How to close a JFrame application?
Closing a JFrame application can be done by setting the default close operation of the frame. There are some defined constant for the default operation. These constant includes EXIT_ON_CLOSE, HIDE_ON_CLOSE, DO_NOTHING_ON_CLOSE and DISPOSE_ON_CLOSE.
To exit an aplication we can set it to EXIT_ON_CLOSE, this option will call the System.exit() method when user initiate a close operation on the frame.