Resetting JProgressBar

Question

The JProgressBar works great using a separate thread for the process and a Runnable thread for progress (calling SwingUtilities.invokeLater()), but I cannot get the darn thing to reset back to 0 for another run. A simple call to progressBar.setValue(0); does not accomplish this. Setting a reset flag (boolean) checked within the Runnable and calling SwingUtilities.invokeLater() doesn't accomplish this either. How the heck do I reset the progress bar for multiple successive activities?
Thanks,
Robert Templeton

Answer 1

This works for me:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
public class ProgressExample extends JFrame implements ActionListener, Runnable {
     private JProgressBar progress = new JProgressBar(0, 100);
     private JButton start = new JButton("Start!");
     private static int[] sleeps = {20, 10, 40}; //milliseconds
     public ProgressExample() {
          super("Progress example");
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JPanel cp = (JPanel)getContentPane();
          cp.add(progress, BorderLayout.NORTH);
          start.addActionListener(this);
          cp.add(start);
          pack();
          setVisible(true);
     public void actionPerformed(ActionEvent e) {
          start.setEnabled(false);
          new Thread(this).start();
     public void run() {
          for (int sleep : sleeps) {
               progress.setValue(0);
               for (int i=1; i<101; i++) {
                    try {
                         Thread.sleep(sleep);
                    } catch (InterruptedException e) {
                         break;
                    progress.setValue(i);
          start.setEnabled(true);
     public static void main(String[] args) {
          new ProgressExample();
}-Muel