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PO
 

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    <p>The problem is, you're trying to update the progress within the context of the Event Dispatching Thread.</p> <p>This basically means that while you are in you loop, the EDT is unable to process any paint request you are making.</p> <p>What you need to do is some how offload the work to a separate thread and update the progress bar as needed. The problem with this, is you should never update the UI from any thread other then the EDT.</p> <p>But don't despair, you have a number of options, the best is using a <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/worker.html" rel="nofollow noreferrer">Swing Worker</a></p> <p><strong>Updated with example</strong></p> <p><img src="https://i.stack.imgur.com/h9HLH.png" alt="enter image description here"></p> <pre><code>public class SwingWorkerProgress { public static void main(String[] args) { new SwingWorkerProgress(); } public SwingWorkerProgress() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private JProgressBar pbProgress; private JButton start; public TestPane() { setBorder(new EmptyBorder(10, 10, 10, 10)); pbProgress = new JProgressBar(); setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.insets = new Insets(4, 4, 4, 4); gbc.gridx = 0; gbc.gridy = 0; add(pbProgress, gbc); start = new JButton("Start"); gbc.gridy++; add(start, gbc); start.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { start.setEnabled(false); ProgressWorker pw = new ProgressWorker(); pw.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { String name = evt.getPropertyName(); if (name.equals("progress")) { int progress = (int) evt.getNewValue(); pbProgress.setValue(progress); repaint(); } else if (name.equals("state")) { SwingWorker.StateValue state = (SwingWorker.StateValue) evt.getNewValue(); switch (state) { case DONE: start.setEnabled(true); break; } } } }); pw.execute(); } }); } } public class ProgressWorker extends SwingWorker&lt;Object, Object&gt; { @Override protected Object doInBackground() throws Exception { int i = 0; int max = 2000; while (i &lt; max) { i += 10; int progress = Math.round(((float)i / (float)max) * 100f); setProgress(progress); try { Thread.sleep(25); } catch (Exception e) { e.printStackTrace(); } } return null; } } } </code></pre>
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    1. COI am trying to extract some of the code from your example to my application. I am not sure as in what parts to copy
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    2. COStart with everything, run it a few times, add some break points in or `System.out.println` statements so you can understand the flow. The two most important aspects are `ProgressWorker` and the code inside the `start` button's `ActionListener`
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    3. COOh, since when did you decide to use __try multi catch__? ;)
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