Map将key转成小写

转成小写"/>

Map将key转成小写

`将map中的key值进行转化成大写或者小写

 public static void main(String[] args) {HashMap<String, Object> hashMap = new HashMap<>();hashMap.put("W", "12");hashMap.put("C", "12");hashMap.put("T", "12");Map<String, Object> objectMap = keyToLowerCase(hashMap);System.out.println(objectMap);}public static  Map<String, Object> keyToLowerCase(Map<String, Object> orgMap) {Map<String, Object> resultMap = new HashMap<>();if (orgMap == null || orgMap.isEmpty()) {return resultMap;}Set<Map.Entry<String,Object>> entrySet = orgMap.entrySet();for (Map.Entry<String, Object> entry : entrySet) {String key = entry.getKey();Object value = entry.getValue();resultMap.put(key.toLowerCase(), value);//转成小写}return resultMap;}