split int value into separate digits

Question

I want to split my int value into digits. eg if the no. is 542, the result should be 5,4,2.

I have 2 options. 1) Convert int into String & then by using getCharArray(), i can have separate characters & then i will convert them back into int values.

2) Convert int into String, without converting it into char array, iterate it & get all digits.

Is there any other way to solve the problem. If not, which of the option will be fast?

Answer 1

List<Integer> digits(int i) {
    List<Integer> digits = new ArrayList<Integer>();
    while(i > 0) {
        digits.add(i % 10);
        i /= 10;
    }
    return digits;
}

Answer 2

Use the mod 10 rule...

 List<Integer> digits = new ArrayList<Integer>();
 while (n > 0) {
     digits.add(n%10);
     n/=10;
 }