大家都知道,在java中的集合Map中按键值key排序比较简单,只需引用集合TreeMap即可,可是怎样实现按value值排序呢?下面我们来测试一下:
public class TestHashMap { public static void main(String[] args) { Map<String, Integer> map = new HashMap<String, Integer>(); map.put("zhangsan", 1); map.put("lisi", 2); map.put("wangwu", 0); List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String,Integer>>(map.entrySet()); Collections.sort(list, new Comparator<Map.Entry<String,Integer>>() { public int compare(Map.Entry<String,Integer> o1, Map.Entry<String,Integer> o2) { Integer one = o1.getValue(); Integer two = o2.getValue(); return two.compareTo(one); } }); for(Map.Entry<String,Integer> entry : list) System.out.println(entry.getKey()+":"+entry.getValue()); } }
lisi:2
zhangsan:1
wangwu:0
结果即是以value值从大到小进行排序的!
原文:http://blog.csdn.net/cow__sky/article/details/25795313