@Override
    public boolean equals(Object o) {
        if (o == this)
            return true;
        if (o == null)
            return false;
        if (!(o instanceof NumberList))
            return false;

        NumberList list = (NumberList) o;

        if (list.size != size)
            return false;

        Node myNode = firstNode;
        Node listNode = list.firstNode;

        do {
            if (myNode.value != listNode.value)
                return false;

            if (listNode.nextNode == null)
                return false;
            myNode = myNode.nextNode;
            listNode = listNode.nextNode;
        } while (myNode != firstNode);

        return true;
    }