Implementing a Class That Can Be Sorted

In order for a class to be used in a sorted collection such as a SortedTree or for it to be sortable by Collections.sort(), the class must implement Comparable.

public class MyClass implements Comparable {
    public int compareTo(Object o) {
        // If this < o, return a negative value
        // If this = o, return 0
        // If this > o, return a positive value
    }
}