ProgressMonitor dialog doesn't go away

Question

When I run the ProgressMonitor demo found in the tutorial (on [http://java.sun.com/docs/books/tutorial/uiswing/components/progress.html#monitors|http://java.sun.com/docs/books/tutorial/uiswing/components/progress.html#monitors] ), the ProgressMonitor doesn't go away when the task is complete.
If I press the "Start" button again, I get two ProgressMonitors, one showing the old status of 100%, and another one showing the current progress. (You have to move the dialog windows around to see both of them.)
How do I make the ProgressMonitor dialog disappear? Calling the close() method doesn't do it.
Claus

Answer 1

I don't understand this. I have a problem with a demonstration program that is available on Sun's own web site. The program is already extremely short and concise. Do you want me to download it and upload it again?
Anyway, here it is:
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
* [rest of copyright comment removed. Please forgive me, Sun.]
package components;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.beans.*;
import java.util.Random;
public class ProgressMonitorDemo extends JPanel
                                 implements ActionListener,
                                            PropertyChangeListener {
    private ProgressMonitor progressMonitor;
    private JButton startButton;
    private JTextArea taskOutput;
    private Task task;
    class Task extends SwingWorker<Void, Void> {
        @Override
        public Void doInBackground() {
            Random random = new Random();
            int progress = 0;
            setProgress(0);
            try {
                Thread.sleep(1000);
                while (progress < 100 && !isCancelled()) {
                    //Sleep for up to one second.
                    Thread.sleep(random.nextInt(1000));
                    //Make random progress.
                    progress += random.nextInt(10);
                    setProgress(Math.min(progress, 100));
            } catch (InterruptedException ignore) {}
            return null;
        @Override
        public void done() {
            Toolkit.getDefaultToolkit().beep();
            startButton.setEnabled(true);
            progressMonitor.setProgress(0);
    public ProgressMonitorDemo() {
        super(new BorderLayout());
        //Create the demo's UI.
        startButton = new JButton("Start");
        startButton.setActionCommand("start");
        startButton.addActionListener(this);
        taskOutput = new JTextArea(5, 20);
        taskOutput.setMargin(new Insets(5,5,5,5));
        taskOutput.setEditable(false);
        add(startButton, BorderLayout.PAGE_START);
        add(new JScrollPane(taskOutput), BorderLayout.CENTER);
        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
     * Invoked when the user presses the start button.
    public void actionPerformed(ActionEvent evt) {
        progressMonitor = new ProgressMonitor(ProgressMonitorDemo.this,
                                  "Running a Long Task",
                                  "", 0, 100);
        progressMonitor.setProgress(0);
        task = new Task();
        task.addPropertyChangeListener(this);
        task.execute();
        startButton.setEnabled(false);
     * Invoked when task's progress property changes.
    public void propertyChange(PropertyChangeEvent evt) {
        if ("progress" == evt.getPropertyName() ) {
            int progress = (Integer) evt.getNewValue();
            progressMonitor.setProgress(progress);
            String message =
                String.format("Completed %d%%.\n", progress);
            progressMonitor.setNote(message);
            taskOutput.append(message);
            if (progressMonitor.isCanceled() || task.isDone()) {
                Toolkit.getDefaultToolkit().beep();
                if (progressMonitor.isCanceled()) {
                    task.cancel(true);
                    taskOutput.append("Task canceled.\n");
                } else {
                    taskOutput.append("Task completed.\n");
                startButton.setEnabled(true);
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("ProgressMonitorDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        JComponent newContentPane = new ProgressMonitorDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
Claus