comparable & comparator之区别联系：

http://www.digizol.com/2008/07/java-sorting-comparator-vs-comparable.html

 

public interface Comparable<T> {
 public int compareTo(T o); 
}

 

public interface Comparator<T> {
    public int compareTo(T o);
    public boolean equals(Ojbect o);
}

 

 

Collection : Set(HashSet, LinkedHashSet, TreeSet) and List(ArrayList, LinkedList, Vector, Stack)

                 Map(HashMap, LinkedHashMap, TreeMap)

其中的区别与联系详见（介绍得较全面）：

http://lcy0202.iteye.com/blog/1562218