LinkedHashMap map = new LinkedHashMap(); map.put("user_name", "zs"); map.put("user_age", "23"); map.put("user_class", "256"); list.add(map);

List<LinkedHashMap> linkedHashMap = (List<LinkedHashMap>) list.parallelStream()
        .map(MapUtil::toCamelCaseMap)
        .collect(Collectors.toList());
System.out.println(linkedHashMap);
//[{userName=zs, userAge=23, userClass=256}]