JAVA Frame 响应窗口关闭事件

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Window;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class FirstWindow extends Frame
{
    MenuBar menubar;
    Menu menu;
    MenuItem item1, item2;
    FirstWindow(String s)
    {
        setTitle(s);
        Toolkit tool = getToolkit();
        Dimension dim = tool.getScreenSize();
        setBounds(0, 0, 352, 288);
        menubar = new MenuBar();
        menu = new Menu("文件");
        item1 = new MenuItem("打开");
        item2 = new MenuItem("保存");
        menu.add(item1);
        menu.add(item2);
        menubar.add(menu);
        setMenuBar(menubar);
        setVisible(true); 

        this.addWindowListener(new WindowAdapter() {
          @Override
          public void windowClosing(WindowEvent e)
          {
             System.exit(0);
          }
      });

    }  

}
public class Window {
    public static void main(String args[])
    {
        FirstWindow win = new FirstWindow("一个带菜单的窗口");
    }  

}

看清楚,不是JFrame的派生类~~~

如果是JFrame  只需要加一句话: setDefaultCloseOperation