Java Key Generator How Do You Get Input From The Key Board After Clicking On A JButton In Java?

How do you get input from the key board after clicking on a JButton in java? - java key generator

I'm writing a program in Java and I have to start a JButton the game, then use the keyboard to control every time you is not enabled on the button but the keyboard for some reason and I can not use the Enter key. works well when I have the key though. Suggestions would be great, thx!