code: public Object get(String propName) {
          if (propName.equals("key")) {
              return getKey();
          }
          if (propName.equals("value")) {
              return getValue();
          }
          return null;
      }
docs: Gets the value of the requested property
  
  @param propName
  allowed object is {@link String}
  
  @return
  returned object is {@link Object}