example19_2.java

里面5个JAVA小程序

import java.awt.*;import java.awt.event.*;
public class Example19_2
{  public static void main(String args[])
   {  Mywin win=new Mywin();win.pack();
   }
}
class Mywin extends Frame implements Runnable
{  Button b=new Button("ok");int x=5;
   Thread bird=null;
   Mywin()
   {  setBounds(100,100,120,120);setLayout(new FlowLayout());
      setVisible(true);
      add(b);b.setBackground(Color.green);
      addWindowListener(new WindowAdapter()
           {  public void windowClosing(WindowEvent e)
              {  System.exit(0);
              }
           });
      bird=new Thread(this);//创建一个新的线程，窗口做目标对象，
                          //替线程bird实现接口Runnable。
      bird.start();         //在创建窗口时又开始了线程bird。
   }
   public void run()       //实现bird的操作。
   {  while(true)
       {  x=x+1;
          if(x>100) x=5;
          b.setBounds(40,40,x,x);
          try{  bird.sleep(200);
             }
          catch(InterruptedException e){} 
       }
   }
}