Q:
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.
A：
public void deleteNode (ListNode node){
node.val = node.next.val;
node.next = node.next.next;
}
就是个很基础的概念：
temp.setNext(temp.getNext().getNext())
