code: public static void negative(Double value) {
  		if(!validation) return;
  		Validate.notNull(value);
  		if(value >= 0.0)
  			throw new ParameterException(ErrorCode.NOTNEGATIVE);
  	}
docs: Checks if the given double is negative.
  @param value The double value to validate.
  @throws ParameterException if the given double value is <code>null</code> or bigger/equal to 0.