Question

I am a beginner in java .So please let me know how can i simultaneously run the progress bar and my application code together.In other words i want to make my progressbar to increment as long as my application code is doing some processing.Please elaborate it with code.
What i think is that i have to add two threads simultaneously.One thread updating the progressbar thread but i am not sure whether its the right way or not.
i have written this code for incrementing progress bar (hard coded)

       class ProgressMonitor implements Runnable {

    public void run() {
        jProgressBar1.setStringPainted(true);
        //run untill 100% complete
        while (progress < 100) {
            //update the progressbar
            jProgressBar1.setValue(++progress);
            jProgressBar1.repaint();
            try {

                //Sleep for .25 second
                Thread.sleep(250);
            } catch (InterruptedException ex) {
            }
        }

    }   

Answer 1

The problem is basically that the long running task blocks the Event Dispatch Thread that updates the GUI. One solution is to do the work in a SwingWorker.

An abstract class to perform lengthy GUI-interaction tasks in a background thread. ..

See also the Concurrency in Swing lesson of the tutorial for more details.