将文件读入类中具有节点结构的链表C++

class Node {
public:
    int data;
    Node* next;
};

class LinkedList {
private:
    Node* head;
public:
    LinkedList();
    void insert(int data);
    void display();
    void readFile(string filename);
};

void LinkedList::readFile(string filename) {
    ifstream file(filename);
    if (file.is_open()) {
        int data;
        while (file >> data) {
            insert(data);
        }
        file.close();
    }
}

int main() {
    LinkedList list;
    list.readFile("data.txt");
    list.display();
    return 0;
}