Enumeration

Enumeration is just like a class but it is used for defining constants.
It Behaves just like a class only we can declare constant objects in it

1. enum EventType{
2. Arrive (1),
3. SERVE(2),
4. Wait(3), //this is calling the constuctor
5. Leave(4),
6. DONE(5)
7. private int type;
8. EventType(int type){
9. this.type = type;
10. }
11. }

Each constant of an enum type is an instance of enum class and is a field declared with public static final
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