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);
  }
}