/**Copyright (C) Guan Chengwen at Xiamen University
**2005-12-25
**Student ID: 03231004, Philosophy Department
**Email: mydream2007@hotmail.com QQ: 233204600
**Homepage: http://blog.csdn.net/aprin/
**
**File: Main.java
**Package: aprin.stu_sys
*/
package aprin.stu_sys;
import java.lang.*;
import java.io.*;
import aprin.stu_sys.*;
public class Main
{
public static void main(String[] args)
{
while(true)
{
Menu.paint();
int ctrlTag = Console.readInt();
switch(ctrlTag)
{
case 1:
{
Menu.action1();
break;
}
case 2:
{
Menu.action2();
break;
}
case 3:
{
Menu.action3();
break;
}
case 4:
{
Menu.action4();
break;
}
case 5:
{
Menu.action5();
break;
}
case 6:
{
Menu.action6();
break;
}
case 0:
{
System.exit(0);
break;
}
}
}
}
}
class Student
{
private int number;
private String name;
private int english;
private int math;
private int computer;
private int average;
private int total;
public Student()
{
}
public Student(int number, String name, int english, int math, int computer)
{
this.number = number;
this.name = name;
this.english = english;
this.math = math;
this.computer = computer;
total = english + math + computer;
average = total/3;
}
public int getNumber()
{
return number;
}
public String getName()
{
return name;
}
public int getEnglish()
{
return english;
}
public int getMath()
{
return math;
}
public int getComputer()
{
return computer;
}
public int getAverage()
{
return average;
}
public int getTotal()
{
return total;
}
}
class StudentSet
{
private static final int maxLen = 1000;
private static int len = 0;
private static Student[] data = new Student[maxLen];
public static int getMaxLen()
{
return maxLen;
}
public static int getLen()
{
return len;
}
public static Student getData(int index)
{
return data[index];
}
public static int addData(Student newData)
{
if (len < maxLen)
{
data[len] = newData;
len++;
return 0;
} else
{
return -1;
}
}
public static void sortData()
{
for (int i = 0; i < len -1; i++)
{
int minIndex = i;
for (int j = i+1; j < len; j++)
{
if (data[minIndex].getAverage() > data[j].getAverage())
{
minIndex = j;
}
}
if (minIndex != i)
{
Student temp = data[i];
data[i] = data[minIndex];
data[minIndex] = temp;
}
}
}
public static int search(int number)
{
for(int i = 0; i < len; i++)
{
if (data[i].getNumber() == number)
{
return i;
}
}
return -1;
}
public static int delete(int number)
{
for (int i = 0; i < len; i++)
{
if (data[i].getNumber() == number)
{
for (int j = i + 1; j < len; j++)
{
data[j-1] = data[j];
}
len--;
return 0;
}
}
return -1;
}
public static int stat(int min, int max)
{
int sum =0;
for (int i = 0; i < len; i++)
{
if ((data[i].getAverage() >= min) && (data[i].getAverage() <= max))
{
sum++;
}
}
return sum;
}
}
class Console
{
public static int readInt()
{
int result = 0;
try{
String temp =new BufferedReader(new InputStreamReader(System.in)).readLine();
result = Integer.parseInt(temp);
} catch (Exception e)
{
System.out.println("Error: "+e);
}
return result;
}
public static String readSting()
{
String result = null;
try{
result = new BufferedReader(new InputStreamReader(System.in)).readLine();
} catch (Exception e)
{
System.out.println("Error: "+e);
}
return result;
}
}
class Menu
{
public static void paint()
{
clrscr();
for (int i = 0; i < 80; i++)
{
System.out.print('=');
}
System.out.println();
System.out.println(" 学生成绩管理系统 ");
System.out.println();
System.out.println(" 1 输入记录 2 输出所有记录");
System.out.println(" 3 按平均成绩排序并输出 4 查找记录");
System.out.println(" 5 统计各分数段人数 6 删除记录");
System.out.println(" 0 退出");
for (int i = 0; i < 80; i++)
{
System.out.print('=');
}
System.out.println(" Copyright (C) 2005 官成文 厦门大学");
System.out.println();
System.out.print("请输入命令：");
}
public static int action1()
{
while(true)
{
clrscr();
System.out.print("待输入记录的学号（输入“-1”退出）：");
int number = Console.readInt();
if (number != -1)
{
System.out.print(" *姓名：");
String name = Console.readSting();
System.out.print(" *英语：");
int english = Console.readInt();
System.out.print(" *数学：");
int math = Console.readInt();
System.out.print(" *计算机：");
int computer = Console.readInt();
Student newData = new Student(number, name, english, math, computer);
if (StudentSet.addData(newData) == -1)
{
System.out.println("数据溢出！");
return -2;
}
} else
{
return -1;
}
}
}
public static void action2()
{
clrscr();
if (StudentSet.getLen() == 0)
{
System.out.println("没有记录！");
} else
{
System.out.println(" 数学|英语|计算机|平均|总计");
for (int i = 0; i < StudentSet.getLen(); i++)
{
System.out.println("学号："+StudentSet.getData(i).getNumber()+" 姓名："+StudentSet.getData(i).getName());
System.out.println(" "+StudentSet.getData(i).getMath()+" "+StudentSet.getData(i).getEnglish()+
" "+StudentSet.getData(i).getComputer()+" "+StudentSet.getData(i).getAverage()+" "+StudentSet.getData(i).getTotal());
}
}
}
public static void action3()
{
StudentSet.sortData();
action2();
}
public static void action4()
{
clrscr();
System.out.print("请输入要查找记录的学号：");
int number = Console.readInt();
int i;
if ((i = StudentSet.search(number)) != -1)
{
clrscr();
System.out.println(" 数学|英语|计算机|平均|总计");
System.out.println("学号："+StudentSet.getData(i).getNumber()+" 姓名："+StudentSet.getData(i).getName());
System.out.println(" "+StudentSet.getData(i).getMath()+" "+StudentSet.getData(i).getEnglish()+
" "+StudentSet.getData(i).getComputer()+" "+StudentSet.getData(i).getAverage()+" "+StudentSet.getData(i).getTotal());
} else
{
System.out.println("没有找到相应的记录！");
}
}
public static void action5()
{
clrscr();
System.out.println("90-100: "+StudentSet.stat(90, 100)+"人");
System.out.println("80-89: "+StudentSet.stat(80, 89)+"人");
System.out.println("70-79: "+StudentSet.stat(70, 79)+"人");
System.out.println("60-69: "+StudentSet.stat(60, 69)+"人");
System.out.println("0-59: "+StudentSet.stat(0, 59)+"人");
}
public static void action6()
{
while(true)
{
clrscr();
System.out.print("请输入要删除记录的学号（输入“-1”退出）：");
int number = Console.readInt();
if (number != -1)
{
if(StudentSet.delete(number) == -1)
{
System.out.println("没有找到相应的记录！");
return;
} else
{
System.out.println("删除记录成功！");
}
} else
{
return;
}
}
}
public static void clrscr()
{ //temp function
System.out.println();
System.out.println();
}
}