zvFtqD - Online Java Compiler & Debugging Tool

import java.util.*;

public class Main {

    static ArrayList<Long> divisors(long n) {
        ArrayList<Long> list = new ArrayList<>();
        long limit = (long) Math.sqrt(n);
        for (long i = 1; i <= limit; i++) {
            if (n % i == 0) {
                list.add(i);
                if (n / i != i) list.add(n / i);
            }
        }
        return list;
    }

    public static void main(String[] args) {
        ArrayList<Long> d = divisors(12);
        for (int i = d.size() - 1; i >= 0; i--) {
            System.out.print(d.get(i) + " ");
        }
    }
}