public class TrafficLight {
    public static final byte    RED = 1;
    public static final byte    YELLOW = 2;
    public static final byte    GREEN = 3;
    
    public int state;  // The current state of the traffic light
    public int timeRemaining; // Seconds remaining in this state
    
    public TrafficLight(byte  iState) {
        state = iState;
        timeRemaining = 0;
    }
    
    public String toString() {
        switch(state) {
            case RED: return "RED traffic light";
            case YELLOW: return "YELLOW traffic light";
            case GREEN: return "GREEN traffic light";
            default: return "OFF traffic light";
        }
    }
}