Why should a Java class implement comparable?

Question

Why is Java Comparable used? Why would someone implement Comparable in a class? What is a real life example where you need to implement comparable

Answer 1

The fact that a class implements Comparable means that you can take two objects from that class and compare them. Some classes, like certain collections (sort function in a collection) that keep objects in order rely on them being comparable (in order to sort you need to know which object is the "biggest" and so forth).