How to Create a Jdialog class that returns a boolean parameter

Question

I'm trying to subclass a jdialog to return a boolean to another callling class, the parameter is return when the jdialog closes, how do i declare such a class and what method do i call on the windowclosed event
I'm new to java so need some code sample, the program is to implement a login and password verification.
thanks in advance for any assistance.

Answer 1

Here's another way (a third way is to make the dialog form an inner class)
in this eg, the password is hard-coded as java
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class MainWindow extends JFrame
  JLabel lbl = new JLabel("JLabel");
  JButton btn = new JButton("JButton");
  boolean loggedInOK = false;
  public MainWindow()
    new FTILogin_Jdia2(this, true).show();
    if(!loggedInOK) System.exit(0);
    buildGUI();
  public void buildGUI()
    setLocation(400,300);
    setSize(150,85);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JPanel jp = new JPanel(new BorderLayout());
    jp.add(lbl,BorderLayout.NORTH);
    jp.add(btn,BorderLayout.SOUTH);
    getContentPane().add(jp);
    setVisible(true);
  public static void main(String[] args){new MainWindow();}
class FTILogin_Jdia2 extends javax.swing.JDialog implements ActionListener
  JTextField tf = new JTextField(10);
  String password = "java";
  MainWindow mainWindow;
  public FTILogin_Jdia2(MainWindow parent, boolean modal)
    setModal(modal);
    mainWindow = parent;
    initComponents();
  public void initComponents()
    setLocation(400,300);
    getContentPane().setLayout(new BorderLayout());
    JPanel top = new JPanel();
    top.add(new JLabel("Password: "));
    top.add(tf);
    getContentPane().add(top,BorderLayout.NORTH);
    JButton btn = new JButton("OK");
    btn.addActionListener(this);
    getContentPane().add(btn,BorderLayout.SOUTH);
    pack();
  public void actionPerformed(ActionEvent e)
    if(tf.getText().equals(password))
      mainWindow.loggedInOK = true;
    dispose();
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