Multiple choice technology programming languages

Which is true? (Choose all that apply. )

  1. X extends Y is correct if and only if X is a class and Y is an interface.

  2. X extends Y is correct if and only if X is an interface and Y is a class.

  3. X extends Y is correct if X and Y are either both classes or both interfaces.

  4. X extends Y is correct for all combinations of X and Y being classes and/or interfaces.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In Java, the extends keyword is used for inheritance between the same kinds of types: a class can extend another class, and an interface can extend another interface. A class implements an interface using the implements keyword.

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