java匿名类关闭窗口

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


public class Window1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Frame f1=new Frame();
        f1.setSize(100,100);
        Button b1=new Button();
        f1.add(b1);
        f1.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
        f1.setVisible(true);
    }
}