If a class is using an interface, it must

user2140173 Published at Dev

user2140173

If a class is using an interface, it must:

(1) inherit the properties of the interface

(2) contain the same methods as the interface

(3) create an interface object

(4) all of the above

And the correct answer is (4)all of the above.

Note: this comes from here and I have no idea who actually is the author of the question.

I agree to the (1)st and (2)nd, but I would argue over the wording of the (3)rd.

I guess it could be dually interpreted;

Create an interface object could mean just an instance of a class that inherits an interface

A reference variable of the Interface type

What is the correct way of interpreting the above?

Would the below make sense?

If a class is using an interface, it must:

(1) inherit the properties of the interface

(2) provide implementation for all methods that the interface exposes

(3) ???

(4) all of the above

Jeroen Vannevel

(2) provide implementation for all methods that the interface exposes

No. Abstract classes can implement an interface without providing an implementation (they still have to declare the methods defined in the interface, but they don't have to provide a body).

I wouldn't know how to interpret number 3 either though. When looking trough the link you have provided it's just a matter of badly worded questions. I'm still trying to figure out what this means:

What is the output of the code public class B : A { }
- Errors
- It defines a class that inherits the public methods of A only.
- It defines a class that inherits all the methods of A but the private members cannot be accessed.
- b and c

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