code: private void convertMap(Map<?, ?> obj) {
          for(Object key : obj.keySet()){
              paths.addLast(key.toString());
              DLR(fetchPath(), obj.get(key));
              each(obj.get(key));
              LRD(fetchPath(), obj.get(key));
              paths.removeLast();
          }
      }
docs: 转换map
  @param obj