circle99.java

开始学JAVA的几个程序

import java.awt.*;
import java.applet.*;
public class Circle99 extends Applet
{
  public void paint(Graphics g)
  {
    g.drawString("Circle 99",20,20);
    int x0=getSize().width/2;
    int y0=getSize().height/2;
    for(int r=0;r<getSize().height/2;r+=3)
    {
      g.setColor(getRandomColor());
      g.drawOval(x0-r,y0-r,r*2,r*2);
    }
  }
  Color getRandomColor()
  {
    return new Color((int)(Math.random()*255),
                     (int)(Math.random()*255),
                     (int)(Math.random()*255));
  }
}