Convert an ArrayList into an array in Java

/*from   w  ww . j a v a 2  s. co m*/
import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    ArrayList<Integer> al = new ArrayList<Integer>();
    al.add(new Integer(1));
    al.add(new Integer(2));
    al.add(new Integer(3));
    al.add(new Integer(4));
    al.add(new Integer(5));

    System.out.println("contents of al : " + al);
    Object ia[] = al.toArray(); // get array
    int sum = 0;

    for (int i = 0; i < ia.length; i++){
      sum += ((Integer) ia[i]).intValue();
    }
    System.out.println("Sum is :" + sum);
  }
}