// Move o cursor adiante
public void advanced() {
    cursor = cursor.getNext();
}

@Override
public String toString() {
    if (cursor == null) {
        return "[]";
    }
    String toString = "[..." + cursor.getElement();
    CNode oldCursor = cursor;
    for (advanced(); oldCursor != cursor; advanced()) {
        toString += ", " + cursor.getElement();
    }
    return toString + "...]";
}