Sun(TM) code would not compile

Question

http://java.sun.com/products/java-media/2D/samples/suite/index.html
Images>"Animated gif with a transparent background."
I have been having problems compiling all of the sun code. I am using Windows XP. The code I create, and the code we create in class works fine, but Sun's(TM) code does not seem to work. I want to use pictures in a game. Also I would like to be able to tell what key(s) are being held down (I am programming a game). Thanks for any ideas you have.
* @(#)DukeAnim.java     1.6 98/12/03
* Copyright 1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
import java.awt.*;
import java.awt.event.*;
import java.awt.image.ImageObserver;
import java.awt.image.BufferedImage;
import javax.swing.*;
import java.net.URL;
* The DukeAnim class displays an animated gif with a transparent background.
public class DukeAnim extends JApplet implements ImageObserver {
private static Image agif, clouds;
private static int aw, ah, cw;
private int x;
private BufferedImage bimg;
public void init() {
setBackground(Color.white);
clouds = getDemoImage("clouds.jpg");
agif = getDemoImage("duke.running.gif");
aw = agif.getWidth(this) / 2;
ah = agif.getHeight(this) / 2;
cw = clouds.getWidth(this);
public Image getDemoImage(String name) {
URL url = DukeAnim.class.getResource(name);
Image img = getToolkit().getImage(url);
try {
MediaTracker tracker = new MediaTracker(this);
tracker.addImage(img, 0);
tracker.waitForID(0);
} catch (Exception e) {}
return img;
public void drawDemo(int w, int h, Graphics2D g2) {
if ((x -= 3) <= -cw) {
x = w;
g2.drawImage(clouds, x, 10, cw, h-20, this);
g2.drawImage(agif, w/2-aw, h/2-ah, this);
public Graphics2D createGraphics2D(int w, int h) {
Graphics2D g2 = null;
if (bimg == null || bimg.getWidth() != w || bimg.getHeight() != h) {
bimg = (BufferedImage) createImage(w, h);
g2 = bimg.createGraphics();
g2.setBackground(getBackground());
g2.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g2.clearRect(0, 0, w, h);
return g2;
public void paint(Graphics g) {
     Dimension d = getSize();
Graphics2D g2 = createGraphics2D(d.width, d.height);
drawDemo(d.width, d.height, g2);
g2.dispose();
g.drawImage(bimg, 0, 0, this);
// overrides imageUpdate to control the animated gif's animation
public boolean imageUpdate(Image img, int infoflags,
int x, int y, int width, int height)
if (isShowing() && (infoflags & ALLBITS) != 0)
repaint();
if (isShowing() && (infoflags & FRAMEBITS) != 0)
repaint();
return isShowing();
public static void main(String argv[]) {
final DukeAnim demo = new DukeAnim();
demo.init();
JFrame f = new JFrame("Java 2D(TM) Demo - DukeAnim");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();

Answer 1

Actually it compiles but gives me the following error. I think it has a problem dowloading the images. I am connected to the net, and my other java stuff works fine, including downloading from the net.
Uncaught error fetching image:
java.lang.NullPointerException
at sun.awt.image.URLImageSource.getConnection(URLImageSource.java:99)
at sun.awt.image.URLImageSource.getDecoder(URLImageSource.java:108)
at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:251)
at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:168)
at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136)