如何从头开始创建对象的LinkedList (不使用java的API)

// 节点类
class Node {
    int data;
    Node next;

    public Node(int data) {
        this.data = data;
        this.next = null;
    }
}

// LinkedList类
class LinkedList {
    Node head;

    public LinkedList() {
        this.head = null;
    }

    // 插入节点
    public void insert(int data) {
        Node newNode = new Node(data);
        if (head == null) {
            head = newNode;
        } else {
            newNode.next = head;
            head = newNode;
        }
    }

    // 删除节点
    public void delete(int data) {
        if (head == null) {
            return;
        }
        if (head.data == data) {
            head = head.next;
            return;
        }
        Node curr = head;
        while (curr.next != null) {
            if (curr.next.data == data) {
                curr.next = curr.next.next;
                return;
            }
            curr = curr.next;
        }
    }

    // 查找节点
    public boolean search(int data) {
        Node curr = head;
        while (curr != null) {
            if (curr.data == data) {
                return true;
            }
            curr = curr.next;
        }
        return false;
    }
}

// 测试代码
public class Main {
    public static void main(String[] args) {
        LinkedList list = new LinkedList();
        list.insert(3);
        list.insert(5);
        list.insert(8);

        System.out.println("LinkedList: ");
        Node curr = list.head;
        while (curr != null) {
            System.out.print(curr.data + " ");
            curr = curr.next;
        }
        System.out.println();

        list.delete(5);

        System.out.println("LinkedList after deleting 5: ");
        curr = list.head;
        while (curr != null) {
            System.out.print(curr.data + " ");
            curr = curr.next;
        }
        System.out.println();

        System.out.println("Search 8: " + list.search(8));
        System.out.println("Search 5: " + list.search(5));
    }
}