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Should I always annotate a class which has only protected constructors by design with abstract keyword? Why?
Let’s suppose the class does not have abstract members.
If no, could you give some examples?
No. A type with only protected constructors is still creatable – either through a static factory method on the type, or via reflection (including, as one option, totally skipping the constructors).
An abstract type is never creatable.
Mark the type as abstract: if it is abstract. So: does it make sense for an object of that type (rather than a subclass) to exist?