Java Key Gen (Java) Can Action Listener Detect Key Presses, And If So How?

(Java) Can Action Listener detect key presses, and if so how? - java key gen

Well, I think I have no problems, have a button on the screen, but that's not what I want. Java How to recognize a key was pressed? Please, if possible, please give me an example code, a key that does not use a key.