testani.java

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import java.awt.*;
import java.applet.Applet;
public class testani extends Applet implements Runnable
{
  Thread runner;
  Image imgs[];
  int high, y1, y2, y3;
  public void init()
  {
    high = size().height;
    y1 = high;
    y2 = high*2;
    y3 = high*3;
    imgs = new Image[10];
    for(int i=0;i<3;i++)
    imgs[i]=getImage(getCodeBase(),getParameter("image"+(i+1)));
  }
  public void start()
  {
    runner = new Thread(this);
    runner.start();
  }
  public void stop()
  {
    runner.stop();
    runner = null;
  }
  public void run()
  {
    while (runner != null)
    {
      try
      {
        Thread.sleep(100);
        repaint();
        y1--;
        if(y1==0)
        {
          Thread.sleep(3000);
          y2=high;
        }
        y2--;
        if(y2==0)
        {
          Thread.sleep(3000);
          y3=high;
        }
        y3--;
        if(y3==0)
        {
          Thread.sleep(3000);
          y1 = high;
        }
      }
      catch (InterruptedException e){}
    }
  }
  public void paint(Graphics g)
  {
    g.drawImage(imgs[0], 0, y1, this);
    g.drawImage(imgs[1], 0, y2, this);
    g.drawImage(imgs[2], 0, y3, this);
  }
  public void update(Graphics g)
  {
    paint(g);
  }
}