C#代码实现栈与队列数据结构

using System;
using System.Collections.Generic;
using System.Text;

namespace Car_Stop
{
    class Node        //--------------------------------------------节点类
    {
        public string info;
        public DateTime dtime;
        public Node next;
        public Node(string i, DateTime j, Node n)    //堆栈中用的节点
        {
            info = i;
            dtime = j;
            next = n;
        }
        public Node(string i, Node n)    //队列中用的节点
        {
            info = i;
            next = n;
        }
    }
    //-----------------------------------------------------------堆栈类
    class Stacks  //链表实现的堆栈
    {
        Node top;
        public Stacks()
        {
            top = null;

        }
        public bool empty()  //判断栈空
        {
            if (top == null)
                return (true);
            else
                return (false);
        }
        public void push(string carno, DateTime time)  //重载入栈，需要记时的
        {
            Node fresh;
            fresh = new Node(carno, time, null);
            fresh.next = top;
            top = fresh;
        }
        public Node pop()   //出栈
        {
            Node tmp;
            if (empty())
                return null;
            else
            {
                tmp = top;
                top = top.next;
                return tmp;
            }
        }
    }
    //------------------------------------------------------------------队列类
    class Queues   //链表实现的队列