UGC NET CSE | Junet 2015 | Part 3 | Question: 37

Question

In Java, when we implement an interface method, it must be declared as

• A. Private
• B. Protected
• C. Public
• D. Friend

Answer 1

Answer must be C public

because

• An interface is a reference type in Java, it is similar to class, it is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.
• Interfaces are meant to define the public API of a type - and only that, not its implementation.
• An interface is implicitly abstract. You do not need to use the abstract keyword while declaring an interface.
• Each method in an interface is also implicitly abstract, so the abstract keyword is not needed.
• So any method (or static member) you define in an interface is by definition public.