Java OCA OCP Practice Question 101

Question

Which are true?

Choose all that apply.

  • A. "X extends Y" is correct if and only if X is a class and Y is an interface.
  • B. "X extends Y" is correct if and only if X is an interface and Y is a class.
  • C. "X extends Y" is correct if X and Y are either both classes or both interfaces.
  • D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces. 


C is correct.

Note

A is incorrect because classes implement interfaces, they don't extend them.

B is incorrect because interfaces only "inherit from" other interfaces.

D is incorrect based on the preceding rules.




PreviousNext

Related