图形用户界面

GUI组件

1. 框架
2. 容器
3. 按钮
4. 标签
5. 文本框和密码框及文本区域
6. 下拉式列表
7. 复选框和单选按钮

           案例1：框架、容器、按钮

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

//继承顶级框架JFrame
public class SimpleFrame extends JFrame {

	//初始化面板组件
    JPanel panel=new JPanel();
    //初始化图标
    ImageIcon addIcon=new ImageIcon("src/add.gif");
    ImageIcon deleteIcon=new ImageIcon("src/delete.gif");
    //初始化按钮
    JButton button=new JButton("button");
    JButton addButton=new JButton("add",addIcon);
    JButton deleteButton=new JButton("delete", deleteIcon);
	public SimpleFrame(){
		//带参数的JFrame构造方法
		super("Frame title");
		//把组件添加到面板容器panel中
		panel.add(button);
		panel.add(addButton);
		panel.add(deleteButton);
		//把面板容器panel添加到框架中
		this.add(panel);
		//设置框架大小
		setSize(300,300);
		//关闭框架
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//依据组件大小自动调整框架大小
		this.pack();
		//设置框架显示
		setVisible(true);
	}
	public static void main(String[] args) {
		new SimpleFrame();
	}
}

          案例2：标签、文本框、文本区域

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextArea;
import javax.swing.JTextField;


public class LabelText extends JFrame {
   
	JPanel panel=new JPanel();
	//初始化标签
	JLabel labelName=new JLabel("用户名:");
	JLabel labelPassword=new JLabel("密    码:");
	JLabel labelDescription=new JLabel("个人说明:");
	//初始化文本框
	JTextField textName=new JTextField(10);
	//初始化密码框
	JPasswordField psk=new JPasswordField(10);
	//初始化文本区域
	JTextArea areaDesc=new JTextArea(4, 15);
	public LabelText(){
		//添加组件到面板容器panel中
		panel.add(labelName);
		panel.add(textName);
		panel.add(labelPassword);
		panel.add(psk);
		panel.add(labelDescription);
		panel.add(areaDesc);
		this.setSize(200,200);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.add(panel);
		this.setVisible(true);
	}
	public static void main(String[] args) {
		new LabelText();
	}
}

 
案例3：滚动条、文本区域

import java.awt.Panel;
import java.awt.TextArea;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;


public class JScrollPaneDemo extends JFrame{

	JScrollPane jsp=null;
	JPanel panel=null;
	JTextArea textArea=null;
	public JScrollPaneDemo(){
		//初始化文本区域
		textArea=new JTextArea(4, 10);
		//设置文本区域自动换行
		textArea.setLineWrap(true);
		//为文本区域设置滚动条
		jsp=new JScrollPane(textArea);
		//初始化面板及添加组件
		panel=new JPanel();
		panel.add(jsp);
		this.add(panel);
		this.setSize(200, 300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}
	public static void main(String[] args) {
		new JScrollPaneDemo();
	}
}

 
案例4：复选框和单选框

import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;


public class CheckRadioDemo extends JFrame{

	
	JRadioButton[] teams=new JRadioButton[3];
	ButtonGroup group=null;
	
	JPanel panel=null;
	public CheckRadioDemo(){
		panel=new JPanel();
		ImageIcon icon=new ImageIcon("add.gif");
		JCheckBox checkBox1=new JCheckBox("增加");
		JCheckBox checkBox2=new JCheckBox("删除");
		ImageIcon icon1=new ImageIcon("view.gif");
		JCheckBox checkBox3=new JCheckBox("查看");
		
		panel.add(checkBox1);
		panel.add(checkBox2);
		panel.add(checkBox3);
		teams[0]=new JRadioButton("猪");
		teams[1]=new JRadioButton("马");
		teams[2]=new JRadioButton("牛");
		
		group=new ButtonGroup();
		
		for(JRadioButton jrb:teams){
			group.add(jrb);
			panel.add(jrb);
		}
		this.add(panel);
		this.setSize(300, 300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}
	public static void main(String[] args) {
		new CheckRadioDemo();
	}
}

 
案例5：下拉式列表
 

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

/**
 * 组合框JcomboBox和列表JList的用法
 * @author Administrator
 *
 */
public class ComDemo  extends JFrame{

	//组合框，下拉式菜单
	Object[] items={"北京","上海","广州","深圳","重庆","成都"};
	JComboBox jcb=new JComboBox(items);
	JPanel panel=new JPanel();
	
	//列表
	Object[] listData={"beijing","shanghai","guangzhou","shenzhen","chongqin","chengdu","hefei","zhenzhou","liaocheng","jinan","xizhang","lasa"};
	JList list=new JList(listData);
	
	public ComDemo()
	{
	    list.setVisibleRowCount(4);	
	    JScrollPane jsp=new JScrollPane(list);
		panel.add(jcb);
		panel.add(jsp);
		this.setSize(300,300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
		this.add(panel);
	}
	public static void main(String[] args) {
		new ComDemo();
	}
}