// @author Frank M. Carrano, Timothy M. Henry
// @version 5.0
public T next()
{
   checkIntegrity();
   if (hasNext())
   {
      wasNextCalled = true;
      T nextEntry = list[nextIndex];
      nextIndex++; // Advance iterator
      return nextEntry;
   }
   else
      throw new NoSuchElementException("Illegal call to next(); " +
                                       "iterator is after end of list.");
} // end next