What must be true about the return value from the implementation of the compare method for the Comparator interface when comparing two objects, a and b with a call to compare(a, b)?
A)It must return 1 if a comes before b, 0 if they are the same, and -1 if a comes after b.
B)It must return a negative value if a comes before b, 0 if they are the same, and a positive value if a comes after b.
C)It must return a positive value if a comes before b, 0 if they are the same, and a negative value if a comes after b.
D)It must return -1 if a comes before b, 0 if they are the same, and 1 if a comes after b.

Question

Quizplus · Accepted Answer

According to the documentation of the Comparator interface, the compare method must return a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second. Therefore, option B is the correct choice.

What Must Be True About the Return Value from the Implementation