学步园

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 泛型_一__什么是泛型
{
    public class GenericList<T>
    {
        private class Node
        {
            //字段
            private Node next;
            private T data;

            //有参构造函数
            public Node(T t)
            {
                next = null;
                data = t;
            }

            //属性 next
            public Node Next
            {
                get
                {
                    return next;
                }
                set
                {
                    next = value;
                }
            }
            public T Data
            {
                get
                {
                    return data;
                }
                set
                {
                    data = value;
                }
            }    
        }

        //字段
        private Node head;

        //无参构造函数
        public GenericList()
        {
            head = null;
        }

        //方法1
        //给Node添加元素
        public void AddHead(T t)
        {

            Node n = new GenericList<T>.Node(t);
            n.Next = head;
            head = n;
        }

        //方法2
        //IEnumerator<T> 接口，支持在泛型集合上进行简单的迭代
        //yield return 语句返回集合的一个元素,并移动到下一个元素上. yield break可停止迭代.
        public IEnumerator<T> GetEnumerator()
        {
            Node current = head;
            while (current !=null )
            {
                yield return current.Data;
                current = current.Next;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            //GenericList<T> 定义泛型类的对象list，并给予模板参数T为int型
            GenericList<int> list = new GenericList<int>();

            for (int x = 0; x < 10; x++)
            {
                list.AddHead(x);
            }

            foreach (int i in list)
            {
                System.Console.WriteLine("  " + i);
            }
            Console.WriteLine("/nDone/n");
            Console.ReadKey();

            GenericList<string> stringList = new GenericList<string>();
            for (int x = 0; x < 10; x++)
            {
                stringList.AddHead(x.ToString()+"****");
            }
            foreach (string str in stringList)
            {
                Console.WriteLine("  " + str);
            }
            Console.WriteLine("/nDone/n");
            Console.ReadKey();
        }
    }
}