Question

Does exist in the JDialog class a way to prevent that a child window (JDialog) would be displayed more than once when the button from the main window (JFrame) used to open it, is pressed several times? Many thanks in advance!

Answer 1

Yes, and you don’t need to make the box modal to do it (although making it modal would be the easiest way).

Simply do something like the following

In your member delcarations:

private final MyDialog dialog = new MyDialog();

In your code:

private void showDialog() {
   dialog.setVisible(true);
   dialog.requestFocus(); // May be needed to bring window to front
}

This will ensure that you only instantiate the box once. Simply call showDialog() whenever the button is pressed.