coding interviews 03 倒序打印链表

public static ArrayList<Integer> printListFromTailToHead(ListNode listNode) {
    Stack<Integer> stack = new Stack<Integer>();
    ArrayList<Integer> result = new ArrayList<Integer>();
    //push into stack
    while(listNode!=null){
        stack.push(listNode.val);
        listNode = listNode.next;
    }
    //pop and push into list
    while (!stack.isEmpty()){
        result.add(stack.pop());
    }
    return result;
}