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I have two classes A and B, where B is subclass of A and A is not abstract. Therefore I can have objects that are instance of A and objects that are instance of B (and therefore of A).
How can I distinguish objects that are only instance of A?
Sure, I can write something like “object instaceof A && !(object instance of B)” but this is a very poor design since I’ll need to change the code every time I add new subclasses to A. Better alternatives?
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