// TestWindowAdapter.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
//定义一个框架
public class TestWindowAdapter extends JFrame 
{
 // 构造方法
 public TestWindowAdapter(String title)
 {
 super(title);
 //注册窗口事件监听器
 addWindowListener(new MyListener()); 
 }
 //main方法
 public static void main(String[] args)
 {
 TestWindowAdapter frame = new TestWindowAdapter("TestWindowAdapter");
 frame.setSize(200, 100);
 frame.setVisible(true);
 }
 //通过继承WindowAdapter实现一个监听器类
 class MyListener extends WindowAdapter
 {
	 //当窗口正在关闭时被调用
	 public void windowClosing(WindowEvent event)
	 {
	 System.out.println("Window closing");
	 System.exit(0);
	 }
 } 
}