Java can't get KeyListener to work in my GUI -

i making sort of remote control program lego ev3 robot. part irrelevant. made gui , want control robot when press keys. understand have use called keylistener , saw tutorial supposed work.

the gui class code right here. kinda long has keypressed event @ end.

http://pastebin.com/qk639bds

i not sure doing wrong program doesn't detect if key pressed @ all. any.

i appreciate on how make work.

edit:

keymanager=keyboardfocusmanager.getcurrentkeyboardfocusmanager(); keymanager.addkeyeventdispatcher(new keyeventdispatcher() {         // up:38  down:40  left:37  right:39       public boolean dispatchkeyevent(keyevent e) {         if(e.getid()==keyevent.key_pressed && e.getkeycode()==38){           system.out.println("up");           return true;         }         if(e.getid()==keyevent.key_released&& e.getkeycode()==38){             system.out.println("released");             return true;         }          return false;       }      }); 

so browsed around , found keyboardfocusmanger sort of working me. testing println. having 1 problem. while hold down key want print once. because key start motor , keep moving until key release stop it.

any ideas on how that?

keylistener has issues, particularly focus, when of text fields focused, keylistener won't respond, example.

a better solution make use of key bindings api, allows control level of focus required in order trigger key event. in combination action api, can define common actions both keys , buttons, example.

take @ how use key bindings , how use actions more details.

ps- i'm jealous , wish luck ;)