JAVA Frame 響應窗口關閉事件

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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("打開");  
        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("一個帶菜單的窗口");
    }  
  
}

看清楚,不是JFrame的派生類~~~

如果是JFrame  只需要加一句話: setDefaultCloseOperation