BoBoMEe

  //Emum type with constant-specific method implementations
  public enum Operation1 {
    PLUS {
      @Override double apply(double x, double y) {
        return x + y;
      }
    },
    MINUS {
      @Override double apply(double x, double y) {

BoBoMEe

  //Emum type that switchs on its own value -- questionable
  public enum Operation {
    PLUS, MINUS, TIMES, DIVIDS;

    //Do the arithmetic op represented by this constant
    double apply(double x, double y) {
      switch (this) {
        case PLUS:
          return x + y;
        case MINUS: