Code-Bin #874

untitled Java 5 Code
Posted by: Mark Hayes | October 3, 2010 @ 2:03am

Java 5 Code

/* User clicked on the X close-window button
     * This method is the actionListener for the "windowClosing" event for the
     * JFrame.
     * To Create the ActionListener for the JFrame:
     *   Design view > Inspector panel
     *   Right-click on the JFrame, select Properties
     *   1. Set "defaultCloseOperation" to DO_NOTHING
     *   2. Click on Events. Scroll down to the "windowClosing" event.
     *      Click on the down-arrow button to the right of <none>.
     *      Press the Close button.
     *      The actionListener method will be inserted into your code.
     */
    private void formWindowClosing(java.awt.event.WindowEvent evt) {
         shutdownApplication();
    }

/* Called by the actionListeners for File > Exit, and  the
     * red X close-window button.
     */
    private void shutdownApplication() {

// Ask user if they really want to exit
        int choice = JOptionPane.showConfirmDialog(this,
                "Are you sure you want to exit?", "Confirm Exit",
                JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
        // Check user response
        if (choice == JOptionPane.OK_OPTION) {
            System.exit(0);
        }
    }

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Author Comments

Shows an example of how to respond the close window button (red X) in the upper-right corner of the JFrame.

Note, in addition to adding an ActionListener, you should also set the defaultCloseOperation to DO_NOTHING. (default == CLOSE_ON_EXIT).

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