Is it possible to implement this interface generically so that it can be passed only one type parameter?

From the nature of your question, I'm guessing that your ClassName doesn't rely on any methods in Identifiable that require TId (otherwise you would need the type.) If that's the case, one common solution in this case is to create a non-generic base interface, with all of the methods that don't require the TId type. Then you have.

No. You need to supply a type parameter for Identifiable; how could you do that without declaring the parameter in the class declaration.

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