When should you create an enum?

Enums are lists of constants. When you need a predefined list of values which do represent some kind of numeric or textual data , you should use an enum. You should always use enums when a variable (especially a method parameter) can only take one out of a small set of possible values.

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How do you value an enum?

You cannot create an object of an enum explicitly so, you need to add a parameterized constructor to initialize the value(s) . The initialization should be done only once. Therefore, the constructor must be declared private or default. To returns the values of the constants using an instance method(getter).

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