code: @Override
      public Object getMember(String name) {
          switch (name) {
              case "toJSON":
                  return F_toJSON;
              case "toString":
                  return F_toString;
              case "valueOf":
                  return F_valueOf;
              case "getJavaObject":
                  return F_getJavaObject;
          }
          return null;
  //        throw new RuntimeException(getClassName() + "." + name + " is not defined");
      }
docs: get the value of that named property