Java – decomposes int values into different numbers

I want to divide my int value into numbers For example, if not It's 542. The result should be 5,4,2

I have two options 1) Convert int to string & then I can have separate characters by using getchararray() & then I'll convert them to int values

2) Convert int to string instead of char array, iterate it & to get all the numbers

There are other ways to solve the problem If not, which option will be fast?

Solution

List<Integer> digits(int i) {

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