FizzBuzz4Spaces

FizzBuzzComplex.java

class FizzBuzz {
    public static void main(String[] args) {
        if (args != null && args.length == 1) {
            try {
                int number = Integer.parseInt(args[0]);
                for (int i = 1; i < number; i++) {
                    if (i % 3 == 0 && i % 5 == 0) {
                        System.out.println("FizzBuzz");
                    } else if (i % 3 == 0) {
                        System.out.println("Fizz");
                    } else if (i % 5 == 0) {
                        System.out.println("Buzz");
                    } else {
                        System.out.println(i);
                    }
                }
            } catch (NumberFormatException e) {
                throw new IllegalArgumentException("please pass in a number", e);
            }
        } else {
            throw new IllegalArgumentException("please pass in a number");
        }
    }
}

FizzBuzzLessComplex.java

class FizzBuzz {
    public static void main(String[] args) {
        if (args == null || args.length != 1) {
            throw new IllegalArgumentException("please pass in a number");
        }

        int number = parse(args[0]);
        for (int i = 1; i < number; i++) {
            System.out.println(numberToFizzBuzz(i));
        }
    }

    private static int parse(String number) {
        try {
            return Integer.parseInt(number);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("please pass in a number", e);
        }
    }

    private static String numberToFizzBuzz(int i) {
        if (i % (3 * 5) == 0) {
            return "FizzBuzz";
        } else if (i % 3 == 0) {
            return "Fizz";
        } else if (i % 5) {
            return "Buzz";
        } else {
            return String.valueOf(i);
        }
    }
}