docs: public static long max(long... numberArray) {
  		if (isEmpty(numberArray)) {
  			throw new IllegalArgumentException("Number array must not empty !");
  		}
  		long max = numberArray[0];
  		for (int i = 0; i < numberArray.length; i++) {
  			if (max < numberArray[i]) {
  				max = numberArray[i];
  			}
  		}
  		return max;
  	}