JButton("打开文件选取器");
button.addActionListener(this);
textpane=new JTextPane();
scroll=new JScrollPane(textpane);
setSize(200,200); setVisible(true);
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);}} );
con=getContentPane();con.add(button,BorderLayout.NORTH);
con.add(scroll,BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==button)
{String s;
int state=chooser.showOpenDialog(null);
File file=chooser.getSelectedFile();
if(file!=null&&state==JFileChooser.APPROVE_OPTION)
{ try{ readfile=new FileInputStream(file); //建立到文件的输入流。
}
catch(IOException ee){}
try{ textpane.read(readfile,this);//从流中读取数据。
}
catch(IOException e1){}
}
}
}
}
public class Example25_20
{public static void main(String args[])
{FileWin Win=new FileWin(); Win.pack(); }
}
import Javax.swing.*;
import Java.awt.*;import Java.awt.event.*;
class TimeWin extends JFrame implements ActionListener
{ static JTextArea text1,text2; Boy boy=new Boy();
JScrollPane scroll_1,scroll_2;Container con;
Timer time_1,time_2 ; //声明2个计时器对象。
JSplitPane splitpane;
TimeWin()
{super("有计时器窗口");
time_1=new Timer(1000,this);//TimeWin对象做计时器的监视器。
time_2=new Timer(2000,boy);//Boy对象做计时器的监视器。
text1=new JTextArea(); text2=new JTextArea();
scroll_1=new JScrollPane(text1);
scroll_2=new JScrollPane(text2);
splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll_1,
scroll_2);
setSize(200,200);
setVisible(true);
con=getContentPane();con.add(splitpane);
time_1.start();time_2.start();//启动计时器。
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);}} );
}
public void actionPerformed(ActionEvent e)
{text1.append("欢迎光临！"+"/n"); }
}
class Boy implements ActionListener
{ public void actionPerformed(ActionEvent e)
{ TimeWin.text2.append("再见！"+"/n"); }
}
public class Example25_21
{public static void main(String args[])
{TimeWin Win=new TimeWin(); Win.pack(); }
}
import Javax.swing.*;import Java.awt.*;
import Java.awt.event.*;
class BarWin extends JFrame implements ActionListener
{ Timer time_1; int sum=0,i=1;
JProgressBar p_bar;Container con;
BarWin()
{super("窗口");
time_1=new Timer(1000,this);//TimeWin对象做计时器的监视器，每
//1000毫秒震铃一次。
p_bar=new JProgressBar(0,55);
p_bar.setBackground(Color.white);
p_bar.setStringPainted(true);
setSize(200,200);
setVisible(true);
con=getContentPane();con.add(p_bar,BorderLayout.NORTH);
time_1.start();
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);}} );
}
public void actionPerformed(ActionEvent e)
{ sum=sum+i;
p_bar.setValue(sum);//吃掉sum/55
i=i+1;
if(sum>=55)
time_1.stop();
}
}
public class Example25_22
{public static void main(String args[])
{BarWin Win=new BarWin(); Win.pack(); }
}
import Javax.swing.*;
import Java.io.*;import Java.awt.*;import Java.awt.event.*;
public class Example25_23
{ public static void main(String args[])
{ byte b[]=new byte[30];
JTextArea text=new JTextArea(20,20);
JFrame jframe=new JFrame();
jframe.setSize(200,300);jframe.setBackground(Color.blue);
jframe.setVisible(true);
jframe.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);} });
Container contentpane=jframe.getContentPane();
contentpane.add(text,BorderLayout.CENTER);
try{ FileInputStream input=new FileInputStream("Example25_23.Java");
ProgressMonitorInputStream input_progress=
new ProgressMonitorInputStream(contentpane,"读取Java文件",input);
ProgressMonitor p=input_progress.getProgressMonitor();//获得进度条。
while(input_progress.read(b)!=-1)
{ String s=new String(b);
text.append(s);
Thread.sleep(1000);//由于文件较小，为了看清进度条这里有意延缓1秒。
}
}
catch(InterruptedException e){}
catch(IOException e){}
}
}
import Javax.swing.*;import Java.awt.*;
import Java.awt.event.*;
public class Example25_24 extends JFrame implements ActionListener
{ JTable table;Object a[][];
Object name[]={"姓名","英语成绩","数学成绩","总成绩"};
JButton button;
Example25_24()
{ a=new Object[8][4];
for(int i=0;i<8;i++)
{ for(int j=0;j<4;j++)
{if(j!=0)
a[i][j]="0";
else
a[i][j]="姓名";
}
}
button=new JButton("计算每人总成绩");
table=new JTable(a,name);
button.addActionListener(this);
getContentPane().add(new JScrollPane(table),BorderLayout.CENTER);
getContentPane().add(new JLabel("修改或录入数据后,需回车确认"),BorderLayout.SOUTH);
getContentPane().add(button,BorderLayout.SOUTH);
setSize(200,200);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{ for(int i=0;i<8;i++)
{ double sum=0;
boolean boo=true;
for(int j=1;j<=2;j++)
{ try{
sum=sum+Double.parseDouble(a[i][j].toString());
}
catch(Exception ee)
{
boo=false;
table.repaint();
}
if(boo==true)
{
a[i][3]=""+sum;
table.repaint();
}
}
}
}
public static void main(String args[])
{ Example25_24 Win=new Example25_24();
}
}
import Javax.swing.*;
import Java.awt.event.*;
import Java.sql.*;
import Java.awt.*;
class ResultWin extends JFrame implements ActionListener
{ Object a[][];
Object columnName[]={"学号","姓名","出生日期","数学","物理","英语"};
JTable table;JButton button;
Container container;
String name,xuehao;Date date; int math,physics,english;
Connection con;Statement sql; ResultSet rs;
JProgressBar p_bar;
ResultWin()
{ super("数据查询");
a=new Object[30][6];
table=new JTable(a,columnName);
setSize(300,300);setVisible(true);
button=new JButton("确定");
addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{ System.exit(0);}} );
button.addActionListener(this);
p_bar=new JProgressBar(JProgressBar.VERTICAL,0,50);
p_bar.setStringPainted(true) ;
container=getContentPane();
container.add(button,BorderLayout.SOUTH);
container.add(new JScrollPane(table),BorderLayout.CENTER);
container.add(p_bar,BorderLayout.WEST);
}
public void actionPerformed(ActionEvent evt)
{if(evt.getSource()==button)
{int i=0;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); }
catch(ClassNotFoundException e){}
try
{con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
sql=con.createStatement();
rs=sql.executeQuery("SELECT * FROM chengjibiao");
while(rs.next())
{ xuehao=rs.getString(1); name=rs.getString(2);date=rs.getDate(3);
math=rs.getInt("数学"); physics=rs.getInt("物理");english=rs.getInt("英语");
a[i][0]=xuehao;a[i][1]=name;a[i][2]=date;a[i][3]=String.valueOf(math);
a[i][4]=String.valueOf(physics);a[i][5]=String.valueOf(english);
i++;
p_bar.setValue(i);p_bar.setString("查询了"+i+"条记录");
}
con.close();
}
catch(SQLException e1) {}
}
}
}
public class Example25_25
{ public static void main(String args[])
{ResultWin win=new ResultWin(); win.pack(); }
}
import Javax.swing.*;
import Java.awt.*;
import Java.awt.event.*;
public class Example24_26 extends JApplet
{ Container con;
public void init()
{con=getContentPane();
JMenuBar menubar=new JMenuBar();
con.add(menubar,BorderLayout.NORTH);
JMenu fileMenu=new JMenu("文件");
JMenu editMenu=new JMenu("编辑");
JMenu helpMenu=new JMenu("帮助");
JMenuItem item1=new JMenuItem("打开");
JMenuItem item2=new JMenuItem("保存"); //创建6个菜单项。
fileMenu.add(item1); fileMenu.add(item2);
menubar.add(fileMenu); menubar.add(editMenu);
menubar.add(helpMenu);
}
}
import Javax.swing.*;import Java.awt.*;
import Java.awt.event.*;
class ToolWin extends JFrame implements ActionListener
{ JButton button1,button2; JToolBar bar; Container con;
ToolWin()
{con=getContentPane();
setSize(300,250);setVisible(true);
Icon open_icon =new ImageIcon("open.gif");
Icon save_icon =new ImageIcon("save.gif");
button1=new JButton(open_icon); button2=new JButton(save_icon);
bar=new JToolBar();//工具条对象
bar.add(button1);bar.add(button2);
con.add(bar,BorderLayout.NORTH);
button1.addActionListener(this);
button1.setToolTipText("open");//设置组件的提示文字
button2.setToolTipText("save");
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==button1)
{JFileChooser c=new JFileChooser();
c.showOpenDialog(null);
}
}
}
public class Example25_27
{static void main(String args[])
{ToolWin win=new ToolWin() ;win.pack();}
}
import Javax.swing.*;import Javax.swing.tree.*;
import Java.awt.*;
public class Mytree extends JApplet
{ public void init()
{Container con=getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("c://");//树的根节点。
DefaultMutableTreeNode t1=new DefaultMutableTreeNode("dos");//节点。
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("Java");//节点。
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("applet");
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode("jre");
root.add(t1);root.add(t2);
t1.add(t1_1);t1.add(t1_2);//t1_1,t1_2成为t1的子节点。
JTree tree =new JTree(root); //创建根为root的树。
JScrollPane scrollpane=new JScrollPane(tree);
con.add(scrollpane);
}
}
import Javax.swing.*;
import Javax.swing.tree.*;import Java.awt.*;
import Java.awt.event.*;import Javax.swing.event.*;
public class Mytree2 extends JFrame implements TreeSelectionListener
{ JTree tree=null;JTextArea text=new JTextArea(20,20);
Mytree2()
{Container con=getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("同学通讯录");
DefaultMutableTreeNode t1=new DefaultMutableTreeNode("大学同学");
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("研究生同学");
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("董明光");
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode("李晓");
DefaultMutableTreeNode t2_1=new DefaultMutableTreeNode("王光明");
DefaultMutableTreeNode t2_2=new DefaultMutableTreeNode("代学才");
root.add(t1);root.add(t2);
t1.add(t1_1);t1.add(t1_2); t2.add(t2_1);t2.add(t2_2);
tree =new JTree(root);
JScrollPane scrollpane=new JScrollPane(text);
JSplitPane splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
true,tree,scrollpane);
tree.addTreeSelectionListener(this);
con.add(splitpane);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);} });
setVisible(true);setBounds(70,80,200,300);
}
public void valueChanged(TreeSelectionEvent e)
{ if(e.getSource()==tree)
{DefaultMutableTreeNode node=
(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{ String str=node.toString();
if(str.equals("董明光"))
{text.setText(str+":联系电话：0411-4209876");}
else if(str.equals("李晓"))
{text.setText(str+":联系电话：010-62789876");}
else if(str.equals("王光明"))
{text.setText(str+":联系电话：0430-63596677");}
else if(str.equals("代学才"))
{text.setText(str+":联系电话：020-85192789");}
}
else
{text.setText(node.getUserObject().toString());
}
}
}
}
class Example25_29
{public static void main(String args[])
{ Mytree2 win=new Mytree2();win.pack();}
}
import Javax.swing.*;import Javax.swing.tree.*;
import Java.awt.*;
public class Mytree3 extends JApplet
{ public void init()
{Container con=getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("c://");//树的根节点。
DefaultMutableTreeNode t1=new DefaultMutableTreeNode("dos");//节点。
DefaultMutableTreeNode t2=new DefaultMutableTreeNode("Java");//节点。
DefaultMutableTreeNode t1_1=new DefaultMutableTreeNode("wps");
DefaultMutableTreeNode t1_2=new DefaultMutableTreeNode("epg");
DefaultMutableTreeNode t2_1=new DefaultMutableTreeNode("applet");
DefaultMutableTreeNode t2_2=new DefaultMutableTreeNode("jre");
root.add(t1);root.add(t2);
t1.add(t1_1);t1.add(t1_2);
t2.add(t2_1);t2.add(t2_2);
JTree tree =new JTree(root); //创建根为root的树。
DefaultTreeCellRenderer render=new DefaultTreeCellRenderer();
render.setLeafIcon(new ImageIcon("leaf.gif"));
render.setBackground(Color.yellow);
render.setClosedIcon(new ImageIcon("close.gif"));
render.setOpenIcon(new ImageIcon("open.gif"));
render.setTextSelectionColor(Color.red);
render.setTextNonSelectionColor(Color.green);
render.setFont(new Font("TimeRoman",Font.BOLD,16));
tree.setCellRenderer(render);
JScrollPane scrollpane=new JScrollPane(tree);
con.add(scrollpane);
}
}
import Javax.swing.*;
import Javax.swing.tree.*;
import Java.awt.*;
import Java.awt.event.*;
import Java.io.*;import Java.util.*;
class Classmate extends JFrame
{ JTree tree=null; DefaultMutableTreeNode root;
BufferedReader in; FileReader file;
Classmate()
{ Container con=getContentPane();
String s=null;
try { File f=new File("通讯录.txt");
file=new FileReader(f);
in=new BufferedReader(file);
}
catch(FileNotFoundException e){}
try { s=in.readLine(); //读取第一行并用它创建根节点。
root=new DefaultMutableTreeNode(s);
}
catch(IOException exp){}
try
{ while((s=in.readLine())!=null&&(s.startsWith("%")))
{ s=in.readLine();
DefaultMutableTreeNode 同学种类=new DefaultMutableTreeNode(s);
root.add(同学种类);
while((s=in.readLine())!=null&&!(s.startsWith("end")))
{ StringTokenizer tokenizer=new StringTokenizer(s,"#");
String temp=tokenizer.nextToken();
DefaultMutableTreeNode 同学种类_姓名
=new DefaultMutableTreeNode(temp);
同学种类.add(同学种类_姓名);
while(tokenizer.hasMoreTokens())
{
同学种类_姓名.add(new DefaultMutableTreeNode(tokenizer.nextToken()));
}
}
}
}
catch(IOException exp){}
tree =new JTree(root);
JScrollPane scrollpane=new JScrollPane(tree);
con.add(scrollpane);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);} });
setVisible(true);setBounds(70,80,200,300);
}
}
public class Example31
{ public static void main(String args[])
{ Classmate win=new Classmate();win.pack();}
}
import Javax.swing.*;
import Javax.swing.tree.*;
import Java.awt.*;
import Java.awt.event.*;
import Javax.swing.event.*;
import Java.io.*;
class Remember extends JFrame implements TreeSelectionListener,ActionListener
{ JTree tree=null;JTextArea text=new JTextArea(" ",20,20);int i=0;
DefaultMutableTreeNode root;JButton b_save=new JButton("保存日志"),
b_del=new JButton("删除日志");
DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];
Remember()
{ Container con=getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("日历记事本");
for(i=1;i<=12;i++)
{ month[i]=new DefaultMutableTreeNode(""+i+"月");
root.add(month[i]);
}
for(i=1;i<=12;i++)
{ if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
{ for(int j=1;j<=31;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
else if(i==4||i==6||i==9||i==11)
{ for(int j=1;j<=30;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
else
{ for(int j=1;j<=28;j++)
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
}
b_save.addActionListener(this); b_del.addActionListener(this);
tree =new JTree(root);
JPanel p=new JPanel();p.setLayout(new BorderLayout());
JScrollPane scrollpane_1=new JScrollPane(text);
p.add(scrollpane_1,BorderLayout.CENTER);
JPanel p_1=new JPanel();p_1.add(b_save);p_1.add(b_del);
p.add(p_1,BorderLayout.NORTH);
JScrollPane scrollpane_2=new JScrollPane(tree);
JSplitPane splitpane=
new SplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scrollpane_2,p);
tree.addTreeSelectionListener(this);
con.add(splitpane);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{System.exit(0);
}
});
setVisible(true);setBounds(70,80,200,300);
}
public void valueChanged(TreeSelectionEvent e)
{ text.setText(" ");
if(e.getSource()==tree)
{ DefaultMutableTreeNode node=
(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{ String str=node.toString();
for(int i=0;i<=12;i++)
{ if(node.getParent()==month[i])
{ try
{ String temp=null;
File f=new File(node.getParent().toString()+str+".txt");
FileReader file=new FileReader(f);
BufferedReader in=new BufferedReader(file);
while((temp=in.readLine())!=null)
text.append(temp+'/n');
file.close();in.close();
}
catch(FileNotFoundException e1){}
catch(IOException e1){}
}
}
}
}
}
public void actionPerformed(ActionEvent e)
{ if(e.getSource()==b_save)
{ DefaultMutableTreeNode node=
(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{ try
{ File f=new File(node.getParent().toString()+str+".txt");
FileWriter tofile=new FileWriter(f);
BufferedWriter out=new BufferedWriter(tofile);
out.write(text.getText(),0,(text.getText()).length());
out.flush();
tofile.close();out.close();
}
catch(FileNotFoundException e1){}
catch(IOException e1){}
}
}
else if(e.getSource()==b_del)
{ DefaultMutableTreeNode node=
(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{
File f=new File(node.getParent().toString()+str+".txt");
f.delete();
}
}
}
}
public class Example25_32
{ public static void main(String args[])
{ Remember win=new Remember();win.pack();
}
}
import Java.util.*;
public class LinkListOne
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
mylist.add("It"); //链表中的第一个节点。
mylist.add("is"); //链表中的第二个节点。
mylist.add("a"); //链表中的第三个节点。
mylist.add("door"); //链表中的第四个节点。
int number=mylist.size(); //获取链表的长度。
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"节点中的数据:"+temp);
}
}
}
import Java.util.*;
public class LinkListTwo
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
mylist.add("is"); mylist.add("a");
int number=mylist.size();
System.out.println("现在链表中有"+number+"个节点:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"节点中的数据:"+temp);
}
mylist.addFirst("It");mylist.addLast("door");
number=mylist.size();
System.out.println("现在链表中有"+number+"个节点:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"节点中的数据:"+temp);
}
mylist.remove(0);mylist.remove(1);
mylist.set(0,"open");
number=mylist.size();
System.out.println("现在链表中有"+number+"个节点:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"节点中的数据:"+temp);
}
}
}
import Java.util.*;
class Student
{String name ;int number;float score;
Student(String name,int number,float score)
{this.name=name;this.number=number;this.score=score;
}
}
public class LinkListThree
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
Student stu_1=new Student("赵好民" ,9012,80.0f),
stu_2=new Student("钱小青" ,9013,90.0f),
stu_3=new Student("孙力枚" ,9014,78.0f),
stu_4=new Student("周左右" ,9015,55.0f);
mylist.add(stu_1); mylist.add(stu_2);
mylist.add(stu_3); mylist.add(stu_4);
Iterator iter=mylist.iterator();
while(iter.hasNext())
{ Student te=(Student)iter.next();
System.out.println(te.name+" "+te.number+" "+te.score);
}
}
}
import Java.util.*;import Java.awt.event.*;import Java.awt.*;
import Javax.swing.*;import Java.io.*;
class 商品 extends Panel
{String 代号,名称;int 库存;float 单价;
商品(String 代号,String 名称,int 库存,float 单价)
{this.代号=代号;this.名称=名称;this.库存=库存;this.单价=单价;
}
}
class ShowWin extends JFrame implements ActionListener
{ LinkedList goods_list=null;
JTextField 代号文本框=new JTextField(),
名称文本框=new JTextField(),
库存文本框=new JTextField(),
单价文本框=new JTextField(),
删除文本框=new JTextField();
JButton b_add=new JButton("添加商品"),
b_del=new JButton("删除商品"),
b_show =new JButton("显示商品清单");
JTextArea 显示区=new JTextArea();
ShowWin()
{goods_list=new LinkedList();
Container con=getContentPane();
JScrollPane pane=new JScrollPane(显示区);
显示区.setEditable(false);
JPanel save=new JPanel();save.setLayout(new GridLayout(5,2));
save.add(new Label("输入代号:"));save.add(代号文本框);
save.add(new Label("输入名称:"));save.add(名称文本框);
save.add(new Label("输入库存:"));save.add(库存文本框);
save.add(new Label("输入单价:"));save.add(单价文本框);
save.add(new Label("点击添加:"));save.add(b_add);
JPanel del=new JPanel();del.setLayout(new GridLayout(2,2));
del.add(new Label("输入删除的代号:"));del.add(删除文本框);
del.add(new Label("点击删除:"));del.add(b_del);
JPanel show=new JPanel();show.setLayout(new BorderLayout());
show.add(pane,BorderLayout.CENTER);show.add(b_show,BorderLayout.SOUTH);
JSplitPane split_one,split_two;
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,save,del);
split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,show);
con.add(split_two,BorderLayout.CENTER);
b_add.addActionListener(this);b_del.addActionListener(this);
b_show.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==b_add)
{String daihao=null,mingcheng=null;int kucun=0;float danjia=0.0f;
daihao=代号文本框.getText();mingcheng=名称文本框.getText();
kucun=Integer.parseInt(库存文本框.getText());
danjia=Float.valueOf(单价文本框.getText()).floatValue();
商品 goods=new 商品(daihao,mingcheng,kucun,danjia);
goods_list.add(goods);
try {FileOutputStream file=new FileOutputStream("goods.txt");
ObjectOutputStream out=new ObjectOutputStream(file);
out.writeObject(goods_list);out.close();
}
catch(IOException event){}
}
else if(e.getSource()==b_del)
{String daihao=删除文本框.getText();
try {FileInputStream come_in=new FileInputStream("goods.txt");
ObjectInputStream in=new ObjectInputStream(come_in);
goods_list=(LinkedList)in.readObject();in.close();
}
catch(ClassNotFoundException event){}
catch(IOException event){}
for(int i=0;i<goods_list.size();i++)
{商品 temp=(商品)goods_list.get(i);
if(temp.代号.equals(daihao)) {goods_list.remove(i);}
try {FileOutputStream file=new FileOutputStream("goods.txt");
ObjectOutputStream out=new ObjectOutputStream(file);
out.writeObject(goods_list);
out.close();
}
catch(IOException event){}
}
}
else if(e.getSource()==b_show)
{ 显示区.setText(null);
try {FileInputStream come_in=new FileInputStream("goods.txt");
ObjectInputStream in=new ObjectInputStream(come_in);
goods_list=(LinkedList)in.readObject();
}
catch(ClassNotFoundException event){}
catch(IOException event){}
Iterator iter=goods_list.iterator();
while(iter.hasNext())
{ 商品 te=(商品)iter.next();
显示区.append("商品代号:"+te.代号+" ");
显示区.append("商品名称:"+te.名称+" ");
显示区.append("商品库存:"+te.库存+" ");
显示区.append("商品单价:"+te.单价+" ");
显示区.append("/n");
}
}
}
}
public class LinkListFour
{public static void main(String args[])
{ ShowWin win=new ShowWin();
win.setSize(100,100);
win.setVisible(true);
win.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
import Java.util.*;
class StackOne
{public static void main(String args[])
{Stack mystack=new Stack();
mystack.push(new Integer(1)); mystack.push(new Integer(2));
mystack.push(new Integer(3)); mystack.push(new Integer(4));
mystack.push(new Integer(5)); mystack.push(new Integer(6));
while(!(mystack.empty()))
{Integer temp=(Integer)mystack.pop();
System.out.print(" "+temp.toString());}
}
}
import Java.util.*;
class StackTwo
{public static void main(String args[])
{Stack mystack=new Stack();
mystack.push(new Integer(1)); mystack.push(new Integer(1));
int k=1;
while(k<=10)
for(int i=1;i<=2;i++)
{Integer F1=(Integer)mystack.pop();int f1=F1.intValue();
Integer F2=(Integer)mystack.pop();int f2=F2.intValue();
Integer temp=new Integer(f1+f2);
System.out.println(""+temp.toString());
mystack.push(temp);mystack.push(F2);k++;
}
}
}
import Java.util.*;
class TreeOne
{public static void main(String args[])
{ TreeSet mytree=new TreeSet();
mytree.add("boy");mytree.add("zoo");
mytree.add("apple"); mytree.add("girl");
Iterator te=mytree.iterator();
while(te.hasNext())
System.out.println(""+te.next());
}
}
import Java.util.*;import Java.awt.*;
class TreeTwo
{public static void main(String args[])
{ TreeSet mytree=new TreeSet(new Comparator()
{public int compare(Object a,Object b)
{Student stu1=(Student)a;Student stu2=(Student)b;
return stu1.compareTo(stu2);}
});
Student st1,st2,st3,st4;
st1=new Student(90,"zhan ying");st2=new Student(66,"wang heng");
st3=new Student(86,"Liuh qing");st4=new Student(76,"yage ming");
mytree.add(st1);mytree.add(st2);mytree.add(st3);mytree.add(st4);
Iterator te=mytree.iterator();
while(te.hasNext())
{Student stu=(Student)te.next();
System.out.println(""+stu.name+" "+stu.english);
}
}
}
class Student implements Comparable
{ int english=0;String name;
Student(int e,String n)
{english=e;name=n;
}
public int compareTo(Object b)
{ Student st=(Student)b;
return (this.english-st.english);
}
}
import Java.util.*;import Java.awt.event.*;
import Java.awt.*;
class 节目 implements Comparable
{String name;double time;
节目(String 名称,double 演出时间)
{name=名称;time=演出时间;
}
public int compareTo(Object b)
{节目 item=(节目)b;
return (int)((this.time-item.time)*1000);
}
}
class Win extends Frame implements ActionListener
{ TreeSet 节目清单=null;
TextField 名称文本框=new TextField(10),
时间文本框=new TextField(5),
删除文本框=new TextField(5);
Button b_add=new Button("添加节目"),
b_del=new Button("删除节目"),
b_show =new Button("显示节目清单");
TextArea 显示区=new TextArea();
Win()
{ 节目清单=new TreeSet(new Comparator()
{public int compare(Object a,Object b)
{节目 item_1=(节目)a;
节目 item_2=(节目)b;
return item_1.compareTo(item_2);
}
});
Panel 节目单输入区=new Panel();
节目单输入区.add(new Label("节目名称:"));
节目单输入区.add(名称文本框);
节目单输入区.add(new Label("演出时间:"));
节目单输入区.add(时间文本框);
节目单输入区.add(new Label("点击添加:"));
节目单输入区.add(b_add);
节目单输入区.add(b_show);
Panel 节目单删除区=new Panel();
节目单删除区.add(new Label("输入演出的时间:"));
节目单删除区.add(删除文本框);
节目单删除区.add(new Label("点击删除:"));
节目单删除区.add(b_del);
Panel 节目单显示区=new Panel();
节目单显示区.add(显示区);
显示区.setBackground(Color.pink);
b_add.addActionListener(this);b_del.addActionListener(this);
b_show.addActionListener(this);
add(节目单输入区,"North");add(节目单显示区,"Center");
add(节目单删除区,"South");
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==b_add)
{String 名称=null;double 时间=0.0;
名称=名称文本框.getText();
try{时间=Double.valueOf(时间文本框.getText()).doubleValue();
}
catch(NumberFormatException ee)
{时间文本框.setText("请输入代表时间的实数");
}
节目 programme=new 节目(名称,时间);
节目清单.add(programme);
showing();
}
else if(e.getSource()==b_del)
{节目 待删除节目=null;
double time=Double.valueOf(删除文本框.getText()).doubleValue();
Iterator te=节目清单.iterator();
while(te.hasNext())
{节目 item=(节目)te.next();
if(Math.abs(item.time-time)<=0.000001d)
{待删除节目=item; }
}
if(待删除节目!=null) 节目清单.remove(待删除节目);
showing();
}
else if(e.getSource()==b_show)
{ showing();
}
}
void showing()
{ 显示区.setText(null);
Iterator iter=节目清单.iterator();
while(iter.hasNext())
{节目 item=(节目)iter.next();
显示区.append("节目名称:"+item.name+"演出时间: "+item.time);
显示区.append("/n");
}
}
}
public class Tree_3
{public static void main(String args[])
{ Win win=new Win();
win.setSize(500,250);win.setVisible(true);
win.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
import Java.util.*;
class Student
{ int english=0; String name,number;
Student(String na,String nu,int e)
{english=e;name=na;number =nu;}
}
public class HT
{ public static void main(String args[])
{ Hashtable hashtable=new Hashtable();
hashtable.put("199901",new Student("199901","王小林",98));
hashtable.put("199902",new Student("199902","能林茂",70));
hashtable.put("199903",new Student("199903","多种林",93));
hashtable.put("199904",new Student("199904","围林蛤",46));
hashtable.put("199905",new Student("199905","夹贸林",77));
hashtable.put("199906",new Student("199906","噔林可",55));
hashtable.put("199907",new Student("199907","降王林",68));
hashtable.put("199908",new Student("199908","纠林咯",76));
Student stu=(Student)hashtable.get("199902");//检索一个元素。
System.out.println(stu.number+" "+stu.name+" "+stu.english);
hashtable.remove("199906"); //删除一个元素
System.out.println("散列表中现在含有："+hashtable.size()+"个元素");
Enumeration enum=hashtable.elements();
while(enum.hasMoreElements()) //遍历当前散列表。
{Student s=(Student)enum.nextElement();
System.out.println(s.number+" "+s.name+" "+s.english);
}
}
}
import Java.util.*;import Java.awt.event.*;import Java.awt.*;
import Javax.swing.*;import Java.io.*;
class 学生 extends JPanel
{String 学号,姓名;float 分数;
学生(String 学号,String 姓名,float 分数)
{this.学号=学号;this.姓名=姓名;this.分数=分数;
}
}
class ShowWin extends JFrame implements ActionListener
{ Hashtable hashtable=new Hashtable();
JTextField 学号文本框=new JTextField(),
姓名文本框=new JTextField(),
分数文本框=new JTextField(),
查询文本框=new JTextField();
JButton b_add=new JButton("添加成绩"),
b_show =new JButton("显示成绩");
JTextField 成绩显示条=new JTextField();
ShowWin()
{Container con=getContentPane();
JPanel 成绩输入区=new JPanel();
成绩输入区.setLayout(new GridLayout(5,2));
成绩输入区.add(new Label("成绩输入区:"));
成绩输入区.add(new Label());
成绩输入区.add(new Label("考生学号:"));
成绩输入区.add(学号文本框);
成绩输入区.add(new JLabel("考生姓名:"));
成绩输入区.add(姓名文本框);
成绩输入区.add(new Label("考生成绩:"));
成绩输入区.add(分数文本框);
成绩输入区.add(new Label("点击添加:"));
成绩输入区.add(b_add);
JPanel 查询显示区=new JPanel();
查询显示区.setLayout(new GridLayout(3,2));
查询显示区.add(new Label("成绩查询区:"));
查询显示区.add(new Label());
查询显示区.add(new Label("输入考生的学号："));
查询显示区.add(查询文本框);
查询显示区.add(b_show);
查询显示区.add(成绩显示条);
JSplitPane split;
split=new JSplitPane(JSplitPane.VERTICAL_SPLIT,成绩输入区,查询显示区);
con.add(split,BorderLayout.CENTER);
con.add(new Label("成绩输入和查询系统"),BorderLayout.NORTH);
b_add.addActionListener(this);b_show.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==b_add)
{String 学号=null,姓名=null;float 分数=0.0f;
try {学号=学号文本框.getText();
姓名=姓名文本框.getText();
}
catch(NullPointerException ee)
{ 学号文本框.setText("请输入学号");
姓名文本框.setText("请输入姓名");
}
try{分数=Float.valueOf(分数文本框.getText()).floatValue();}
catch(NumberFormatException ee)
{分数文本框.setText("请输入数字字符");}
学生 stu=new 学生(学号,姓名,分数);
hashtable.put(学号,stu);
try {FileOutputStream file=new FileOutputStream("score.txt");
ObjectOutputStream out=new ObjectOutputStream(file);
out.writeObject(hashtable); out.close();
}
catch(IOException event){}
}
else if(e.getSource()==b_show)
{ String temp=null;
temp=查询文本框.getText();
成绩显示条.setText(null);
try {FileInputStream come_in=new FileInputStream("score.txt");
ObjectInputStream in=new ObjectInputStream(come_in);
hashtable=(Hashtable)in.readObject();in.close();
}
catch(ClassNotFoundException event){}
catch(IOException event){System.out.println("文件无法读出");}
学生 s=(学生)hashtable.get(temp);
成绩显示条.setText("姓名:"+s.姓名+"学号:"+s.学号+"成绩:"+s.分数);
}
}
}
public class HT_2
{public static void main(String args[])
{ ShowWin win=new ShowWin();
win.setSize(100,100); win.setVisible(true);
win.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
import Java.util.*;
class Example26_12
{public static void main(String args[])
{ Vector vector=new Vector(); Date date=new Date();
vector.add(new Integer(1));vector.add(new Float(3.45f));
vector.add(new Double(7.75));vector.add(new Boolean(true));
vector.add(date);
System.out.println(vector.size());
Integer number1=(Integer)vector.get(0);
System.out.println("向量的第1个元素： "+number1.intValue());
Float number2=(Float)vector.get(1);
System.out.println("向量的第2个元素： "+number2.floatValue());
Double number3=(Double)vector.get(2);
System.out.println("向量的第3个元素： "+number3.doubleValue());
Boolean number4=(Boolean)vector.get(3);
System.out.println("向量的第4个元素： "+number4.booleanValue());
date=(Date)vector.lastElement();
System.out.println("向量的第5个元素： "+date.toString());
if(vector.contains(date))
System.out.println("ok");
}
}
import Java.applet.*;
import Java.awt.*;import Java.util.*;
import Java.awt.event.*;
class Point
{int x,y;
Point(int x,int y)
{this.x=x;this.y=y;
}
}
public class Example26_13 extends Applet
implements MouseMotionListener,MouseListener
{ int x=-1,y=-1;
Vector v=null;int n=1;
public void init()
{ setBackground(Color.green);
addMouseMotionListener(this); addMouseListener(this);
v=new Vector();
}
public void paint(Graphics g)
{if(x!=-1&&y!=-1)
{ n=v.size();
for(int i=0;i<n-1;i++)
{Point p1=(Point)v.elementAt(i);
Point p2=(Point)v.elementAt(i+1);
g.drawLine(p1.x,p1.y,p2.x,p2.y);
}
}
}
public void mouseDragged(MouseEvent e)
{ x=(int)e.getX();y=(int)e.getY();
Point p=new Point(x,y);
v.addElement(p);
repaint();
}
public void mouseMoved(MouseEvent e)
{}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e)
{v.removeAllElements();}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
public void update(Graphics g)
{ paint(g);
}
}