example17_8.java.bak

来自「不错的教程 适合中高级人员的使用」· BAK 代码 · 共 21 行

import java.applet.*;import java.awt.*;
import java.awt.event.*;
public class Example17_8 extends Applet
{  int i=0;
   public void paint(Graphics g)
   {  i=(i+2)%360;
      Color c=new Color((3*i)%255,(7*i)%255,(11*i)%255);
      g.setColor(c); g.fillArc(30,50,120,100,i,2);
      g.fillArc(30,152,120,100,i,2);
      try{  //程序暂停300毫秒，再执行repaint()(见19章):
            Thread.sleep(300);
         }
      catch(InterruptedException e){}
     // repaint(); 
   }
   public void update(Graphics g)
   {  g.clearRect(30,152,120,100); 
      paint(g);
   }
}