Implementing toString on Java enums

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You can do it as follows:

private enum TrafficLight {
   // using the constructor defined below
   RED("abc"),
   GREEN("def");

   // Member to hold the name
   private String string;

   // constructor to set the string
   TrafficLight(String name){string = name;}

   // the toString just returns the given name
   @Override
   public String toString() {
       return string;
   }
}

You can add as many methods and members as you like. I believe you can even add multiple constructors. All constructors must be private.

An enum in Java is basically a class that has a set number of instances.

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