Which of the following statements about interfaces is true?
A)You cannot define a variable whose type is an interface.
B)You can define an interface variable that refers to an object of any class in the same package.
C)You can define an interface variable that refers to an object only if the object belongs to a class that implements the interface.
D)You can instantiate an object from an interface class.

Question

Quizplus · Accepted Answer

An interface is a reference type in Java that is similar to a class, but it is a collection of abstract methods (methods without a body). You cannot instantiate an interface directly, but you can define a variable whose type is an interface. This variable can refer to any object that implements the interface. Therefore, option A is false. Option B is also false because an interface variable can refer to an object of any class that implements the interface, not just in the same package. Option D is false because you cannot instantiate an interface directly. Only option C is true because an interface variable can refer to an object only if the object belongs to a class that implements the interface.

Which of the Following Statements About Interfaces Is True