JProgressBar while file copy

Question

Hello,
I give backup option in my application.
so while taking backup (just file copy), i need to show the status of the file copying in JProgressbar
Can any one give solution with sample.

Answer 1

import java.awt.*;
import javax.swing.*;
public class X {
    public static void main(String[] args) {
        JFrame f = new JFrame("X");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JProgressBar bar = new JProgressBar(0,100);
        bar.setStringPainted(true);
        final Updater updater = new Updater(bar);
        f.getContentPane().add(bar, BorderLayout.NORTH);
        f.pack();
        f.show();
        Runnable example = new Runnable() {
            public void run() {
                for(int i=0; i<=100; i+=5) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                    updater.update(i);
        new Thread(example).start();
class Updater  {
    private final JProgressBar jpb;
    private boolean queued;
    private int val;
    private Runnable runnable = new Runnable() {
        public void run() {//called from EDT:
            int _val;
            synchronized(Updater.this) {
                queued = false;
                _val = val;
            jpb.setValue(_val);
    public Updater(JProgressBar jpb) {
        this.jpb = jpb;
    public void update(int _val) {
        boolean go = false;
        synchronized(this) {
            val = _val;
            if (!queued) {
                queued = true;
                go = true;
        if (go)
            SwingUtilities.invokeLater(runnable);
}1. I'm assuming you're backing up in a non-EDT thread, to avoid locking up your GUI.
2. If 1 is true, you have to be careful to call Swing using methods like SwingUtilities.invokeLater. See:
http://java.sun.com/docs/books/tutorial/uiswing/overview/threads.html
3. My Updater class is the heart of this example. It is smart enough to update the progress bar's future value while this value is queued for the EDT.