// http://stackoverflow.com/a/11026642/348975
 
class Main {
     public static void main ( String [ ] args ) {
          Light light = new Light ( ) ;
          light . Switch(Light.LightSwitch.On) ;
     }
     static class Light {
          private LightSwitch position;
          private enum LightSwitch {
              On,
              Off
          }
          public void SwitchOn() {
              Switch(LightSwitch.On);
          }
          public void SwitchOff() {
              Switch(LightSwitch.Off);
          }
          public void Switch(LightSwitch pos) {
              position = pos;
          }
    }
}

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