public T next() {
if (position == null) {
position = list.first();
} else {
position = list.next(position);
}
return position.element();
}
public boolean hasNext() {
if (position == null) {
return !list.isEmpty();
} else {
try {
list.next(position);
} catch (RuntimeException e) {
return false;
}
}
return true;
}