//单链表结点类,采用泛型 public class Node<T> { private T data; //数据域,当前结点的数据 private Node<T> next; //引用域,即下一结点 //构造器：数据域+引用域，普通结点 public Node(T item, Node<T> p) { data = item; next = p; } //构造器：引用域，头结点 public Node(Node<T> p) { next = p; } //构造器：数据域，尾结点 public Node(T val) { data = val; next = null; } //构造器：无参数 public Node() { 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 Node<T> Next { get { return next; } set { next = value; } } } //链表类，包含链表定义及基本操作方法 public class MyLinkList<T> { private Node<T> head; //单链表的头结点 //头结点属性 public Node<T> Head { get { return head; } set { head = value; } } //构造器 public MyLinkList() { head = null; } //求单链表的长度 public int GetLength() { Node<T> p = head; int len = 0; while (p != null) { ++len; p = p.Next; } return len; } //清空单链表 public void Clear() { head = null; } //判断单链表是否为空 public bool IsEmpty() { if (head == null) { return true; } else { return false; } } //在单链表的末尾添加新元素 public void Append(T item) { Node<T> q = new Node<T>(item); Node<T> p = new Node<T>(); if (head == null) { head = q; return; } p = head; while (p.Next != null) { p = p.Next; } p.Next = q; } //在单链表的第i个结点的位置前插入一个值为item的结点 public void Insert(T item, int i) { if (IsEmpty() || i < 1||i>GetLength ()) { Console.WriteLine("LinkList is empty or Position is error!"); return; } if (i == 1) { Node<T> q = new Node<T>(item); q.Next = head; head = q; return; } Node<T> p = head; Node<T> r = new Node<T>(); int j = 1; while (p.Next != null && j < i) { r = p; p = p.Next; ++j; } if (j == i) { Node<T> q = new Node<T>(item); q.Next = p; r.Next = q; } } //在单链表的第i个结点的位置后插入一个值为item的结点 public void InsertPost(T item, int i) { if (IsEmpty() || i < 1||i>GetLength ()) { Console.WriteLine("LinkList is empty or Position is error!"); return; } if (i == 1) { Node<T> q = new Node<T>(item); q.Next = head.Next; head.Next = q; return; } Node<T> p = head; int j = 1; while (p != null && j < i) { p = p.Next; ++j; } if (j == i) { Node<T> q = new Node<T>(item); q.Next = p.Next; p.Next = q; } } //删除单链表的第i个结点 public T Delete(int i) { if (IsEmpty() || i < 0 || i > GetLength()) { Console.WriteLine("LinkList is empty or Position is error!"); return default(T); } Node<T> q = new Node<T>(); if (i == 1) { q = head; head = head.Next; return q.Data; } Node<T> p = head; int j = 1; while (p.Next != null && j < i) { ++j; q = p; p = p.Next; } if (j == i) { q.Next = p.Next; return p.Data; } else { Console.WriteLine("The "+i+"th node is not exist!"); return default(T); } } //获得单链表的第i个数据元素 public T GetElem(int i) { if (IsEmpty() || i < 0) { Console.WriteLine("LinkList is empty or position is error! "); return default(T); } Node<T> p = new Node<T>(); p = head; int j = 1; while (p.Next != null && j < i) { ++j; p = p.Next; } if (j == i) { return p.Data; } else { Console.WriteLine("The "+i+"th node is not exist!"); return default(T); } } //在单链表中查找值为value的结点 public int Locate(T value) { if (IsEmpty()) { Console.WriteLine("LinkList is Empty!"); return -1; } Node<T> p = new Node<T>(); p = head; int i = 1; while (!p.Data.Equals(value) && p.Next != null) { p = p.Next; ++i; } return i; } //显示链表 public void Display() { Node<T> p = new Node<T>(); p = this.head; while (p != null) { Console.Write(p.Data+" "); p = p.Next; } } }
实例测试程序代码
public class Program { static void Main(string[] args) { MyLinkList<string> myLinkList = new MyLinkList<string>(); //实例化一个单链表 Console.WriteLine(myLinkList.GetLength()); //获取长度 //添加元素 myLinkList.Append("good"); myLinkList.Append("monring"); myLinkList.Append("lwk"); myLinkList.Insert("!", 5); //在i结点前插元素，位置错误测试 myLinkList.InsertPost("!", 5); //在i结点后插元素，位置错误测试 myLinkList.InsertPost("!", 3); //后插元素 myLinkList.Insert(",", 3); //前插元素 myLinkList.Display(); //显示链表元素 Console.WriteLine(myLinkList.GetElem(4));//获取结点,并显示 myLinkList.Delete(1); //删除结点 myLinkList.Display(); Console.WriteLine(myLinkList.GetLength()); //显示链表长度 Console.Read(); } }
