An enumeration is a feature added to J2SE 5. It is very similar to a class, except that it cannot be instantiated. It is declared using the keyword enum. An enumeration can have constructors, methods, and instance variables in the same way as a class. Identifiers of an enum are referred to as enum constants. These constants cannot have any type other than the enum-type itself. An enum constructor can never be invoked directly. They are always called automatically on initialization. An enum can be declared inside, as well as outside a class. When declared outside a class, it should be declared either public or default. It cannot be private, protected, static, abstract, or final. A semicolon in the enum declaration is optional and may be put at the end of enum declaration.
An enum is declared as follows:
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