[프로그래머스/Java] 숫자 찾기

-Code

import java.util.Arrays;
import java.util.stream.Collectors;

class Solution {
    public int solution(int num, int k) {
        int answer =  Arrays.stream(String.valueOf(num)
                        .split(""))
                        .collect(Collectors.toList())
                        .indexOf(String.valueOf(k));
        return answer == -1 ? -1 : answer + 1;
    }
}