Map 取相同值的key

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Map 取相同值的key

public static List<Map.Entry<Object, Object>> getKeyBySameValue(Map map){        Map values = new HashMap();        List list;        Iterator iterator = map.keySet().iterator();        while (iterator.hasNext()) {            Object key = iterator.next();            Object value = map.get(key);            if (map.containsValue(value)) {                if (values.containsKey(value)) {                    list = (List) values.get(value);                } else {                    list = new ArrayList();                }                list.add(key);                values.put(value, list);            }        }        iterator = values.keySet().iterator();        Map<Object,Object> newMap =  new HashMap<>();        while (iterator.hasNext()) {            Object value = iterator.next();            List result = (List) values.get(value);            if (result.size() > 1) {                System.out.println("value :" + value + "  -> keys:"                        + result.toString());            }            newMap.put(value,result.toString());        }        List<Map.Entry<Object, Object>> returnList = new ArrayList<>(newMap.entrySet());        return returnList;    }

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