java - KeyListener wont focus -


i'm new java please forgive me asking help, after 4 hours of searching solution i'm getting desperate.

i'm setting game , want implement key controls. tried via keylistener , keyeventdispatcher can't work. keylistener won't react. think method supposed use has focus.

here's code:

public class sins extends jframe implements keyeventdispatcher  {   public boolean dispatchkeyevent(keyevent e) {      if (e.getid() == keyevent.key_pressed ) {          if(keyevent.vk_up == e.getid()){              system.exit(0);           }       } else if (e.getid() == keyevent.key_released) {            if(keyevent.vk_up == e.getid()){              system.exit(0);             }      } else if (e.getid() == keyevent.key_typed) {            if(keyevent.vk_up == e.getid()){              system.exit(0);             }      }      return false;  }

and here method supposed working at:

  public void run() {     setfocusable(true);      backgroundgraphics = (graphics2d) background.getgraphics();   long fpswait = (long) (1.0 / 30 * 1000);    requestfocusinwindow();  main: while (isrunning==true) {     long renderstart = system.nanotime();      keyboardfocusmanager manager = keyboardfocusmanager.getcurrentkeyboardfocusmanager();     manager.addkeyeventdispatcher(this);      x++;     requestfocusinwindow();      // update graphics     {         graphics2d bg = getbuffer();          if (isrunning == false) {             break main;         }         rendergame(backgroundgraphics); // calls draw method          if (scale != 1) {             bg.drawimage(background, 0, 0, width * scale, height                     * scale, 0, 0, width, height, null);         } else {             bg.drawimage(background, 0, 0, null);         }         bg.dispose();          requestfocusinwindow();           this.requestfocus();          if(x ==5000){             isrunning=false;         }      } while (!updatescreen());      // better fps limiting here     long rendertime = (system.nanotime() - renderstart) / 10000;     try {         thread.sleep(math.max(0, fpswait - rendertime));     } catch (interruptedexception e) {         thread.interrupted();         break;     }       rendertime = (system.nanotime() - renderstart) / 10000;     }     this.dispose();    system.exit(0); }

the program closing after counting 5000. test purposes i'm trying close via button won't close way. appreciate help, said i'm new java.

the first problem facing keylistener know , documented (here on especially). keylistener on respond if component attached focusable , has keyboard focus. think of text field, when doesn't have focus, won't update.

your second problem using keyboardfocusmanager, overkill problem.

instead, should make use of [key bindings] api, simpler having monitor keyboardfocusmanager , more robust keylisteners


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