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Under what circumstances is an enum more appropriate than, for example, a Collection that guarantees unique elements (an implementer of java.util.Set, I guess…)?
(This is kind of a follow up from my previous question)
Basically when it’s a well-defined, fixed set of values which are known at compile-time.
You can use an enum as a set very easily (with EnumSet) and it allows you to define behaviour, reference the elements by name, switch on them etc.