Exception in thread "main" java.lang.IllegalStateException during Iterator.remove()

I was writing a sample program to demonstate how to remove elments from list while iterating over it by using Iterator.remove() mehtod. Unfortunately I was getting following error, right at the place where I was calling the Iterator.remove() method :

Exception in thread "main" java.lang.IllegalStateException
 at java.util.ArrayList$Itr.remove(Unknown Source)
 at dto.IteratorRemoveTest.main(IteratorRemoveTest.java:25)

I was puzzled, why I am getting this error because I was using Iterator's remove() method and not the ArrayList's remove() method, which causes ConcurrentModificationException in Java.



java.lang.IllegalStateException during Iterator.remove()
Here is my code, Can you spot what is wrong, without looking at the solution

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

/**
 * Java Program to demonstrate how to remove elements from List while
 * traversing over it using Iterator.
 * 
 * @author WINDOWS 8
 */
public class IteratorRemoveTest {

    public static void main(String args[]) {

        List<String> brands = new ArrayList(
                                Arrays.asList("Apple", "Microsoft, Google"));     
        
        System.out.println("Java Program to remove elements from list via Iteator");
        System.out.println("List before removing elements: " + brands);
        
        for (final Iterator<String> itr = brands.iterator(); itr.hasNext();) {
            itr.remove();
        }
        
        System.out.println("List after removing elements: " + brands);
    }

}

Output:
Java Program to remove elements from list using Iteator
List before removing elements: [Apple, Microsoft, Google]
Exception in thread "main" java.lang.IllegalStateException
    at java.util.ArrayList$Itr.remove(ArrayList.java:849)
    at IteratorRemoveTest.main(IteratorRemoveTest.java:25)
Java Result: 1

for (final Iterator<String> itr = brands.iterator(); itr.hasNext();) {
     itr.next();
     itr.remove(); 

Java Program to remove elements from list using Iteator
List before removing elements: [Apple, Microsoft, Google]
List after removing elements: []