Breaking down an integer

[Emily]

I am working on a project that involves a user entering a 9 digit number to be verified. To verify the number, all the digits have to be added together. At first I thought to use an array. But then it wouldn't be possibe to add the numbers if they all are in one cell. Is there a way to break the int down to single digits that can be added together?

[hardwired]

public class Test {
    public static void main(String[] args) {
        int[] n = { 111111111, 111000000, 123454321 };
        for(int j =0; j < n.length; j++)
            System.out.println(n[j] + " total = " + addDigits(n[j]));
    }

    private static int addDigits(int n) {
        char[] chars = String.valueOf(n).toCharArray();
        int total = 0;
        for(int j = 0; j < chars.length; j++)
            total += Integer.parseInt(String.valueOf(chars[j]));
        return total;
    }
}