setvisible method in java swing hangs system

Question

I have banking gui application that I am currently working on and there seems to be a problem with the setvisible method for my jdialog. After the user has withdrawn a valid

Answer 1

First, it is recommended to do all the GUI updates in the Swing Event-Dispatch thread, i.e. using the SwingUtilites class.

Second, your JDialog is modal and so blocks the thread in which the setVisible(true) method is called (in your case the Main thread, in the following case the Swing Event-Dispatch Thread).

I do not say the following code is perfect, but it should put you on the track...

final JDialog waitForTrans = new JDialog((JFrame) null, true);

SwingWorker worker = new SwingWorker() {

  public String doInBackground() throws Exception {
    Thread.sleep(5000);
    return null;
  }

  public void done() {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        waitForTrans.setVisible(false);
        waitForTrans.dispose();
      }
    });
  }

};

worker.execute();
SwingUtilities.invokeLater(new Runnable() {
  public void run() {
    waitForTrans.add(new JLabel("Please Wait..."));
    waitForTrans.setMinimumSize(new Dimension(300, 100));
    waitForTrans.setVisible(true);
  }
});

Hope this helps.