Enum in Java

http://javarevisited.blogspot.com/2011/08/enum-in-java-example-tutorial.html
http://javarevisited.blogspot.com/2011/12/convert-enum-string-java-example.html

An enum example

private enum Score {
    MINUS10(-10),
    MINUS5(-5),
    ZERO(0),
    PLUS5(5),
    PLUS10(10);
    private final int value;

    private Score(int value) {
      this.value = value;
    }

    public int getValue() {
      return value;
    }

    static public boolean isValid(int value) {
      Score[] scores = Score.values();
      for (Score aScore : scores) {
        if (aScore.getValue() == value) {
          return true;
        }
      }
      return false;
    }
  }