package tms.route;

public class TrafficLight {
   TrafficSignal signal;

   public TrafficLight(){

       TrafficSignal signal = TrafficSignal.RED;
   }

   public TrafficSignal getSignal(){
      return signal;
   }

   public void setSignal(TrafficSignal signal){

       this.signal = signal;
   }
}

为什么我在别的类中不能用类命打点getSignal()调用这个方法呀