Dialog/Frame window not closing

Question

I have an instruction dialog that pops up in an application, but if the close (X) is pressed it doesn't close the dialog/Frame.
Dimension dem = getSize();
               Frame r = new Frame();                    
               Dialog d = new Dialog(r);
               TextArea t = new TextArea("",100,100,TextArea.SCROLLBARS_NONE);
               t.setBackground(new Color(0,0,102));
               t.setForeground(Color.white);
               t.setFont(new Font("Helvetica",6,14));
               t.append(
                    "Grammar Checking Instructions: "+"\n\n"+
                    " -Use the Lexicon provided to creates a sentence for grammatical"+"\n"+
                    " checking."+"\n"+
                    " -The sentence can be typed in the text field provided or the user can"+"\n"+
                    " load a sentence from a file. (*.txt format)"+"\n"+
                    " -Press the 'Check Sentence' button for the sentence to be analyzed"+"\n\n"+
                    "Grammar Rules: "+"\n\n"+
                    " S -> NP Pred"+"\n"+
                    " Pred -> v NP PP | v PP NP | v NP | v PP | v"+"\n"+
                    " PP -> p NP"+"\n"+
                    " NP -> det. NP* | NP*"+"\n"+
                    " NP* -> adj NP* | n");
               d.add(t);
               d.setTitle("Grammar Checking");
               d.setSize(475,300);
               d.setLocation(dem.height/2 -140,dem.width/2 -40);
               d.setResizable(false);
               d.show();
               r.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}});     
thanks for the help,
steve

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JFrame {
  JDialog myDialog;
  public Test() {
    myDialog = new JDialog(this,"Sample Dialog");
    myDialog.setSize(50,50);
    myDialog.getContentPane().add(new JLabel("Hello"));
    JPanel content = (JPanel)getContentPane();
    JButton myButton = new JButton("Dialog");
    content.add(myButton);
    myButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
     myDialog.show();
    addWindowListener(new WindowAdapter() {
      public void windowClosed(WindowEvent e) { System.exit(0); }
  public static void main(String[] args) {
    Test test = new Test();
    test.setSize(100,100);
    test.show();
}