WindowClosing doesn't completely close a frame

Question

I wrote a simple command line application that needs to prompt for a username and a password. Since the characters are always echoed in Java, the alternative way to do this is to call a GUI with a password-textfield. I am able to obtain the login credentials, and to dispose of the login pop-up window, but the program doesn't return unless I hit Ctrl+C.
Calling System.exit(0) does the job but not quite. I was hoping whether there is a way to completely destroy the Login GUI without having to warn the user of this class to call System.exit(0) each time the Login box is used. Most of the times the user doesn't even know that this class is called.
Is there any dispose, exit, close or whatever method that does this?
(It could be any of the classes: javax.swing.JDialog, java.awt.Frame etc.)

Answer 1

The goal is to totally get rid of the GUI threads still running on the background, not to just set the visibility to false. However, thanks to your code, with a couple of modifications, I figured out the solution.
I read the workaround in some other topic:
How to kill AWT-Windows thread - submitted on Dec 14, 2000.
If I set the window to null it does what I want.
Thanks!
import java.awt.*;
import java.awt.event.*;
public class temp {
public static void main(String args[]) {
ClosingWindow w = new ClosingWindow();
w = null;
class ClosingWindow extends Frame implements WindowListener {
public ClosingWindow() {
this.setTitle("temp frame");
this.add(new Label("Hit the close button!"));
this.addWindowListener(this);
this.setSize(400,200);
this.setVisible(true);
//Here are the event catchers
public void windowActivated(WindowEvent e) { }
public void windowClosed(WindowEvent e) { }
//This should clear up your window
public void windowClosing(WindowEvent e) {
setVisible(false);
dispose();
public void windowDeactivated(WindowEvent e) { }
public void windowDeiconified(WindowEvent e) { }
public void windowIconified(WindowEvent e) { }
public void windowOpened(WindowEvent e) { }