1 package java.util;
2
3 /**
4  * A tagging interface that all event listener interfaces must extend.
5  * @since JDK1.1
6  */
7 public interface EventListener {
8 }

 1 public interface WindowListener extends EventListener {
 2     /**
 3      * Invoked the first time a window is made visible.
 4      */
 5     public void windowOpened(WindowEvent e);
 6
 7     public void windowClosing(WindowEvent e);
 8
 9     public void windowClosed(WindowEvent e);
10
11     public void windowIconified(WindowEvent e);
12
13     public void windowDeiconified(WindowEvent e);
14
15     public void windowActivated(WindowEvent e);
16
17     public void windowDeactivated(WindowEvent e);
18 }

 1 public abstract class WindowAdapter
 2     implements WindowListener, WindowStateListener, WindowFocusListener
 3 {
 4     /**
 5      * Invoked when a window has been opened.
 6      */
 7     public void windowOpened(WindowEvent e) {}
 8
 9     public void windowClosing(WindowEvent e) {}
10
11     public void windowClosed(WindowEvent e) {}
12
13     public void windowIconified(WindowEvent e) {}
14
15     public void windowDeiconified(WindowEvent e) {}
16
17     public void windowActivated(WindowEvent e) {}
18
19     public void windowDeactivated(WindowEvent e) {}
20
21     public void windowStateChanged(WindowEvent e) {}
22
23     public void windowGainedFocus(WindowEvent e) {}
24
25     /**
26      * Invoked when the Window is no longer the focused Window, which means
27      * that keyboard events will no longer be delivered to the Window or any of
28      * its subcomponents.
29      *
30      * @since 1.4
31      */
32     public void windowLostFocus(WindowEvent e) {}
33 }

 1 import java.awt.Button;
 2 import java.awt.FlowLayout;
 3 import java.awt.Frame;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 import java.awt.event.WindowAdapter;
 7 import java.awt.event.WindowEvent;
 8
 9 public class FrameDemo {
10     public static void main(String[] args) {
11
12         Frame f = new Frame("my frame");
13         f.setBounds(400, 200, 500, 400);
14         f.setLayout(new FlowLayout());//设置流式布局
15
16         Button but  = new Button("一个按钮");
17         f.add(but);//将按钮添加到窗体中。
18
19         f.addWindowListener(new WindowAdapter() {
20             @Override
21             public void windowClosing(WindowEvent e) {
22                 //System.out.println("closing......."+e);
23                 System.exit(0);
24             }
25         });
26         //在按钮上加上一个监听。  点击按钮"一个按钮"就关闭
27         but.addActionListener(new ActionListener() {
28             @Override
29             public void actionPerformed(ActionEvent e) {
30                 //System.out.println("button run .....");
31                 System.exit(0);
32             }
33         });
34         f.setVisible(true);
35         System.out.println("over");
36     }
37 }