使用双圆链表在Java中实现多个大小数

public class DoubleCircularLinkedList {
    private Node head;
    private Node tail;

    private class Node {
        int data;
        Node prev;
        Node next;

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

    public void insert(int data) {
        Node newNode = new Node(data);
        if (head == null) {
            head = newNode;
            tail = newNode;
        } else {
            tail.next = newNode;
            newNode.prev = tail;
            tail = newNode;
        }
        tail.next = head;
        head.prev = tail;
    }

    public void delete(int data) {
        if (head == null) {
            return;
        }
        Node current = head;
        while (current != null) {
            if (current.data == data) {
                if (current == head) {
                    head = head.next;
                    tail.next = head;
                    head.prev = tail;
                } else if (current == tail) {
                    tail = tail.prev;
                    tail.next = head;
                    head.prev = tail;
                } else {
                    current.prev.next = current.next;
                    current.next.prev = current.prev;
                }
                return;
            }
            current = current.next;
            if (current == head) {
                break;
            }
        }
    }

    public void display() {
        if (head == null) {
            return;
        }
        Node current = head;
        while (current != null) {
            System.out.print(current.data + " ");
            current = current.next;
            if (current == head) {
                break;
            }
        }
        System.out.println();
    }
}