code: public BoxUser.Info getInfo(String... fields) {
          URL url;
          if (fields.length > 0) {
              String queryString = new QueryStringBuilder().appendParam("fields", fields).toString();
              url = USER_URL_TEMPLATE.buildWithQuery(this.getAPI().getBaseURL(), queryString, this.getID());
          } else {
              url = USER_URL_TEMPLATE.build(this.getAPI().getBaseURL(), this.getID());
          }
          BoxAPIRequest request = new BoxAPIRequest(this.getAPI(), url, "GET");
          BoxJSONResponse response = (BoxJSONResponse) request.send();
          JsonObject jsonObject = JsonObject.readFrom(response.getJSON());
          return new Info(jsonObject);
      }
docs: Gets information about this user.
  @param  fields the optional fields to retrieve.
  @return        info about this user.