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Java Enum in 10 Minutes

This tutorial aims at teaching Java enums to newbies in 10 mins. To meet this goal I will keep my descriptions short and concise. References will be provided at the end of the tutorial for detailed study.
Concept 1 : Enums are introduced in Java 1.5 and are used to define constants.
Scenario 1: Defining Constants
public enum WeekDay{
    MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY,
    SUNDAY;
}