java - 如何将两个整数的数字相加？

Question

如何使用以下方法在单独的方法中对两个数字的整数求和？我试图自学如何使用重载方法，但这开始让我感到困惑。谢谢!

public static void sumNUmber(){
        System.out.println("Enter a number");
       Scanner in = new Scanner(System.in);
    int num = in.nextInt();
        int sum = 0;
        while (num > 0) {
            sum = sum + num % 10;
            num = num / 10;
        }
        System.out.println(sum);

Answer 1

public static void main(String[] args) throws ClassNotFoundException {

        System.out.println("Enter a number");
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        System.out.println(sumDigits(num));
    }

    public static int sumDigits(int num) {
        int sum = 0;
        while (num > 0) {
            sum += num % 10;
            num = num / 10;
        }
        return sum;
    }

输出

Enter a number
234
9