code: private void addChild(String path, String[] value) {
          String subname = fetchName(path);
          ObjectNaviNode onn = child.get(subname);
          if (onn == null) {
              onn = new ObjectNaviNode();
          }
          onn.putPath(path, value);
          child.put(subname, onn);
      }
docs: 添加子结点