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copied!<p>As @happyburnout has pointed out, you'd be better of processing you download in a separate thread, using a <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/SwingWorker.html" rel="nofollow">SwingWorker</a> is probably the best solution for what you are doing.</p> <p>The main reason is you're blocking the <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html" rel="nofollow">Event Dispatching Thread</a> (AKA EDT) from running, preventing any repaint requests (and other UI important things) from been processed.</p> <p>You should have a read through</p> <ul> <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html" rel="nofollow">Concurrency in Swing</a></li> <li><a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="nofollow">Worker Threads and Swing Worker</a></li> </ul> <p>Now this is taken almost directly from the API docs, but gives a basic idea of a <code>SwingWoker</code> with a <code>JProgressBar</code></p> <p>The "Worker"...</p> <pre><code>public class Worker extends SwingWorker<Object, Object> { @Override protected Object doInBackground() throws Exception { // The download code would go here... for (int index = 0; index < 1000; index++) { int progress = Math.round(((float)index / 1000f) * 100f); setProgress(progress); Thread.sleep(10); } // You could return the down load file if you wanted... return null; } </code></pre> <p>The "progress pane"</p> <pre><code>public class ProgressPane extends JPanel { private JProgressBar progressBar; public ProgressPane() { setLayout(new GridBagLayout()); progressBar = new JProgressBar(); add(progressBar); } public void doWork() { Worker worker = new Worker(); worker.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { if ("progress".equals(evt.getPropertyName())) { progressBar.setValue((Integer) evt.getNewValue()); } } }); worker.execute(); } } </code></pre> <p>Remember the golden rules of Swing</p> <ul> <li>Never, never, never update a UI component from any <code>Thread</code> other then the EDT</li> <li>Always perform time consuming tasks on a different <code>Thread</code></li> <li>(Something, something, something about layout managers - that's more of a personal thing ;))</li> </ul> <p>And you will have a happy and easy time with Swing :D</p>

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