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Comparable vs Comparator

Vivek R.

20/11/2017 1 0 View Comments

java.lang.Comparable

java.util.Comparator

For comparing some other object with its own object. Ex. I am comparing myself to some other employee.
Method signature is:
int compareTo (T object).
For implementing Comparable, access to the original class is required.
The class itself needs to implement Comparable and hence it is inside java.lang package.
It can be used to provide single way of sorting.

For comparing two objects by a separate class. Ex. Manager is comparing two employees with each other.
Method signature is:
int compare (T object1, T object2).
If the required class is not accessible i.e., present inside some jar, then a Comparator implementation can be used that just accepts the two objects and do the comparison.
It is a utility that can be used by an external class to perform the required action and hence it is inside java.util package.
It can be used to provide multiple sorting ways like NameComparator, SalaryComparator etc.

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