[Java] HashMap Comparator 람다식 정렬

 

Map<String, Integer> map = new HashMap<>();
map.put("a", 3);
map.put("b", 2);
map.put("c", 1);
List<Map.Entry<String, Integer>> entryList = new LinkedList<>(map.entrySet());
entryList.sort(((o1, o2) -> map.get(o1.getKey()) - map.get(o2.getKey())));
for(Map.Entry<String, Integer> entry : entryList){
    System.out.println("key : " + entry.getKey() + ", value : " + entry.getValue());
}

//key : c, value : 1
//key : b, value : 2
//key : a, value : 3