Exiting an Application When a JFrame Is Closed
By default, when the close button on a frame is clicked, the frame
hides itself. This example shows how to exit the application
when the frame is closed:
// Create a frame
JFrame frame = new JFrame();
// Get default close operation
int op = frame.getDefaultCloseOperation(); // HIDE_ON_CLOSE
// Set to exit on close
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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