코드를 이렇게 작성하면 문제가 될까요?

public class GetMinimumDistance {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.next();
        char ch = in.next().charAt(0);
        System.out.println(getMinimumDistance(str, ch));
        return;
    }

    public static String getMinimumDistance(String str, char ch) {
        List<Integer> distanceList = new ArrayList<Integer>();
        for(int i = 0; i < str.length(); i++) {
            String beforeStr = str.substring(0, i);
            StringBuilder sb = new StringBuilder(beforeStr);
            beforeStr = sb.reverse().toString();

            String afterStr = str.substring(i);

            int beforeDistance =  beforeStr.indexOf(ch) + 1;
            int afterDistance = afterStr.indexOf(ch);

            if(beforeStr.length() == 0 || beforeDistance == 0) beforeDistance = Integer.MAX_VALUE;
            if(afterStr.length() == 0 || afterDistance == -1) afterDistance = Integer.MAX_VALUE;

            distanceList.add(beforeDistance < afterDistance ? beforeDistance : afterDistance);
        }
        String answer = "";
        for (int dis : distanceList) {
            answer += Integer.toString(dis) + " ";
        }

        return answer.substring(0, answer.length() - 1);
    }
}

혹시 이렇게 작성하면 답은 맞는데 고쳐야 할 부분이라든가 있을까 고수님들 확인 부탁드립니다 ㅠㅠ

너무 비효율적으로 짠거 같아서요 ㅠㅠ