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 { 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 : IQueue { 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 { private T data; private Node next; public Node(T data) { this.data = data; } public T Data { get { return data; } set { data = value; } } public Node Next { get { return next; } set { next = value; } } } }

 //链队列的实现类 namespace 队列 { class LinkQueue : IQueue { private Node front; //头结点 private Node 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 newNode = new Node(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 queue = new Queue(); //自己的写的顺序队列 //SeqQueue queue = new SeqQueue(); //自己的链队列 LinkQueue queue = new LinkQueue(); 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(); } } }