(JAVA)如何删除循环双向链表中的第一个元素？

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

public class DoublyLinkedList {
    private Node head;
    
    // 其他方法...
    
    public void deleteFirstElement() {
        if (head == null) {
            throw new RuntimeException("链表为空，无法删除元素");
        }
        
        Node first = head.next;
        
        if (first == head) {
            // 链表只有一个元素的情况
            head = null;
        } else {
            Node last = head.prev;
            head = first;
            last.next = first;
            first.prev = last;
        }
        
        // 将第一个元素的引用置为null
        first = null;
    }
}