Java enum Keyword
enum with constants (unchangeable variables):
You can access
enum constants with the dot syntax:
Definition and Usage
enum keyword declares an enumerated (unchangeable) type.
An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables).
To create an enum, use the
enum keyword (instead of class or interface), and separate the constants with a comma. Note that they should be in uppercase letters.
Difference between Enums and Classes
enum can, just like a
class, have attributes and methods. The only
difference is that enum constants are
(unchangeable - cannot be overridden).
enum cannot be used to create objects, and it can not extend other classes (but it can implement interfaces).
Use enums when you have values that you know aren't going to change, like month days, days, colors, deck of cards, etc.
Read more about enums in our Java Enum Tutorial.