Java : What You Should Know about the Comparable and Comparator Interfaces

	Comparable	Comparator
Interface	Implemented by the class being compared	Separate interface
Purpose	Defines natural ordering for the class	Defines custom ordering for objects
Method	compareTo(Object obj): int	compare(T obj1, T obj2): int
Use Case	Sorting objects based on inherent properties	Sorting objects based on custom criteria
Usage	Objects implement Comparable interface	Custom Comparator instances are created
Sorting	Single sorting criterion	Multiple sorting criteria
Control	Class has control over its own ordering	No control over the class being compared
Dependency	Objects must be modified to implement Comparable	Objects can be sorted without modification
Returned int indicates	Negative integer if calling object is less than specified object<br>Zero if they are equal<br>Positive integer if calling object is greater than specified object	Negative integer if obj1 is less than obj2<br>Zero if they are equal<br>Positive integer if obj1 is greater than obj2

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