链表是用一组任意的存储单元来存储线性表中的数据元素（这组存储单元可以是连续的，也可以是不连续的）。
单链表节点定义
//定义线性表的行为，可供顺序表类和单链表类继承
public interface IListDS<T>
{
int GetLength();
void Insert(T item,int i);
void Add(T item);
bool IsEmpty();
T GetElement(int i);
void Delete(int i);
void Clear();
int LocateElement(T item);
void Reverse();
}
单链表操作实现
public class Node<T>
{
private T data;//数据域
private Node<T> next;//引用域
//构造器：数据域和引用域，普通结点
public Node(T val, Node<T> p)
{
data = val;
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 { retrun 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;
}
}
}
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();
}
}
