JFrame Exit on close Java

Question

I don't get how can I employ this code:

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

to close the program with the x button.

Answer 1

You need the line

frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 

Because the default behaviour for the JFrame when you press the X button is the equivalent to

frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE); 

So almost all the times you'll need to add that line manually when creating your JFrame

I am currently referring to constants in WindowConstants like WindowConstants.EXIT_ON_CLOSE instead of the same constants declared directly in JFrame as the prior reflect better the intent.

Answer 2

If you don't have it, the JFrame will just be disposed. The frame will close, but the app will continue to run.