Arraylists and arrays

Question

i'm trying to put the numbers in an arraylist into an int[] array. could anyone tell me how this could be done? i tried the below but i get an error pointing to return divisors.toArray();
import java.util.ArrayList;
import java.util.List;
class FactorsDemo {
    public static void main(String[] args) {
     //for(int i = 10; i < 30; i+=5) {
         int[] divisors = getDivisors(10);
    static int[] getDivisors(int n) {
     List<Integer> divisors = new ArrayList<Integer>();
     for(int d = 1; d <= n/2; d++) {
         if(n%d == 0) divisors.add(new Integer(d));
     return divisors.toArray();
}

Answer 1

i'm trying to get this code to compile without using generics, just to see how it is done. it gets the divisors of a number, puts them into an arraylist, and then returns an array with those same divisors.
i tried to cast the arraylist object to an int, but it's not working.
can anyone show me what i need to do?
import java.util.ArrayList;
import java.util.List;
class FactorsDemo2 {
    public static void main(String[] args) {
     for(int i = 10; i < 50; i+=5) {
         System.out.print("Factors of "+i+": ");
         int[] divisors = getDivisors(i);
         display(divisors);
    static int[] getDivisors(int n) {
     List divisors = new ArrayList();
     for(int d = 1; d <= n/2; d++) {
         if(n%d == 0) divisors.add(new Integer(d));
     int[] myInts = new int[divisors.size()];
        for(int i = 0; i < divisors.size(); i++) {
               myInts[i] = (int) divisors.get(i);
        return myInts;
    static void display(int[] x) {
     for(int i = 0; i < x.length; i++) {
         System.out.print(x[i]+" ");
     System.out.println();
}FactorsDemo2.java:21: inconvertible types
found : java.lang.Object
required: int
myInts[i] = (int) divisors.get(i);
^
Note: FactorsDemo2.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error