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copied!<p>Here's some basis for you to look at, if you can study it and understand why every piece of code is there then I think it will help. Feel free to ask questions in a comment (although I'm going to bed right now!)</p> <p><strong>Example:</strong></p> <pre><code>public class ProgressBarDemo extends JFrame { private final JProgressBar progressBar = new JProgressBar(0, 100); private int progressCounter = 0; public ProgressBarDemo() { setContentPane(progressBar); setPreferredSize(new Dimension(100, 100)); setDefaultCloseOperation(EXIT_ON_CLOSE); pack(); new Thread(new Runnable() { public void run() { while (progressCounter <= 100) { SwingUtilities.invokeLater(new Runnable() { public void run() { progressBar.setValue(progressCounter++); } }); try { Thread.sleep(500); } catch (InterruptedException e) {} } } }).start(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new ProgressBarDemo().setVisible(true); } }); } } </code></pre> <p>Two different ways to approach the problem, using SwingWorker instead:</p> <p><strong>SwingWorker Example 1:</strong></p> <pre><code> .... public ProgressBarDemo() { setContentPane(progressBar); setPreferredSize(new Dimension(100, 100)); setDefaultCloseOperation(EXIT_ON_CLOSE); pack(); SwingWorker<Integer, Void> worker = new SwingWorker<Integer,Void>() { public Integer doInBackground() { while (progressCounter <= 100) { setProgress(progressCounter++); try { Thread.sleep(500); } catch (InterruptedException e) {} } return 0; } }; worker.addPropertyChangeListener(new PropertyChangeListener() { public void propertyChange(PropertyChangeEvent event) { if ("progress".equals(event.getPropertyName())) { progressBar.setValue((Integer)event.getNewValue()); } } }); worker.execute(); } .... </code></pre> <p><strong>SwingWorker Example 2 (not so nice, but interesting nonetheless):</strong></p> <pre><code> .... public ProgressBarDemo() { setContentPane(progressBar); setPreferredSize(new Dimension(100, 100)); setDefaultCloseOperation(EXIT_ON_CLOSE); pack(); new SwingWorker<Integer,Integer>() { public Integer doInBackground() { while (progressCounter <= 100) { publish(progressCounter++); try { Thread.sleep(500); } catch (InterruptedException e) {} } return 0; } public void process(List<Integer> progresses) { Integer maxProgress = null; for (int progress : progresses) { if (maxProgress == null || progress > maxProgress) { maxProgress = progress; } } progressBar.setValue(maxProgress); } }.execute(); } .... </code></pre>

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