如何用我想要的行为关闭JDialog？

Question

我刚刚开始学习Java，所以请温柔地对待我。我发现框架和对话框的默认关闭行为令人困惑。

我正在尝试使用Swing创建一个简单的登录对话框。我为对话框取了JDialog。我只是希望当用户点击登录按钮后，在执行身份验证后，我希望关闭登录窗口，但要打开另一个窗口。

但是，如果用户点击关闭按钮，则应关闭登录框，但应用程序也必须结束。

我知道如何编写动作侦听器和身份验证代码。我只需要帮助了解我必须实施哪些近距离行为。

到目前为止，这是我的代码（仅限相关代码段）。更多具体问题出现在动作听众附近的评论中。

package practice.bookyard.client;

import javax.swing.SwingUtilities;

public class Program {

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new LoginDialogEventLoop());     
    }

}


public class LoginDialogEventLoop implements Runnable {

    @Override
    public void run() {

        // Create and set title
        JDialog dialog = new LoginDialog("Bookyard Login");

        // Set default close behavior
        dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

        // Set size
        dialog.setSize(400, 300);
        // dialog.setResizable(false);

        // Set position on the screen
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        dialog.setLocation((int)screenSize.getWidth() / 2, (int)screenSize.getHeight() / 2);
        dialog.setLocationRelativeTo(null);

        dialog.setVisible(true);
    }

}

public class LoginDialog extends JDialog {

    private static final long serialVersionUID = 1L;

    protected JLabel lblTopSpace = null;
    protected JPanel loginPanel = null;
    protected JPanel statusPanel = null;

    public LoginDialog(String title) {

        super((Dialog)null);

        this.setTitle(title);

        Initialize();
    }

    protected void Initialize() {

        // DONE: add a panel and add controls to the panel
        ...
    }
}





public class LoginPanel extends JPanel {

    private static final long serialVersionUID = 1L;

    protected JLabel lblUserName;
    protected JLabel lblPassword;
    protected JTextField txtUserName;
    protected JPasswordField txtPassword;
    protected JButton btnLogin;
    protected JButton btnCancel;

    public LoginPanel() {
        super();

        this.Initialize();
    }

    protected void Initialize() {

        this.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();

        // Create controls
        lblUserName = new JLabel("User Name: ");
        lblPassword = new JLabel("Password: ");
        txtUserName = new JTextField(15);
        txtPassword = new JPasswordField(15);
        txtPassword.setEchoChar('*');
        btnLogin = new JButton("Login");
        btnCancel = new JButton("Cancel");

        // Set them on the panel using the constraints
        // 3 rows, 3 columns
        // DONE ALREADY
        ...



        btnLogin.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // authenticate user: I know how to do this

                // how do I close the login JDialog
                // of course, I will need a reference to the dialog here
                // which is not a big deal. I can have that be passed
                // in via a constructor.
                // So, supposing this 'dialog' variable represented the
                // login dialog
                JDialog dialog = new JDialog((Dialog)null);

                // What's the method to close this window?
                // I believe it is dispose()
                // But will calling the dispose method also
                // exit the main thread since this is the 
                // only window in the application?
                // Also, should I be launching the new window from here?
                // or from within the main() of the application?
                // Is there a way this dialog can communicate to its
                // creator what the dialog result was -- Login or Cancel?
                dialog.dispose();

                JFrame frame = new JFrame("New Window");
                frame.setSize(400,  400);
                frame.setVisible(true);


            }
        });

        btnCancel.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // So, supposing this 'dialog' variable represented the
                // login dialog
                JDialog dialog = new JDialog((Dialog)null);

                // This one is a bit easier
                // But since this is a JDialog and not a JFrame
                // I cannot set the default close behavior
                // to EXIT_ON_DISPOSE. I can only set it to:
                // HIDE ON DISPOSE
                // CLOSE ON DISPOSE
                // DO NOTHING ON DISPOSE
                // And since I have set it to CLOSE ON DISPOSE in Program.java
                // just calling dispose() on this will keep the application
                // still alive, right?
                dialog.dispose();
            }
        });

    }
}