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What is Java's Comparable interface, when should you implement this interface, and what are the benefits of Comparable objects?

The Comparable interface imposes the natural ordering of instances of a class implementing it. The interface defines a single method, compareTo, that returns an integer. For example, if you call obj1.compareTo(obj2), the method should return zero if obj1 equals obj2, a negative value if obj1 is less than obj2, or a positive value if obj1 is greater than obj2.

You should consider implementing the Comparable interface in your class if there is a notion of natural ordering in your class instances.

Some benefits of Comparable objects are that they can be sorted in a collection and that they can be stored in a data structure that requires order, such as TreeMap and TreeSet.

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