code: public boolean isSet(String propName) {
          if (propName.equals("method")) {
              return isSetMethod();
          }
          if (propName.equals("object")) {
              return isSetObject();
          }
          if (propName.equals("attribute")) {
              return isSetAttribute();
          }
          return false;
      }
docs: Returns true if the requested property is set; false, otherwise.
  
  @return
  returned object is {@link boolean }