Java - repaint component every second?

Question

I would like to repaint component after each second, but it didn't work. What I am trying is:

    try{
        while(true){
            Thread.currentThread().sleep(1000);
            gc.cb.next();
            gc.repaint();
        }
    }
    catch(Exception ie){
    }

Answer 1

I would advise using a javax.swing.Timer for this problem, which will periodically fire an ActionEvent on the Event Dispatch thread (note that you should only call repaint and / or manipulate Swing components from this thread). You can then define an ActionListener to intercept the event and repaint your component at this point.

Example

JComponent myComponent = ...
int delay = 1000; //milliseconds

ActionListener taskPerformer = new ActionListener() {
  public void actionPerformed(ActionEvent evt) {
    myComponent.repaint();
  }
};

new Timer(delay, taskPerformer).start();

Also note that SwingWorker is probably inappropriate as it is typically used for background tasks that have a defined start and end, rather than a periodic task.