Array Search

package MapsLambdaStreamExercise;

import java.util.*;
import java.util.stream.Collectors;

public class test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        List<Integer> inputList = Arrays.stream(scanner.nextLine().split(","))
                .map(Integer::parseInt).collect(Collectors.toList());
        int num = inputList.size();
        List<Integer> resultList = new ArrayList<>();

        for (int i = 1; i <= num ; i++) {
            boolean isExist = false;
            for (int j = 0; j < inputList.size(); j++) {
                int currentNum = inputList.get(j);
                if (currentNum == i) {
                    isExist = true;
                    break;
                }
            }
            if (!isExist) {
                resultList.add(i);
            }
        }
        for (int i = 0; i < resultList.size(); i++) {
            if (i == resultList.size() - 1) {
                System.out.println(resultList.get(i));
            } else {
                System.out.print(resultList.get(i) + ",");
            }
        }
    }
}