1、聲明一個hashmap對象
Map<Integer, Integer> map = new HashMap<Integer, Integer>();
2、put數據
3、通過ArrayList構造函數把map.entrySet()轉換成list
List<Map.Entry<Integer, Integer>> mappingList = new ArrayList<Map.Entry<Integer, Integer>>(map.entrySet());
4、通過比較器進行比較排序
Collections.sort(mappingList, new Comparator<Map.Entry<Integer, Integer>>(){ public int compare(Map.Entry<Integer, Integer> mapping1, Map.Entry<Integer, Integer> mapping2){ return mapping1.getValue().compareTo(mapping2.getValue()); } });
5、查看
for(Map.Entry<String,String> mapping:mappingList){
System.out.println(mapping.getKey()+":"+mapping.getValue());
}