compare : Java Glossary

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compare
To be able to sort Objects in order, you must be able to compare them. There are two interfaces: java.lang.Comparable and java.util.Comparator. You need to implement one or both of them to use the various ordered collections and sorts. java.lang.Comparable is used to define the natural sort order of a class. java.util.Comparator is used to define a special sort order for a class.

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