CODEWITHSUNDEEP
swing
prakash_d22
prakash_d22

Reputation: 1163

jprogressbar in swing

Hi. I'm preparing a form in java where I want to show a progress bar from value 1 to 5 in an interval of 0.5 seconds each, but, in my code, the progress bar jumps directly from 1 to 5 after 2.5 secs .. Please help me with the code...

    public class cafee extends JFrame implements ActionListener {
JProgressBar pr1;
JButton b1;

public cafee() {
    setLayout(new FlowLayout());
    pr1 = new JProgressBar();
    pr1.setSize(10, 1);

    pr1.setForeground(Color.blue);
    pr1.setMinimum(0);
    pr1.setMaximum(5);
    pr1.setValue(0);
    pr1.setVisible(true);
    b1 = new JButton();
    b1.setVisible(true);

    add(pr1);
    add(b1);
    b1.addActionListener(this);
}

public void actionPerformed(ActionEvent ae) {
    if (ae.getSource() == b1) {
        for (int a = 1; a <= 5; a++) {

            try {
                                     pr1.setValue(a);
                Thread.sleep(500);
            } catch (Exception e) {
            }

        }
    }
}

public static void main(String[] args) {
    cafee caf = new cafee();
    caf.setVisible(true);
    caf.setSize(500, 500);
}

}

Upvotes: 0

Views: 108

Answers (1)

JB Nizet
JB Nizet

Reputation: 691625

If you sleep in the event dispatch thread (EDT), you're blocking it, and thus preventing all the other event handling and painting methods to occur. JProgressBar is useful to display the progress of some task running in a separate background thread.

Use a SwingWorker. Its api doc contains an easy to understand example.

Upvotes: 1

Related Questions