Map コレクションのキーの大文字と小文字を変換するにはどうすればよいですか?

ツール:

ToUpperCaseKeyMapUtil.java

public class ToUpperCaseKeyMapUtil {

    //对单一的map
    public static <T> Map<String, T> toUpperCaseKeyMap(Map<String, T> map) {
        if (map != null) {
            List<String> mapKeyList = new ArrayList<>(map.keySet());
            mapKeyList.forEach(key->{
                map.put(key.toUpperCase(),map.remove(key));//字段名转大写
            });
        }
        return map;
    }

    //对不唯一的map集合进行转换
    public static <T> List<Map<String, T>> toUpperCaseKeyMapList(List<Map<String, T>> mapList) {
        if (mapList != null && mapList.size() > 0) {
            mapList.forEach(ToUpperCaseKeyMapUtil::toUpperCaseKeyMap);
        }
        return mapList;
    }


  /**
     * key转小写
     *
     * @param orgMap
     * @return
     */
    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);
        }

        return resultMap;
    }

}

使用：

   public static void main(String[] args) {
        HashMap<String, Object> map = new HashMap<>();
        map.put("ksd","999");
        map.put("ads","999");
        HashMap<String, Object> map1 = new HashMap<>();
        map1.put("ew","23123");
        Map<String, Object> upperCaseKeyMap = toUpperCaseKeyMap(map);
        Set<String> strings = upperCaseKeyMap.keySet();
        System.out.println(strings);
        System.out.println("===========================================");
        List<Map<String,Object>> list = new ArrayList<>();
        list.add(map);
        list.add(map1);
        List<Map<String, Object>> mapList = toUpperCaseKeyMapList(list);
        mapList.stream().forEach(stringObjectMap -> System.out.println(stringObjectMap));
    }