public void handleRequest(PlanetEnum request) {
       if(request == PlanetEnum.EARTH) {
       System.out.println("EarthHandler handles " + request);
       System.out.println("Earth i s comfortable .\n");
       }
        else {
        System.out.println ("EarthHandler doesn t handle " + request);
        if(successor != null) {
         successor.handleRequest(request);
       }
    } 
  }