Why won't this slide show run it compiles

Question

import java.awt.*;
import java.applet.*;
import java.net.*;
public class SlideShow extends Applet {
  private Image[] images;
  private String[] text;
  private Label captions;
  private volatile int curFrame;
  private Thread timerThread;
  private volatile boolean noStopRequested;
  private boolean paused;
  private final Object pauseLock = new Object();
  public static void main( String[] args )
     new SlideShow();     
  private void printThreadName(String prefix) {
    String name = Thread.currentThread().getName();
    System.out.println(prefix + name);
  public void init() {
    images = new Image[3];
    text = new String[3];
    captions = new Label();
    setLayout(new BorderLayout());
    add(BorderLayout.SOUTH, captions);
    Label name = new Label("by Claude Monet");
    name.setAlignment(Label.CENTER);
    add(BorderLayout.EAST, name);
    URL fig = null;
    try {
      fig = new URL("http://developer.java.sun.com:8080/" +
                   "developer/technicalArticles/Threads/applet/");
    } catch (java.net.MalformedURLException ex) {
      System.out.println("Bad URL");
      return;
    images[0] = getImage(fig, "bordighera.jpg");
    images[1] = getImage(fig, "etretat.jpg");
    images[2] = getImage(fig, "leyden.jpg");
    text[0] = "Garden in Bordighera";
    text[1] = "Rock Arch West of Etretat";
    text[2] = "Bulbfield and Windmill near Leyden";
    printThreadName("init is ");
    startThread();
   private void startThread() {
     paused = true;
     noStopRequested = true;
     // Use this inner class to hide the public run method
     Runnable r = new Runnable() {
       public void run() {
         runWork();
     timerThread = new Thread(r, "Timer");
     timerThread.start();
     printThreadName("startThread is ");
  private void stopThread() {
    noStopRequested = false;
    timerThread.interrupt();
    printThreadName("stopThread is ");
  private void runWork() { // note that this is private
    printThreadName("run is ");
    curFrame = 0;
    try {
        while ( noStopRequested ) {
        waitWhilePaused();
        curFrame = ( curFrame + 1 ) % images.length;
        repaint();
        Thread.sleep(3000);
    } catch ( InterruptedException x ) {
      // reassert interrupt
     Thread.currentThread().interrupt();
     System.out.println("interrupt and return from run");
  private void setPaused(boolean newPauseState) {
    synchronized ( pauseLock ) {
      if ( paused != newPauseState ) {
        paused = newPauseState;
        pauseLock.notifyAll();
  private void waitWhilePaused() throws InterruptedException {
    synchronized ( pauseLock ) {
      while ( paused ) {
        pauseLock.wait();
  public void paint(Graphics g) {
    update(g);
    printThreadName("paint is ");
  public void update(Graphics g) {
    g.drawImage(images[curFrame], 0, 0, this);
    captions.setText(text[curFrame]);
    printThreadName("update is ");
  public void start() {
    setPaused(false);
    printThreadName("start is ");
  public void stop() {
    setPaused(true);
    printThreadName("stop is ");
  public void destroy() {
    stopThread();
    for (int i = 0; i < images.length; i++) {
       images.flush();
images[i] = null;
text[i] = null;
images = null;
text = null;
printThreadName("destroy is ");

Answer 1

w.r.t. the title of your topic: the set C of compilable programs is much
larger than the set R of programs that run correctly: |C| > |R|. This
is implies that at most n == |C|-|R| programs need some debugging.
The easiest form of debugging (oftenly overlooked) is System.out.println
which, when applied strategically, can do wonders: when two of those
printlns are inserted at point X and Y, and if at point X everything seems
to be correct while at point Y (later in time) everything seems to be rotten
to the bone, inserting another println at point (X+Y)/2 narrows down the
exact location of where the ugly bug hides from you.
kind regards,
Jos