Comparable Interface

Objects that have an ordering are compared using the compareTo() method.

6. Rules for compareTo()



Answer:
positive






Rules for compareTo()





    

    

    

        

            

                

            

        

    













    





    
With all objects, compareTo() works the way number comparisons work in ordinary arithmetic. Here are a few rules. Most of these are sensible if you think about numbers. Say that A, B, and C are Integers.
compareNumbers01
If A.compareTo(B) > 0 and B.compareTo(C) > 0 then A.compareTo(C) > 0.
compareNumbers02
If A.compareTo(B) == 0 then A.compareTo(Z) and B.compareTo(Z) gives the same result, no matter what Z is.
compareNumbers03
The classes that come with Java follow these rules. If you write a class that implements Comparable, you need to follow these rules. This is not hard to do because most sensible compareTo() methods will do this naturally.




Question 6:
Say that X.compareTo(Y)==0.
Is it then true that X.equals(Y)?