You can add data, methods, and constructors to an enum. : enum « Object Oriented « SCJP

1. SCJP
2. Object Oriented
3. enum

enum Suit {
  DIAMOND(true), HEART(true), CLUB(false), SPADE(false);

  private boolean red;

  Suit(boolean b) {
    red = b;
  }

  public boolean isRed() {
    return red;
  }

  public String toString() {
    String s = name();
    s += red ? ":red" : ":black";
    return s;
  }
}