C#实现顺序队列和链队列的代码实例

//自定义队列接口namespace 队列{  interface IQueue<T>  {    int Count { get; }    int GetLength();    bool IsEmpty();    void Clear();    void Enqueue(T item);    T Dequeue();    T Peek();  }}

//顺序队列的实现类namespace 队列{  class SeqQueue<T> : IQueue<T>  {    private T[] data;    private int count; //表示当前有几个元素    private int front; //队首  （队首索引-1）    private int rear;  //队尾 （队尾元素索引）    public SeqQueue(int size)    {      data = new T[size];      count = 0;      front = -1;      rear = -1;    }    public SeqQueue()    {      data = new T[10];      count = 0;      front = -1;      rear = -1;    }    public int Count    {      get      {        return count;      }    }    public void Clear()    {      count = 0;      front = -1;      rear = -1;    }    public T Dequeue()    {      if(count > 0)      {        T temp = data[front + 1];        front++;        count--;        return temp;      }      else      {        Console.WriteLine("队列中没有数据，无法取得队首数据");        return default(T);      }    }    public void Enqueue(T item)    {      if (count == data.Length)      {        Console.WriteLine("队列元素已满，不可添加");      }      else      {        if (rear == data.Length -1) //最后一个位置是否有值        {          data[0] = item;          rear = 0;          count++;        }        else        {          data[rear + 1] = item;          rear += 1;          count++;        }      }    }    public int GetLength()    {      return count;    }    public bool IsEmpty()    {      return count == 0;    }    public T Peek()    {      T temp = data[front + 1];      return temp;    }  }}

//链队列的节点类namespace 队列{  class Node<T> {    private T data;    private Node<T> next;    public Node(T data)    {      this.data = data;    }    public T Data    {      get { return data; }      set { data = value; }    }    public Node<T> Next    {      get { return next; }      set { next = value; }    }  }}

//链队列的实现类namespace 队列{  class LinkQueue<T> : IQueue<T>  {    private Node<T> front; //头结点    private Node<T> rear; //尾结点    private int count; //表示元素个数    public LinkQueue()    {      front = null;      rear = null;      count = 0;    }    public int Count    {      get      {        return count;      }    }    public void Clear()    {      front = null;      rear = null;      count = 0;    }    public T Dequeue()    {      if (count == 0)      {        Console.WriteLine("队列为空");        return default(T);      }else if(count == 1)      {        T temp = front.Data;        front = rear = null;        count = 0;        return temp;      }      else      {        T temp = front.Data;        front = front.Next;        count--;        return temp;      }    }    public void Enqueue(T item)    {      Node<T> newNode = new Node<T>(item);      if (count == 0)      {        front = newNode;        rear = newNode;        count = 1;      }      else      {        rear.Next = newNode;        rear = newNode;        count++;      }    }    public int GetLength()    {      return count;    }    public bool IsEmpty()    {      return count == 0;    }    public T Peek()    {      if (front != null)      {        return front.Data;      }      else      {        return default(T);      }    }  }}

//以上两个实现类的测试类namespace 队列{  class Program  {    static void Main(string[] args)    {      //CRL中的队列      //Queue<int> queue = new Queue<int>();      //自己的写的顺序队列      //SeqQueue<int> queue = new SeqQueue<int>();      //自己的链队列      LinkQueue<int> queue = new LinkQueue<int>();      queue.Enqueue(12);      queue.Enqueue(34);      queue.Enqueue(56);      queue.Enqueue(78);      queue.Enqueue(90);      Console.WriteLine("添加五个元素后的大小："+ queue.Count);      int i = queue.Dequeue();  //出队（取出并删除）      Console.WriteLine("取出的元素是： " + i);      Console.WriteLine("出队后队列大小：" + queue.Count);      int j = queue.Peek();      Console.WriteLine("Peek取出的元素是： " + j);      Console.WriteLine("PeeK后队列大小：" + queue.Count);      queue.Clear();      Console.WriteLine("清空后的队列大小：" + queue.Count);      Console.ReadKey();    }  }}