Java OCA OCP Practice Question 2615

Question

Which of the following could be inserted to fill in the blank? (Choose all that apply.) 

public interface Printable { 
   default void print() { } 
} 
class Log implements Printable { 
  _____________________________ 
}
  • A. @Override public boolean equals(Object o) { return false; }
  • B. @Override public boolean equals(Printable o) { return false; }
  • C. @Override public int hashCode() { return 42; }
  • D. @Override public long hashCode() { return 42; }
  • E. @Override public void print() { }
  • F. @Override void print() { }


A, C, E.

Note

Remember that @Override means that we are implementing a method from a superclass or interface.

The Object class declares methods with the signatures in Options A and C.

Granted, it is a poor implementation of equals(), but it does compile.

Option E is also correct because the method is declared in Printable.

Option F is incorrect because methods from an interface are always public.

Option B is incorrect because the parameter type does not match the one in Object.

Option D is incorrect because the return type does not match the one in Object.




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