Writing this program for class that has to output

The following should print a y x b c:
[a y x b c] <- this is what mine prints with error line commented out
---------------------------------------
The following should print Dan Emily Bill Tom Brett Ashley:
[Dan Emily Bill Tom Brett Chris Ashley] <- and here
---------------------------------------
The following should print a b c d e:
[c a b e d] < -- and here


The error message received:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Type mismatch: cannot convert from Iterator<java.lang.String> to java.util.Iterator<java.lang.String>

at TestDoublyLinkedList.main(TestDoublyLinkedList.jav a:33)



My code: 
import java.util.Iterator ;
 
public class TestDoublyLinkedList {
 
  public static void main(String[] args) {
    DoublyLinkedList<String> L ;
    Iterator<String> I ;
 
    System.out.println("---------------------------------------") ;
    L = new DoublyLinkedList<String>() ;
    L.add("a") ;
    L.add("b") ;
    L.add("c") ;
    L.add(1,"x") ;
    L.add(1,"y") ;
    L.add(1,"z") ;
    L.remove(1) ;
    System.out.println("The following should print a y x b c:") ;
    System.out.println( L ) ;
 
    System.out.println("---------------------------------------") ;
    L = new DoublyLinkedList<String>() ;
    L.add("Dan") ;
    L.add("Emily") ;
    L.add("Bill") ;
    L.add("Tom") ;
    L.add("Brett") ;
    L.add("Chris") ;
    L.add("Ashley") ;
 
 
 // THESE TWO LINES ARE GIVING ME THE ERROR... WELL THE FIRST ONE
 
    //I = L.getIterator() ;
    //while ( I.hasNext() ) { if ( I.next().equals("Chris") ) I.remove() ; }
 
 
 
    System.out.println("The following should print Dan Emily Bill Tom Brett Ashley:") ;
    System.out.println( L ) ;
 
    System.out.println("---------------------------------------") ;
    L = new DoublyLinkedList<String>() ;
    L.add("c") ;
    L.add("a") ;
    L.add("b") ;
    L.add("e") ;
    L.add("d") ;
   // L.sort() ;
    System.out.println("The following should print a b c d e:") ;
    System.out.println( L ) ;
  }
 
}
 
/// End-of-File


Other class of program
import java.util.NoSuchElementException;
 
public class DoublyLinkedList<T>
{
 
 
private class Node
{
private T data;
private Node next;
private Node previous;
 
public Node(T data,Node next, Node previous)
{
this.data = data;
this.next = next;
this.previous=previous;
}
 
// all unnecessary methods i didn't include because they have no importance..
 
 
private T removeItem(Node item) {
	System.out.println("removing" + item.data);
	item.next.previous = item.previous;
	item.previous.next = item.next;
	size--;
	return item.data;
}
 
public boolean remove(T element) {
	Node item = find(element);
	if (item == null)
		return false;
	else {
		removeItem(item);
		return true;
	}
}
 
private Node find(T element) {
	Node ptr = head.next;
	while (ptr != tail) {
		if (element.equals(ptr.data))
			return ptr;
		ptr = ptr.next;
	}
	return null;
}
 
// start ITerator class 
 
public Iterator<T> getIterator() {
	return new DoublyLinkedListIterator();
}
 
class DoublyLinkedListIterator implements Iterator<T> {
	Node location = head;
	boolean returnedElement = false;
 
	public boolean hasNext() {
		return location.next != tail;
	}
 
	public T next() {
		if (location.next == tail)
			throw new NoSuchElementException();
		location = location.next;
		T element = location.data;
		returnedElement = true;
		return element;
	}
 
	public void remove() {
		if (returnedElement == false)
			throw new NoSuchElementException();
		removeItem(location);
		returnedElement = false;
	}	
}
 
 
 
 
 
}