example7_26.java

不错的教程 适合中高级人员的使用

import java.awt.*;import java.awt.event.*;
class MyFrame extends Frame 
{  TextArea text;  Boy police;
   MyFrame(String s)
   {  super(s);
      police=new Boy(this);
      setBounds(100,100,200,300); setVisible(true);
      text=new TextArea(); add(text,BorderLayout.CENTER);
      addWindowListener(police); validate();
   } 
}
class Boy extends WindowAdapter 
{  MyFrame f;
   public Boy(MyFrame f)
   {  this.f=f;
   }
   public void windowActivated(WindowEvent e) 
     {  f.text.append("\n我被激活");
        }
   public void windowClosing(WindowEvent e)
   {  System.exit(0);
   }
}
class Example7_26
{  public static void main(String args[])
   {  new MyFrame("窗口");
   } 
}