Many of Java’s core classes implement Comparable. Use TreeMap or TreeSet when sorting a Map or a Set. The compareTo() method works with both Comparable and Comparator.

> Whenever you implement a value class that has a sensible ordering, you should have the class implement the `Comparable` interface so that its instances can be easily sorted, searched, and used in ...

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If you want to take advantage of sorting methods in Java, you'll need to implement the Comparable interface. Written by David Petersheim, Contributor Feb. 17, 2005 at 8:00 a.m. PT.