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Might want to check which component has the focus, and make sure that the component you want to monitor for key presses requests it. Again, CardLayout is still probably how you should be proceeding....

Yeah, the API is your best friend. The method you're looking for is validate or revalidate. Alternatively, you could look into CardLayout.

Let me see if I can help, you have a few issues here...

First off, that scan.nextLine() is acting like the scanf function you described- it stops and waits for input before it continues executing...