Creating object with reference to Interface

Question

A reference variable can be declared as a class type or an interface type.If the variable is declared as an interface type, it can reference any object of any class that impleme

Answer 1

Compiler doesn't care about run-time. as far as the compiler is concerned, it checks if the reference type has a method called display in your interface type.

methods declared in your sub-class or implementing class are not part of your super class/interface. thus you cannot invoke those methods which are declared in sub-class with super class/interface reference type.