Tare Zammen Par effect in Java Applet

Code :

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication2;

import java.applet.Applet;
import java.awt.Dimension;
import java.awt.Graphics;
import java.lang.Math;


/*<applet code=NewApplet1' width='500' height='500'></applet>*/
/**
 *
 * @author zero
 */
public class NewApplet1 extends Applet implements Runnable {
    int a, b;
    Dimension d = getSize();
    /**
     * Initialization method that will be called after the applet is loaded into
     * the browser.
     */
    public void init() {
        Thread t = new Thread(this);
        t.start();
    }
   
    public void run() {
        while(true) {
           
                d = getSize();
                try {
                Thread.sleep(1);
                }
                catch(Exception e) {
                }
           
                a = (int)(d.width * Math.random());
                b = (int)(d.height * Math.random());
                showStatus(d.width + "," + d.height);
                repaint();
           
        }
    }
   
    public void paint(Graphics g) {
        g.drawOval(a, b, 1, 1);
    }
   
    public void update(Graphics g) {
        paint(g);
    }
    // TODO overwrite start(), stop() and destroy() methods
}