当删除链表中的最后一个节点时，我将temp赋值为null，但它仍然在那里，没有被删除。Java

public class LinkedList {
    private Node head;

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

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

    public void deleteLastNode() {
        if (head == null) {
            return;
        }

        if (head.next == null) {
            head = null;
            return;
        }

        Node prev = null;
        Node temp = head;

        while (temp.next != null) {
            prev = temp;
            temp = temp.next;
        }

        prev.next = null;
        temp = null;
    }
}