Need help with double buffering

Question

Hi!
I'm trying to write an animated applet the shows the Java Duke waving.
No problem getting it to work, but the applet is flickering and I sence the need for double buffering.
I've tried to use "traditional" double buffering techniques without success. Something like this:
currentDuke = bufferGraphics.getGraphics();
public void update(Graphics g) {
    bufferGraphics.clearRect(0, 0, this.getWidth(), this.getHeight());
    paint(g);
public void paint(Graphics g) {
    bufferGraphics.drawImage(nextDuke, 0, 0, this);
    g.drawImage(currentDuke, 0, 0, this);
}Didn't help...
Here's my current code:
import javax.swing.*;
import java.awt.*;
* This is a simple animation applet showing Duke waving.
* @author Andrew
* @version 1.0 2002-07-04
public class WavingDuke extends JApplet implements Runnable {
    private Image[] duke;
    private Image currentDuke;
    private Thread wave;
     * Called by the browser or applet viewer to inform this applet that it has
     * been loaded into the system.
    public void init() {
        loadDuke();
        currentDuke = this.createImage(this.getWidth(), this.getHeight());
     * Called by the browser or applet viewer to inform this applet that it
     * should start its execution.
    public void start() {
        if (wave == null) {
            wave = new Thread(this);
            wave.start();
     * Loads all the duke images into a <code>Image</code> array.
    private void loadDuke() {
        duke = new Image[10];
        for (int i = 0; i < 10; i++) {
            duke[i] = this.getImage(this.getCodeBase(), "images/duke"+i+".gif");
     * Method cycles through different images and calls <code>repaint</code>
     * to make an animation. After each call to <code>repaint</code> the thread
     * sleeps for predefined amount of time.
    public void run() {
        while (true) {
            for (int i = 0; i < 10; i++) {
                currentDuke = duke;
repaint();
paus(150);
* Method makes the current thread to sleep for tha amount of time
* specified in parameter <code>ms</code>.
* @param ms The time to wait specified in milliseconds.
private void paus(int ms) {
try {
Thread.sleep(ms);
} catch (InterruptedException ie) {
System.err.println(ie.getMessage());
* Updates this component.
* @param g The specified context to use for updating.
public void update(Graphics g) {
paint(g);
* Paints this component.
* @param g The graphics context to use for painting.
public void paint(Graphics g) {
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.drawImage(currentDuke, 0, 0, this);
Thanks in advance!
/Andrew

Answer 1

I've solved it!
/Andrew