Test Program
class TestClosedList
{
public static void main(String arg[])
  {
  int numItems = 10;
  ClosedList L = new ClosedList();

  for( int i = 0; i < numItems; i++ )
    {
    L.enqueue(new Integer(i));
    }

  ClosedList.Iterator it = L.getIterator();

  System.out.println("removing " + it.next());
  it.remove();  // remove first item
}