// EDIT: in response to comment
public static void showMessageDialog(Component parent, Object message, int timeout) {
// run all of this on the EDT
final JOptionPane optionPane = new JOptionPane(message);
String title = UIManager.getString("OptionPane.messageDialogTitle");
// int style = styleFromMessageType(JOptionPane.INFORMATION_MESSAGE);
final JDialog dialog = optionPane.createDialog(parent, title);
// timeout default is 5000 milliseconds
Timer timer = new Timer(timeout, new AutoDismiss(dialog));
timer.setRepeats(false);
timer.start();
if (dialog.isDisplayable()) dialog.setVisible(true);
}
