import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;


public class One extends Applet implements MouseListener,
                                           MouseMotionListener {

  Image[] frames = new Image[10];

  int currentFrame = 0;

  int locX = 60, locY = 60;

  public void init() {

    Component component = this;
    MediaTracker tracker = new MediaTracker(component);

    for (int i = 0; i < 10; i++) {
      String imgName = "images/T" + (i + 1) + ".gif";
      frames[i] = this.getImage(this.getCodeBase(), imgName);
      tracker.addImage(frames[i], 0);
    }

    System.out.println("Images are being loaded...");

    try {
      tracker.waitForAll();
    } catch (Exception e) { 
      System.out.println("Something went wrong..."); 
    }

    if (tracker.isErrorAny()) {

       System.out.println("*** isErrorAny() reports an error... ");

    }  else if (tracker.checkAll()) {

       System.out.println("All's well.");

    }

    MouseListener mouseListener = this;
    this.addMouseListener(mouseListener);

    MouseMotionListener mouseMotionListener = this;
    this.addMouseMotionListener(mouseMotionListener);

  }

  public void paint(Graphics g) {

    ImageObserver imgObserver = this;

    g.drawImage(frames[currentFrame], locX, locY, imgObserver);

    // g.drawString("(" + locX + ", " + locY + ")", locX, locY);

  }

  public void mouseMoved(MouseEvent e) {

     currentFrame = (currentFrame + 1) % 10;

     locX = e.getX();
     locY = e.getY();
     repaint();
  }
  public void mouseDragged(MouseEvent e) { }
  public void mouseEntered(MouseEvent e) { }
  public void mouseExited(MouseEvent e) { }
  public void mousePressed(MouseEvent e) { }
  public void mouseReleased(MouseEvent e) { }
  public void mouseClicked(MouseEvent e) { }


} 

The code above does give you animation, of a very primitive type.