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Monday, October 25, 2010

What are Java Comparators and Comparables?

As both names suggest (and you may have guessed), these are used for comparing objects in Java. Using these concepts; Java objects can be
sorted according to a predefined order.

Two of these concepts can be explained as follows.

Comparable

A comparable object is capable of comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its instances.

Comparator

A comparator object is capable of comparing two different objects. The class is not comparing its instances, but some other class's instances. This comparator class must implement the java.util.Comparator interface

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