事件：继承某个类和不继承某个类

import  java.awt. * ;
import  java.awt.event. * ;

public   class  WindowDemo  implements  WindowListener  ... {
    public WindowDemo()...{
        Frame f = new Frame("Window test");    //注意这一块
        f.setSize(300,300);
        f.setVisible(true);
        f.addWindowListener(this);
    }
    public static void main(String args[]) ...{
        new WindowDemo();
    }
     
     public void windowActivated(WindowEvent e) ...{
     }
     public  void windowClosed(WindowEvent e) ...{
     }
      public void windowClosing(WindowEvent e) ...{
          System.exit(0);
     }
     public  void windowDeactivated(WindowEvent e) ...{
     }
       public void windowDeiconified(WindowEvent e) ...{
      }
       public void windowIconified(WindowEvent e)  ...{
      }   
     public  void windowOpened(WindowEvent e) ...{
     }
}

 

import  java.awt. * ;
import  java.awt.event. * ;

public   class  WinListenerDemo  extends  Frame  implements  WindowListener ... {
    public WinListenerDemo() ...{
        super("Adapter demo");   //注意这一块
        this.setSize(300,300);
        this.setVisible(true);
        this.addWindowListener(this);
    }
    public static void main(String args[]) ...{
        new WinListenerDemo();
    }
    
    public void windowActivated(WindowEvent e) ...{
    }
    public void windowClosed(WindowEvent e)  ...{
    }
    public void windowClosing(WindowEvent e)  ...{
        this.dispose();
        System.exit(0);        
    }
    public void windowDeactivated(WindowEvent e) ...{
    }
    public void windowDeiconified(WindowEvent e) ...{
    }
    public void windowIconified(WindowEvent e)  ...{
    }
    public void windowOpened(WindowEvent e) ...{
    }
}