如何在不关闭另一个的情况下关闭 JFrame

Question

I know this question has been addressed many times, but I tried everything to make it work properly. First and foremost, I create a JDialog as my loading pop-up when the user login is legitimate. Then I create a Timer to automatically dismiss the frame, and my main menu appears. However, my main menu is also shutting. I set the defaultCloseOperation to DO NOTHING ON CLOSE as well.

LoginForm

public class LoginForm extends javax.swing.JFrame {

    /**
     * Creates new form LoginForm
     */
    public LoginForm() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        username = new javax.swing.JTextField();
        password = new javax.swing.JTextField();
        jPanel1 = new javax.swing.JPanel();
        Login = new javax.swing.JLabel();
        labelpassword = new javax.swing.JLabel();
        labelusername = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        Login.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        Login.setText("Login");
        Login.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(255, 255, 255)));
        Login.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                LoginMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(Login, javax.swing.GroupLayout.DEFAULT_SIZE, 76, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(Login, javax.swing.GroupLayout.DEFAULT_SIZE, 39, Short.MAX_VALUE)
        );

        labelpassword.setText("Password");

        labelusername.setText("Username");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(143, 143, 143)
                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(81, 81, 81)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                .addComponent(username, javax.swing.GroupLayout.DEFAULT_SIZE, 226, Short.MAX_VALUE)
                                .addComponent(password))
                            .addComponent(labelpassword)
                            .addComponent(labelusername))))
                .addContainerGap(93, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(37, 37, 37)
                .addComponent(labelusername)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(username, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(26, 26, 26)
                .addComponent(labelpassword)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(password, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(32, 32, 32)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(64, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void LoginMouseClicked(java.awt.event.MouseEvent evt) {                                   
   Loading loading = new Loading(this, true);
   loading.setLocationRelativeTo(this);
   loading.setVisible(true);
    }                                  

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new LoginForm().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JLabel Login;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JLabel labelpassword;
    private javax.swing.JLabel labelusername;
    private javax.swing.JTextField password;
    private javax.swing.JTextField username;
    // End of variables declaration                   
}

JDialog as pop-up loading

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import javax.swing.Timer;
                                                                                                           

public class Loading extends javax.swing.JDialog {
  
    public Loading(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
        this.setBackground(new java.awt.Color(0, 0, 0, 0));
Timer timer = new Timer(10000, new ActionListener(){
    public void actionPerformed(ActionEvent evt) {
        dispose();
     // I tried alrealdy to dispose the Login Form but doesn't working hence I will using this
     LoginForm exit = new LoginForm();
     exit.setVisible(true);
     exit.dispatchEvent(new WindowEvent(exit, WindowEvent.WINDOW_CLOSING));
     MainMenu menu = MainMenu();
     menu.setVisible(true);
    
    }
});
timer.setRepeats(false);
timer.start();    
           
        }
    /**
     * 
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        MainPanel = new javax.swing.JPanel();
        PleaseFIll = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setUndecorated(true);

        MainPanel.setBackground(new java.awt.Color(24, 25, 32));
        MainPanel.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        PleaseFIll.setFont(new java.awt.Font("Segoe UI", 0, 14)); // NOI18N
        PleaseFIll.setForeground(new java.awt.Color(255, 255, 255));
        PleaseFIll.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        PleaseFIll.setIcon(new javax.swing.ImageIcon(getClass().getResource("/restaurantorderingandpayment/images/hourglass.gif"))); // NOI18N
        MainPanel.add(PleaseFIll, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 20, 230, 60));

        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/restaurantorderingandpayment/images/loading.gif"))); // NOI18N
        MainPanel.add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 80, 230, 30));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(MainPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 232, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(MainPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Loading.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Loading.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Loading.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Loading.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        //</editor-fold>
        //</editor-fold>
        //</editor-fold>

        /* Create and display the dialog */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                Loading dialog = new Loading(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {
                    @Override
                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
              
           
                   
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JPanel MainPanel;
    private javax.swing.JLabel PleaseFIll;
    private javax.swing.JLabel jLabel2;
    // End of variables declaration                   
}

MainMenu

public class MainMenu extends javax.swing.JFrame {

    /**
     * Creates new form MainMenu
     */
    public MainMenu() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("WELCOME");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(171, 171, 171)
                .addComponent(jLabel1)
                .addContainerGap(172, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(131, 131, 131)
                .addComponent(jLabel1)
                .addContainerGap(154, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MainMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MainMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MainMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MainMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainMenu().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JLabel jLabel1;
    // End of variables declaration                   
}

Answer 1

This...

LoginForm exit = new LoginForm();
exit.dispatchEvent(new WindowEvent(exit, WindowEvent.WINDOW_CLOSING));

makes no sense at all, the instance of LoginForm you've created here has nothing to do with the one which was created eailier, in fact, Loading has no responsibility for managing it, it's beyong it's scope.

A simple solution would be to make use of an "observer pattern", so that when Loading has actually completed, it can inform any intertested parties and they have can take care of what should be done next.

For example...

public class Loading extends javax.swing.JDialog {

    public interface Observer {
        public void loadingDidComplete();
    }

    private Observer observer;

    public Loading(java.awt.Frame parent, Observer observer) {
        super(parent, true);
        this.observer = observer;
        initComponents();
        this.setBackground(new java.awt.Color(0, 0, 0, 0));
        Timer timer = new Timer(10000, new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                observer.loadingDidComplete();
            }
        });
        timer.setRepeats(false);
        timer.start();

    }

And then in your LoginForm you could so something like...

private void LoginMouseClicked(java.awt.event.MouseEvent evt) {
    Loading loading = new Loading(this, new Loading.Observer() {
        @Override
        public void loadingDidComplete() {
            dispose();
            JFrame frame = new MainMenu();
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    });
    loading.setLocationRelativeTo(this);
    loading.setVisible(true);
}

Oh, and you really, really need to look at How to Use Buttons, Check Boxes, and Radio Buttons and How to Write an Action Listener , again, stop using the form editor, it's not doing your any favours

However, oddly enough, since you're using a modal dialog, you could simply do...

private void LoginMouseClicked(java.awt.event.MouseEvent evt) {
    Loading loading = new Loading(this);
    loading.setLocationRelativeTo(this);
    loading.setVisible(true);

    dispose();
    JFrame frame = new MainMenu();
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
}

and get the same effect