List<Map<Object,Object>> mapList = new ArrayList<Map<Object,Object>>();

    Map<Object,Object> map = new HashMap<Object,Object>();

    map.put("C","111");

    map.put("NAME","LB");

    Map<Object,Object> map1 = new HashMap<Object,Object>();

    map1.put("C","111");

    map1.put("NAME","LA");

    Map<Object,Object> map2 = new HashMap<Object,Object>();

    map2.put("C","112");

    map2.put("NAME","LC");

    Map<Object,Object> map3 = new HashMap<Object,Object>();

    map3.put("C","112");

    map3.put("NAME","Lh");

    Map<Object,Object> map4 = new HashMap<Object,Object>();

    map4.put("C","113");

    map4.put("NAME","LC");

    Map<Object,Object> map5 = new HashMap<Object,Object>();

    map5.put("C","114");

    map5.put("NAME","LF");

    mapList.add(map);

    mapList.add(map1);

    mapList.add(map2);

    mapList.add(map3);

    mapList.add(map4);

    mapList.add(map5);

    Map<Integer, List<Map<Object,Object>>> mapMap = new HashMap<>();

    for (Map<Object,Object> newMap : mapList){

        List<Map<Object, Object>>  newl = new ArrayList<>();

        // map是否包含此key，若已经包含则添加一个新的数字到对应value集合中

        if (mapMap.containsKey(Integer.valueOf(newMap.get("C").toString()))){

            //mapList.add(Integer.valueOf(newMap.get("C").toString()),newMap);

            mapMap.get(Integer.valueOf(newMap.get("C").toString())).add(newMap);

        }else{

            newl.add(newMap);

            mapMap.put(Integer.valueOf(newMap.get("C").toString()), newl);

        }

    }

    System.out.println(mapMap);

}