Implement a class that simulates a traffic light. The next function advances the color in the usual way, from green to yellow to red, then again to green. Provide two constructors, of the public interface. Also supply a member function that yields the number of times that this traffic light has been red.

Explanation:

The following is written in Java. It creates the trafficLight class which holds the currentLight string variable and a int count variable for the number of times the light has been red. It also contains two constructors one that takes the currentLight as a parameter and one that does not. Finally, it has the next() method which analyzes the currentLight status and changes it to the next light. Output can be seen in the attached picture below.

class

{

   public static void main(String[] args)

   {

       trafficLight traffic_light = new trafficLight();

       System.out.println("Current Light: " + traffic_light.currentLight);

       traffic_light.next();

       System.out.println("Current Light after change: " + traffic_light.currentLight);

   }

}

class trafficLight {

   String currentLight;

   int count = 0;

   public trafficLight(String currentLight) {

       this.currentLight = currentLight;

   }

   public trafficLight() {

       this.currentLight = "red";

       count++;

   }

   public void next() {

       if (this.currentLight == "green") {

           this.currentLight = "yellow";

       } else if (this.currentLight == "yellow") {

           this.currentLight = "red";

           count++;

       } else {

           this.currentLight = "green";

       }

   }

}

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