使 X 关闭按钮在 Java 中打开一个新的 JFrame

Question

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?

Answer 1

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.

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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);

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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.

Answer 2

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.