code: public static void isNegative( int argument,
                                     String name ) {
          if (argument >= 0) {
              throw new IllegalArgumentException(CommonI18n.argumentMustBeNegative.text(name, argument));
          }
      }
docs: Check that the argument is negative (<0).
  
  @param argument The argument
  @param name The name of the argument
  @throws IllegalArgumentException If argument is non-negative (>=0)