链式堆栈(LinkStack)的实现
先定义节点Node.cs
namespace 栈与队列
{
public class Node<T>
{
private T data;
private Node<T> next;
public Node(T data, Node<T> next)
{
this.data = data;
this.next = next;
}
public Node(Node<T> next)
{
this.next = next;
this.data = default(T);
}
public Node(T data)
{
this.data = data;
this.next = null;
}
public Node()
{
this.data = default(T);
this.next = null;
}
public T Data {
get { return this.data; }
set { this.data = value; }
}
public Node<T> Next
{
get { return next; }
set { next = value; }
}
}
}
下面是LinkStack.cs
using System;
using System.Text;
namespace 栈与队列
{
public class LinkStack<T>:IStack<T>
{
private Node<T> top;
private int num;//节点个数
/// <summary>
/// 顶部节点
/// </summary>
public Node<T> Top
{
get { return top; }
set { top = value; }
}
public LinkStack()
{
top = null;
num = 0;
}
public int Count()
{
return num;
}
public void Clear()
{
top = null;
num = 0;
}
public bool IsEmpty()
{
if (top == null && num == 0)
{
return true;
}
else
{
return false;
}
}
public void Push(T item)
{
Node<T> q = new Node<T>(item);
if (top == null)
{
top = q;
}
else
{
q.Next = top;
top = q;
}
num++;
}
public T Pop()
{
if (IsEmpty())
{
Console.WriteLine("Stack is empty!");
return default(T);
}
Node<T> p = top;
top = top.Next;
num--;
return p.Data;
}
public T Peek()
{
if (IsEmpty())
{
Console.WriteLine("Stack is empty!");
return default(T);
}
return top.Data;
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
if (top != null)
{
sb.Append(top.Data.ToString() + ",");
Node<T> p = top;
while (p.Next != null)
{
sb.Append(p.Next.Data.ToString()+ ",");
p = p.Next;
}
}
return sb.ToString();
}
}
}
测试代码片段：
Console.WriteLine("顺序堆栈测试开始...");
SeqStack<int> seqStack = new SeqStack<int>(10);
seqStack.Push(1);
seqStack.Push(2);
seqStack.Push(3);
Console.WriteLine(seqStack);
Console.WriteLine(seqStack.Peek());
Console.WriteLine(seqStack);
Console.WriteLine(seqStack.Pop());
Console.WriteLine(seqStack);
Console.WriteLine("链堆栈测试开始...");
LinkStack<int> linkStack = new LinkStack<int>();
linkStack.Push(1);
linkStack.Push(2);
linkStack.Push(3);
Console.WriteLine(linkStack);
Console.WriteLine(linkStack.Peek());
Console.WriteLine(linkStack);
Console.WriteLine(linkStack.Pop());
Console.WriteLine(linkStack);
Console.ReadLine();
