Can You Write an Interface that Can Not be implemented?

Question

This is related to final interface in java. Among the discussion there was that the concept of final in relation to interfaces is ambiguous. Would a final interface mean t

Answer 1

I submit the following as an interface such that implementation will be prevented at compile-time.

interface FinalInterface
{
    class Types
    {
        private class Alpha { }

        private class Beta { }
    }

    void method ( Types . Alpha param ) ;

    void method ( Types . Beta param ) ;
}