public void removeCurrent() throws IllegalStateException
    {
        // check
        if (isCurrent() == false)
        {
            throw new IllegalStateException("No current");
        }
        else if (current == head)
        {
            previous = null;
            head.setLink(null);
            current = current.getLink();
            current = head;
        }
        else if (current != tail && current != head)
        {
            previous.setLink(current.getLink());
            current = previous.getLink();
        }
        else if (current == tail)
        {
            previous.setLink(current.getLink());
            current = null;
        }
        manyNodes--;