C# 队列

Queue 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace DataStructure
{
    /// <summary>
    /// 队列接口
    /// </summary>
    interface IQueue<T>
    {
        void EnQueue(T elem);         //入队列操作
        T DeQueue();                  //出队列操作
        T GetFront();                 //取对头元素
        int GetLength();              //求队列的长度
        bool IsEmpty();               //判断队列是否为空
        void Clear();                 //清空队列
        bool IsFull();                //判断队列是否为满
    }

    /// <summary>
    /// 银行队列接口
    /// </summary>
    interface IBankQueue : IQueue<int>
    {
        int GetCallnumber();          //获取服务号码
    }


    /// <summary>
    /// 循环顺序队列
    /// </summary>
    /// <typeparam name="T"></typeparam>
    class CSeqQueue<T> : IQueue<T>
    {
        private int maxsize;       //循环顺序队列的容量
        private T[] data;          //数组，用于存储循环顺序队列中的数据元素
        private int front;         //指示最近一个已经离开队列的元素所占有的位置 循环顺序队列的对头
        private int rear;          //指示最近一个进入队列的元素的位置           循环顺序队列的队尾

        public T this[int index]
        {
            get { return data[index]; }
            set { data[index] = value; }
        }

        //容量属性
        public int Maxsize
        {
            get { return maxsize; }
            set { maxsize = value; }
        }

        //对头指示器属性
        public int Front
        {
            get { return front; }
            set { front = value; }
        }

        //队尾指示器属性
        public int Rear
        {
            get { return rear; }
            set { rear = value; }
        }

        public CSeqQueue()
        {
 
        }

        public CSeqQueue(int size)
        {
            data = new T[size];
            maxsize = size;
            front = rear = -1;
        }

        //判断循环顺序队列是否为满
        public bool IsFull()
        {
            if ((front == -1 && rear == maxsize - 1) || (rear + 1) % maxsize == front)
                return true;
            else
                return false;
        }

        //清空循环顺序列表
        public void Clear()
        {
            front = rear = -1;
        }

        //判断循环顺序队列是否为空
        public bool IsEmpty()
        {
            if (front == rear)
                return true;
            else
                return false;
        }

        //入队操作
        public void EnQueue(T elem)
        {
            if (IsFull())
            {
                Console.WriteLine("Queue is Full !");
                return;
            }
            rear = (rear + 1) % maxsize;
            data[rear] = elem;
        }

        //出队操作
        public T DeQueue()
        {
            if (IsEmpty())
            {
                Console.WriteLine("Queue is Empty !");
                return default(T);
            }
            front = (front + 1) % maxsize;
            return data[front];
        }

        //获取对头数据元素
        public T GetFront()
        {
            if (IsEmpty())
            {
                Console.WriteLine("Queue is Empty !");
                return default(T);
            }
            return data[(front + 1) % maxsize];//front从-1开始
        }

        //求循环顺序队列的长度
        public int GetLength()
        {
            return (rear - front + maxsize) % maxsize;
        }
    }

    /// <summary>
    /// 链队列结点类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    class QueueNode<T>
    {
        private T data;                   //数据域
        private QueueNode<T> next;        //引用域

        public QueueNode(T val, QueueNode<T> p)
        {
            data = val;
            next = p;
        }

        public QueueNode(QueueNode<T> p)
        {
            next = p;
        }

        public QueueNode(T val)
        {
            data = val;
            next = null;
        }

        public QueueNode()
        {
            data = default(T);
            next = null;
        }

        //数据域属性
        public T Data
        {
            get { return data; }
            set { data = value; }
        }

        //引用域属性
        public QueueNode<T> Next
        {
            get { return next; }
            set { next = value; }
        }
    }

    /// <summary>
    /// 链队列类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    class LinkQueue<T> : IQueue<T>
    {
        private QueueNode<T> front;    //队列头指示器
        private QueueNode<T> rear;     //队列尾指示器
        private int size;              //队列结点个数

        //队列属性
        public QueueNode<T> Front
        {
            get { return front; }
            set { front = value; }
        }

        public QueueNode<T> Rear
        {
            get { return rear; }
            set { rear = value; }
        }

        public int Size
        {
            get { return size; }
            set { size = value; }
        }

        //初始化链队列
        public LinkQueue()
        {
            front = rear = null;
            size = 0;
        }

        public int GetLength()
        {
            return size;
        }

        public void Clear()
        {
            front = rear = null;
            size = 0;
        }

        public bool IsEmpty()
        {
            if ((front == rear) && (size == 0))
                return true;
            else
                return false;

        }

        //链队列没有容量限制 返回false
        public bool IsFull()
        {
            return false;
        }

        //入队操作
        public void EnQueue(T item)
        {
            QueueNode<T> q = new QueueNode<T>(item);
            if (IsEmpty())
            {
                front = q;
                rear = q;
            }
            else
            {
                rear.Next = q;
                rear = q;
            }
            ++size;
        }

        //出对操作
        public T DeQueue()
        {
            if (IsEmpty())
            {
                Console.WriteLine("Queue is Empty !");
                return default(T);
            }
            QueueNode<T> p = front;
            front = front.Next;

            if (front == null)
            {
                rear = null;
            }
            --size;
            return p.Data;
        }

        //获取链队列头结点的值
        public T GetFront()
        {
            if (IsEmpty())
            {
                Console.WriteLine("Queue is Empty !");
                return default(T);
            }
            return front.Data;
        }
 
    }


    /// <summary>
    /// 银行叫号链队列类
    /// </summary>
    class LinkBankQueue : LinkQueue<int>, IBankQueue
    {
        private int callnumber;

        public int Callnumber
        {
            get { return callnumber; }
            set { callnumber = value; }
        }

        //获取服务号码
        public int GetCallnumber()
        {
            if ((IsEmpty()) && callnumber == 0)
            {
                callnumber = 1;
            }
            else
                callnumber++;
            return callnumber;
        }
    }

    /// <summary>
    /// 银行叫号顺序队列类
    /// </summary>
    class CSeqBankQueue : CSeqQueue<int>, IBankQueue
    {
        private int callnumber;  //记录系统自动产生的新来顾客的服务号码

        public int Callnumber
        {
            get { return callnumber; }
            set { callnumber = value; }
        }

        public CSeqBankQueue()
        {
 
        }

        public CSeqBankQueue(int size)
            : base(size)
        {
 
        }

        //获得服务号码
        public int GetCallnumber()
        {
            if ((IsEmpty()) && callnumber == 0)
            {
                callnumber = 1;
            }
            else
            {
                callnumber++;
            }
            return callnumber;
        }
    }

    /// <summary>
    /// 服务窗口类
    /// </summary>
    class ServiceWindow
    {
        IBankQueue bankQ;

        //服务队列属性
        public IBankQueue BankQ
        {
            get { return bankQ; }
            set { bankQ = value; }
        }

        public void Service()
        {
            while (true)
            {
                Thread.Sleep(10000);
                if (!bankQ.IsEmpty())
                {
                    Console.WriteLine();
                    lock (bankQ)
                    {
                        Console.WriteLine("请{0}号到{1}号窗口！", bankQ.DeQueue(), Thread.CurrentThread.Name);
                    }
                }
            }
        }
    }

    class Queue
    {

        static void Main()
        {
            IBankQueue bankQueue = null;
            Console.WriteLine("请选择存储结构的类型：1.顺序队列 2.链队列：");
            char selectFlag = Convert.ToChar(Console.ReadLine());
            switch (selectFlag)
            {
                /*初始化顺序队列*/
                case '1':
                    int count;             //接受循环顺序队列的容量
                    Console.WriteLine("请输入队列可容纳的人数：");
                    count = Convert.ToInt32(Console.ReadLine());
                    bankQueue = new CSeqBankQueue(count);
                    break;
                /*初始化链队列*/
                case '2':
                    bankQueue = new LinkBankQueue();
                    break;

            }
            int windowcount = 4;       //设置银行柜台的服务窗口数

            ServiceWindow[] sw = new ServiceWindow[windowcount];
            Thread[] swt = new Thread[windowcount];
            for (int i = 0; i < windowcount; i++)
            {
                sw[i] = new ServiceWindow();
                sw[i].BankQ = bankQueue;
                swt[i] = new Thread(new ThreadStart(sw[i].Service));
                swt[i].Name = "" + (i + 1);
                swt[i].Start();
            }
            while (true)
            {
                Console.WriteLine("请点击触摸屏获取号码：");
                Console.ReadLine();

                int callnumber;
                if (!bankQueue.IsFull())
                {
                    callnumber = bankQueue.GetCallnumber();
                    Console.WriteLine("您的号码是：{0}，您前面有{1}位，请等待！", callnumber, bankQueue.GetLength());
                    bankQueue.EnQueue(callnumber);
                }
                else
                    Console.WriteLine("现在业务繁忙，请稍后再来！");
                Console.WriteLine();
            }
        }
    }
}