Convert an ArrayList into an array

Here is a Java Program to Convert an ArrayList into an array.

import java.util.*;

class ArrayListToArray {
  public static void main(String args[]) {
    // Create an array list
    ArrayList al = new ArrayList();
    
    // Add elements to the array list
    al.add(new Integer(1));
    al.add(new Integer(2));
    al.add(new Integer(3));
    al.add(new Integer(4));

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

    // sum the array
    for(int i=0; i<ia.length; i++)
      sum += ((Integer) ia[i]).intValue();

    System.out.println("Sum is: " + sum);
  }
}

Output of Above Java Program
Contents of al: [1, 2, 3, 4]
Sum is: 10