Make the X Close button open a new JFrame in Java-CodePudding

I would like to make it so that when you click the X close button on the top right, a new JFrame will appear and the current one will close.

How would I be able to do it?

CodePudding user response：

The question is, can another JFrame open automatically when one JFrame closes. As noted in comments, two possible common solutions include use of a WindowListener or use of a modal dialog (one example of which is as mentioned by Chance Hoard, a JOptionPane, which again is one solution, but certainly not the only solution).

For a WindowListener to work, you can open the new JFrame in the windowClosed() method, for example:

JFrame frame1 = new JFrame("Frame 1");
frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame1.add(Box.createRigidArea(new Dimension(500, 400)));
frame1.pack();
frame1.setLocationByPlatform(true);
frame1.setVisible(true);

frame1.addWindowListener(new WindowAdapter() {
    @Override
    public void windowClosed(WindowEvent e) {
        JFrame frame2 = new JFrame("Frame 2");
        frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame2.add(Box.createRigidArea(new Dimension(500, 400)));
        frame2.pack();
        frame2.setLocationByPlatform(true);
        frame2.setVisible(true);
    }
});

The key here is to set the default close operation to not be JFrame.EXIT_ON_CLOSE so as not to close down the JVM after the initial JFrame window has closed. In the window listener's windowClosed() method, create and display the 2nd JFrame.

To solve this using a modal dialog, I would create the second window, which could be a JFrame, first, to give the dialog an parent application, but then I would write code to display it after displaying the modal dialog. This way, it only shows up once the dialog is no longer visible:

JFrame frame3 = new JFrame("Frame 3");
frame3.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame3.add(Box.createRigidArea(new Dimension(500, 400)));
frame3.pack();
frame3.setLocationByPlatform(true);
// don't display this JFrame yet

// create the dialog, passing in the JFrame and making the dialog "modal"
JDialog dialog1 = new JDialog(frame3, "Dialog 1", ModalityType.APPLICATION_MODAL);
dialog1.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog1.add(Box.createRigidArea(new Dimension(500, 400)));
dialog1.pack();
dialog1.setLocationRelativeTo(frame3);

// show the dialog first
dialog1.setVisible(true);

// this is called only after the dialog is no longer visible
frame3.setVisible(true);

Having said all this, I still recommend that you read the The Use of Multiple JFrames, Good/Bad Practice? link and I recommend avoiding both of the above "solutions" and instead recommend that one create and display a single main application window, a JFrame, and instead swap GUI views, usually JPanels, by using a CardLayout.

CodePudding user response：

I went out and tried this myself and have some bad news. The method i'm sure you're familiar with setDefaultCloseOperation requires an int as parameter, not a function nor frame. Therefore the only way I can see this action being feasible is if you create a JOptionPane instead, that has built in functions to tell your program what to do if the pane is simply closed. I wish you luck on your adventure.