Java Tips - How to create a ProgressMonitor toolbar

This Java Swing tip illustates a method of creating a ProgressMonitor toolbar. This example includes a timer used to induce progress. Th example also shows how to use the UIManager properties associated with progress monitors.


import java.awt.*;

import java.awt.event.*;

import javax.swing.*;



public class ProgressMonitorExample extends JFrame 

        implements ActionListener {

    

    static ProgressMonitor pbar;

    static int counter = 0;

    

    public ProgressMonitorExample() {

        super("Progress Monitor Demo");

        setSize(250,100);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        

        pbar = new ProgressMonitor(null, "Monitoring Progress",

                "Initializing . . .", 0, 100);

        

        // Fire a timer every once in a while to update the progress.

        Timer timer = new Timer(500, this);

        timer.start();

        setVisible(true);

    }

    

    public static void main(String args[]) {

        UIManager.put("ProgressMonitor.progressText", "This is progress?");

        UIManager.put("OptionPane.cancelButtonText", "Go Away");

        new ProgressMonitorExample();

    }

    

    public void actionPerformed(ActionEvent e) {

        // Invoked by the timer every half second. Simply place

        // the progress monitor update on the event queue.

        SwingUtilities.invokeLater(new Update());

    }

    

    class Update implements Runnable {

        public void run() {

            if (pbar.isCanceled()) {

                pbar.close();

                System.exit(1);

            }

            pbar.setProgress(counter);

            pbar.setNote("Operation is "+counter+"% complete");

            counter += 2;

        }

    }

}

Related Tips