When to use Enum or Collection in Java -

In which situation an anonymous one is more appropriate, for example, a collection that guarantees unique elements (java.util An implementation of (I think ...)?

(This is a follow up from my previous)

Actually, when it's a well-defined, set set of values ​​that are known at compile-time.

You set up as a unit very easily (A) in the form of Can yoga and it allows terms to define the practices, the names of elements, switch on etc.