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Once you have defined a window listener, with an appropriate listener
method, and have connected a window-listener instance to a particular
window, your application's window-displaying frame is ready to handle mouse
clicks on the window-closing button. Whenever there is such a click,
Java activates machinery, defined by the programmers that implemented the
JFrame class, that does the following:
WindowEvent instance
windowClosing method with the connected listener as the
target and the WindowEvent instance as an ordinary argument
Then, the windowClosing method—defined in the instance's
class—does its intended work, shutting down the application by calling the
exit method.