窗口监听：

 1 package com.gui.lesson3;
 2 
 3 import java.awt.*;
 4 import java.awt.event.WindowAdapter;
 5 import java.awt.event.WindowEvent;
 6 
 7 public class TestWindow {
 8     public static void main(String[] args) {
 9         new WindowFrame();
10     }
11 }
12 
13 class WindowFrame extends Frame {
14     public WindowFrame() {
15         setBackground(Color.green);
16         setBounds(100, 100, 200, 200);
17         setVisible(true);
18         addWindowListener(new MyWindowListener());
19     }
20 
21     //内部类
22     //WindowListener要重写方法太多了，所以我们继承它的实现类，WindowAdapter，选择要重写的方法即可
23     class MyWindowListener extends WindowAdapter {
24         @Override
25         public void windowClosing(WindowEvent e) {
26             setVisible(false);//隐藏窗口
27             //System.exit(0);//0是正常退出，1是关闭有异常的程序
28         }
29     }
30 }

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测试两个常用的事件：

 1 package com.gui.lesson3;
 2 
 3 import java.awt.*;
 4 import java.awt.event.WindowAdapter;
 5 import java.awt.event.WindowEvent;
 6 
 7 public class TestWindow {
 8     public static void main(String[] args) {
 9         new WindowFrame();
10     }
11 }
12 
13 class WindowFrame extends Frame {
14     public WindowFrame() {
15         setBackground(Color.green);
16         setBounds(100, 100, 200, 200);
17         setVisible(true);
18         addWindowListener(
19                 //推荐使用，匿名内部类
20                 new WindowAdapter() {
21                     //关闭窗口
22                     @Override
23                     public void windowClosing(WindowEvent e) {
24                         System.out.println("windowClosing");
25                         System.exit(0);
26                     }
27 
28                     //激活窗口：离开窗口后，会变成灰色，重新进入后，会显示正常的
29                     @Override
30                     public void windowActivated(WindowEvent e) {
31                         WindowFrame source = (WindowFrame) e.getSource();
32                         source.setTitle("人呢，快回来");
33                         System.out.println("windowActivated");
34                     }
35                 });
36     }
37 }

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