docs: public static String getClassName(String key) {
      int start = 0;
      if (key.startsWith("@") || key.startsWith("members/")) {
        start = key.lastIndexOf('/') + 1;
      }
      return (key.indexOf('<', start) == -1 && key.indexOf('[', start) == -1)
          ? key.substring(start)
          : null;
    }