Map排序

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public class HashMapTest {
    public static void main(String[] args) {
        Map map = new HashMap();
        map.put("c", "ccccc");
        map.put("a", "aaaaa");
        map.put("b", "bbbbb");
        map.put("d", "ddddd");

        List> list = new ArrayList>(map.entrySet());
        Collections.sort(list,new Comparator>() {
            //升序排序
            public int compare(Entry o1,
                    Entry o2) {
                return o1.getValue().compareTo(o2.getValue());
            }

        });

        for(Map.Entry mapping:list){ 
               System.out.println(mapping.getKey()+":"+mapping.getValue()); 
          } 
     }
}