【Leetcode】Delete Node in a LinkedList

【题目】

Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.

Supposed the linked list is 1 -> 2 -> 3 -> 4 and you are given the third node with value 3, the linked list should become 1 -> 2 -> 4 after calling your function.

【思路】

The idea is to copy the data of next node to current node and then delete the next node.

【代码】

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public void deleteNode(ListNode node) {
        if(node!=null && node.next !=null){
			node.val = node.next.val;
			node.next = node.next.next;
		}
    }
}

为什么不能直接吧当前节点变成次啊一个节点？！！！