Suppose objects a and b are from a user-defined class that implements the Comparable interface.What must be true about the return value of a.compareTo(b) for the compareTo method that this class implements?
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 -1 if a comes before b, 0 if they are the same, and 1 if a comes after b.
C)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.
D)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.

Question

Quizplus · Accepted Answer

According to the Java documentation, the compareTo method must return a negative value if the invoking object is less than the argument, zero if they are equal, and a positive value if the invoking object is greater than the argument. Therefore, option C is the correct choice.

Suppose Objects a and B Are from a User-Defined Class