leetcode237 Delete Node in a LinkedList java

Description

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.

很简单的一个题目：
难点就是遍历到这个node的时候，是不知道他的前一个节点信息的。所以，我们可以把要删除的node节点的next删掉，并把它的信息（val以及next）copy到node节点即可。

    public void deleteNode(ListNode node) {
        node.val = node.next.val;
        node.next = node.next.next;
    }