e053. implementing a class that can be sorted.txt

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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
        }
    }