How do you close a JFrame window without closing another one?

Question

I am new to Java Swing and I am trying to learn how to close one frame without closing the other one using button. For example I have a frame1/window that just have a button called login. Once I click on login button, another window appear frame2. On frame2 I just have a sample JLabel "Hello And Welcome", button called Logout. I want to be able to click on the Logout button on frame2 and frame2 window should close, but frame1 window show still be open. I have try setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE), but it only work if I click on the x icon on the top right of the frame2 window. Does anyone know of a way to close a frame when you click on a button?

public class Frame1 extends JFrame implements ActionListener{
    
    private static JButton login = new JButton("Login"); 
    private static JFrame f = new JFrame("Login");  

    Frame1(){
     
        f.setSize(1000,750);
        f.setLocation(750, 250);

        login.setBounds(250, 350, 150, 30);

        f.add(login);
        f.setLayout(null);    
        f.setVisible(true); 
        login.addActionListener(this);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public void actionPerformed(ActionEvent e){

        if (e.getSource() == login){

            Frame2.frame2windown();
        }
    }

    public static void main(String [] args){

        Frame1 login1 = new Frame1();
    }
}

public class Frame2 extends JFrame implements ActionListener{

    private static JButton logout = new JButton("Logout"); 
    private static JLabel jb1 = new JLabel ("Hello And Welcome");
    private static JFrame f = new JFrame("Log Out");  

    Frame2(){
     

        f.setSize(1000,750);
        f.setLocation(750, 250);

        jb1.setBounds(250, 150, 350, 30);

        logout.setBounds(250, 350, 150, 30);

        f.add(logout);
        f.add(jb1);
        f.setLayout(null);    
        f.setVisible(true); 

        logout.addActionListener(this);

        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

    }

    public void actionPerformed(ActionEvent a){

        if(a.getSource() == logout){

            dispose();
            WindowEvent closeWindow = new WindowEvent(this, JFrame.DISPOSE_ON_CLOSE);
            Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(closeWindow);

        }

    }


    public static void frame2windown(){
        
        Frame2 f2 = new Frame2();

    }
}

Answer 1

You duplicated the JFrame, created a JFrame field f inside the JFrame. Do not use static components like the button.

public class Frame1 extends JFrame implements ActionListener {

    private final JButton login = new JButton("Login");

    Frame1() {
        setTitle("Login");
        setSize(1000, 750);
        setLocation(750, 250);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(null);

        login.setBounds(250, 350, 150, 30);

        add(login);
        login.addActionListener(this);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == login) {
            Frame2.frame2windown();
        }
    }

    public static void main(String[] args) {
       EventQueue.invokeLater(() -> {
          Frame1 login1 = new Frame1();
       }
    }
}

Use the swing/awt event queue (invokeLater) as on this thread window events are handled and dispatched further.

And Frame2:

public class Frame2 extends JFrame implements ActionListener {

    private JButton logout = new JButton("Logout");
    private JLabel jb1 = new JLabel("Hello And Welcome");

    Frame2() {
        setTitle("Logout");
        setSize(1000, 750);
        setLocation(750, 250);
        setLayout(null);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        jb1.setBounds(250, 150, 350, 30);
        logout.setBounds(250, 350, 150, 30);
        add(logout);
        add(jb1);
        logout.addActionListener(this);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent a) {
        if (a.getSource() == logout) {
            setVisible(false); // <--- ALL
        }
    }

    public static void frame2windown() {
        Frame2 f2 = new Frame2();
    }
}

JFrame.setVisible does it all. Especially setVisible(true) should maybe even done after the constructor is called, so it always is last.

Another remark, dive into layout managers fast. Absolute layouts (null) are a PITA.