java - Unable to see the output while recording the key strokes using jnativeHook -

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i'm trying record keystrokes when ever perform key events left,right,move,press,release etc.initially when wrote code , compiled able record key strokes.however,when compiled after little bit of code indentation showing following statement

  process finished exit code 0

below posted code:

public class key_logger implements nativekeylistener {  public void nativekeypressed(nativekeyevent e) {      system.out.println("key pressed: " + nativekeyevent.getkeytext(e.getkeycode()));            if (e.getkeycode() == nativekeyevent.vk_escape)           {                 globalscreen.unregisternativehook();            }    }  public void nativekeyreleased(nativekeyevent e) {      system.out.println("key released: " + nativekeyevent.getkeytext(e.getkeycode()));  }  public void nativekeytyped(nativekeyevent e) {      system.out.println("key typed: " + e.getkeytext(e.getkeycode()));  }  public static void main(string[] args) {      try {          globalscreen.registernativehook();      }      catch (nativehookexception ex) {          system.err.println("there problem registering native hook.");          system.err.println(ex.getmessage());          system.exit(1);     }      //construct example object , initialze native hook.     globalscreen.getinstance().addnativekeylistener(new key_logger()); }   }


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