using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace m1w3d5_virtual
{
    #region 多态 用虚方法实现
    //多态实现 真的鸭子嘎嘎叫，木头鸭子吱吱叫，橡皮鸭子唧唧叫
    //多态 不同的实际对象，在同一个指令（叫），有不同的表现
    //不同的对象，如何统一管理 里氏转换：可以把子级当父级 如果这些不同的对象全继承自一个父类
    //统一管理 如果把子级转换成了父级，子级的特性丢失了
    //用虚方法可以 用父级管理并且保留子级的特性 已解决问题
    //1，在实例方法前加 virtual
    //2，在派生类中用 override 重写 同名/同签名的方法
    //在一个虚方法被调用时，会根据最后重写的那个方法和实际类型来决定
    //不会根据当前类型来执行方法
    class Duck
    {
        public string name;
        public virtual void Cry()
        {
            Console.WriteLine("，我是{0}", name);
        }
    }
    class TrueDuck : Duck
    {
        public TrueDuck()
        {
            this.name = "真的鸭子";
        }
        public override void Cry()
        {
            Console.Write("嘎嘎");
            base.Cry();
        }
    }
    class WoodDuck : Duck
    {
        public WoodDuck()
        {
            this.name = "木头鸭子";
        }
        public override void Cry()
        {
            Console.Write("吱吱");
            base.Cry();
        }
    }
    class RubberDuck : Duck
    {
        public RubberDuck()
        {
            this.name = "橡皮鸭子";
        }
        public override void Cry()
        {
            Console.Write("唧唧");
            base.Cry();
        }
    }
    //
    class BeiJingDuck : TrueDuck
    {
        public BeiJingDuck()
        {
            this.name = "北京烤鸭";
        }
        public override void Cry()
        {
            Console.WriteLine("欢迎光临，我是{0}",name);
            //base.Cry();
        }
    }
    #endregion
    #region 多态 练习
    //打卡 时间有不同
    class Person
    {
        public string name;
        public virtual void PunchCard()
        {
            Console.WriteLine("，我是{0}",name);
        }
    }
    class Employee : Person
    {
        public Employee()
        {
            this.name = "员工";
        }
        public override void PunchCard()
        {
            Console.Write("{0}，九点打卡", DateTime.Now);
            base.PunchCard();
        }
    }
    class Manager : Person
    {
        public Manager()
        {
            this.name = "经理";
        }
        public override void PunchCard()
        {
            Console.Write("{0}，十一点打卡", DateTime.Now);
            base.PunchCard();
        }
    }
    class Programmer : Person
    {
        public Programmer()
        {
            this.name = "程序员";
        }
        public override void PunchCard()
        {
            Console.Write("{0}，不用打卡", DateTime.Now);
            base.PunchCard();
        }
    }
    #endregion
    class Program
    {
        static void Main(string[] args)
        {
            #region 多态 用虚方法实现
            Random roll = new Random();
            TrueDuck trueduck = new TrueDuck();
            WoodDuck woodduck = new WoodDuck();
            RubberDuck ruberduck = new RubberDuck();
            trueduck.Cry();
            woodduck.Cry();
            ruberduck.Cry();
            Console.WriteLine();
            //当你转换成父类的时候，你会丢失子类的特性
            Duck[] ducks = new Duck[10];
            for (int i = 0; i < ducks.Length; i++)
            {
                int num = roll.Next(0, 150);
                if (num < 30)
                {
                    ducks[i] = new RubberDuck();
                }
                else if (num < 60)
                {
                    ducks[i] = new WoodDuck();
                }
                else if (num < 90)
                {
                    ducks[i] = new WoodDuck();
                }
                else
                {
                    ducks[i] = new BeiJingDuck();
                }
            }
            foreach (var item in ducks)
            {
                item.Cry();
            }
            Console.WriteLine();
            #endregion
            #region 多态 练习
            //打卡 时间有不同
            Employee employee = new Employee();
            Manager manager = new Manager();
            Programmer programmer = new Programmer();
            employee.PunchCard();
            manager.PunchCard();
            programmer.PunchCard();
            Console.WriteLine();
            #endregion
        }
    }
}