1播放器练习讲解

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

namespace PlayerTask
{
    /// <summary>
    /// 播放器类型
    /// </summary>
    public enum PlayerType
    { 
        MP3,
        WalkMan,
        iPod
    }

    public abstract class Player
    {
        private int _Price;

        public int Price
        {
            get { return _Price; }
        }

        private string _Color;

        public string Color
        {
            get { return _Color; }
        }

        public Player(int price):this(price,"无色")
        {

        }

        public Player(int price,string color)
        {
            this._Price = price;
            this._Color = color;
        }

        public void Show()//显示价格{0},颜色{1}
        {
            Console.WriteLine("价格{0},颜色{1}",this._Price,this._Color);
        }

        public abstract void Play();//抽象方法
    }

    public class Mp3 : Player
    {
        public Mp3():base(150)
        {

        }
        public override void Play()
        {
            Console.WriteLine("MP3播放");
        }
    }

    public class WalkMan : Player
    {
        public WalkMan():base(200)
        {

        }

        public override void Play()
        {
            Console.WriteLine("WalkMan播放");
        }
    }


    public class iPod : Player
    {
        public iPod():base(300)
        {

        }

        public override void Play()
        {
            Console.WriteLine("iPod播放");
        }
    }


    public class Young
    {
        public void ListenMusic(Player player)
        {
            player.Play();
        }
    }

    public class Shop
    {
        public Player Sale(PlayerType type)
        {
            Player p = null;
            if (type == PlayerType.MP3)
            {
                p = new Mp3();
            }
            else if (type == PlayerType.iPod)
            {
                p = new iPod();
            }
            else
            {
                p = new WalkMan();
            }
            return p;
        }


        public Player Sale(int price)
        { 
            Player p=null;
            if (price > 1000)
            {
                p = new iPod();
            }
            else if (price >= 500)
            {
                p = new Mp3();
            }
            else
            {
                p = new WalkMan();
            }
            return p;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            //听音乐
            Player p = null;
            //让mp3播放
            p = new Mp3();
            Young y = new Young();
            y.ListenMusic(p);

            //让Ipod播放
            p = new iPod();
            y.ListenMusic(p);

            //购买
            Shop s = new Shop();
            p = s.Sale(1200);
            p.Play();

            p = s.Sale(PlayerType.MP3);
            p.Play();

        }
    }
}