code: private void constructPropertiesString(String propertyName, Object property) throws IOException {
          getWriter().write(propertyName + String.valueOf(property) + "\n");
      }
docs: The method to output string containing information about passed property using writer.
  
  @param propertyName the string containing name of a property.
  @param property     a property value.
  @throws IOException appears if the output into writer is impossible.