code: public void println(double i) {
          if (Logging.core_logger() != null)
              Logging.core_logger().log(level, String.valueOf(i));
      }
docs: Print a double.
  <p>
  This method prints a double data only if the process trace level is greater
  or equal to the object print level. Otherwise, it does nothing
  
  @param i The double to be printed