How to find sum of integers in an ArrayList using iterator class

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

public class SumarrayList {
	
	public static void main(String[] args) {
		
		List<Integer> arrNums = new ArrayList<Integer>();
		int sumNums=0;
		
		//Fill the array list with a few integers
		arrNums.add(42);
		arrNums.add(521);
		arrNums.add(98);
		arrNums.add(61);
		arrNums.add(3);
		arrNums.add(95);
		
		System.out.println( "Using the ListIterator interface traverse through the arrayList");
		ListIterator<Integer> liter = arrNums.listIterator();
		while (liter.hasNext()) 
			sumNums += liter.next();
		System.out.println("The sum of Integers from an arrayList="+sumNums);
		
		sumNums=-0;
		System.out.println("Using Iterator interface traverse through the arrayList");
		Iterator<Integer> iter = arrNums.iterator();
		while (iter.hasNext())
			sumNums += iter.next();
		System.out.println("The sum of Integers from an arrayList="+sumNums);
	}
}