anan

 public boolean remove(int number) {
        ListCell prev = null;
        ListCell cell = this.head;

        while (cell != null) {
            if (cell.number == number) {
                if (prev != null) {
                    prev.next = cell.next;
                } else {
                    // If no prev, already, it is first.
                    this.head = this.head.next;
                }
                return true;
            }
            prev = cell;
            cell = cell.next;
        }
        return false;
    }