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How to prevent to close Java swing Application, when user clicks on close button?
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To disable the close operation on a JFrame , when user click the close icon on the JFrame , we can set the value of the default close operation to WindowConstants. DO_NOTHING_ON_CLOSE .
In Java, we can use TimeUnit. SECONDS. sleep() or Thread. sleep() to pause a program for a few seconds.
We can close the AWT Window or Frame by calling dispose() or System. exit() inside windowClosing() method.
Hint: Oracle has developed JavaFX to replace both Swing and AWT. Since Java SE 7, update 6 it is bundled with Java SE. "JavaFX is a set of graphics and media packages that enables developers to (...) deploy rich client applications that operate consistently across diverse platforms" [1].
frame.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE); on your main frame should prevent that.
The setDefaultCloseOperation(int) method allows you to choose what to do when the user closes the JFrame:
DO_NOTHING_ON_CLOSE (defined in WindowConstants): Don't do anything; require the program to handle the operation in the windowClosing method of a registered WindowListener object.
HIDE_ON_CLOSE (defined in WindowConstants): Automatically hide the frame after invoking any registered WindowListener objects.
DISPOSE_ON_CLOSE (defined in WindowConstants): Automatically hide and dispose the frame after invoking any registered WindowListener objects.
EXIT_ON_CLOSE (defined in JFrame): Exit the application using the System exit method. Use this only in applications.
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JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(new WindowAdapter() {
// handle window closing
});
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