Is it possible to apply inheritance to a Singleton class?

Question

Today I faced one question in interview. Is it possible to apply inheritance concept on Singleton Classes? I said since the constructor is private, we cannot extend that Singlet

Answer 1

I'm guessing this isn't what he wasn't looking for, but if you want to get technical you could also mention that Singleton is a pattern, not an implementation. Messing with the class constructor isn't the only way to have a Singleton, you could have a factory enforcing the pattern, in which case you can use inheritance in exactly the same way as with other classes.