A Practical Example of Enum in Java

Enum is a useful feature of Java and the best way to represent fixed number of things e.g. a number of the planet in the solar system, the number of state order can be or simply a number of days in a week. Java Enum is different than their predecessor on other languages like C and C++, where the enum is just a wrapper around integer constant. Enum in Java is a full blown type like class and interface, they can have constructor (though only private constructors are permitted for Enum), they can override methods, they can have member variables, they can even declare methods, can implement interfaces and have specialized high performance Map and Set implementation in form of EnumMap and EnumSet.

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