多态、抽象类示例

1、一个多态例子

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

namespace _09多态
{
    class Program
    {
        static void Main(string[] args)
        {
            //概念:让一个对象能够表现出多种的状态(类型)
            //实现多态的3种手段：1、虚方法 2、抽象类 3、接口

            Chinese cn1 = new Chinese("韩梅梅");
            Chinese cn2 = new Chinese("李雷");
            Japanese j1 = new Japanese("树下君");
            Japanese j2 = new Japanese("井边子");
            Korea k1 = new Korea("金秀贤");
            Korea k2 = new Korea("金贤秀");
            American a1 = new American("科比布莱恩特");
            American a2 = new American("奥尼尔");
            Person[] pers = { cn1, cn2, j1, j2, k1, k2, a1, a2, new English("格林"), new English("玛利亚") };

            for (int i = 0; i < pers.Length; i++)
            {
                //if (pers[i] is Chinese)
                //{
                //    ((Chinese)pers[i]).SayHello();
                //}
                //else if (pers[i] is Japanese)
                //{
                //    ((Japanese)pers[i]).SayHello();
                //}
                //else if (pers[i] is Korea)
                //{
                //    ((Korea)pers[i]).SayHello();
                //}
                //else
                //{
                //    ((American)pers[i]).SayHello();
                //}


                pers[i].SayHello();
            }
            Console.ReadKey();
        }
    }

    public class Person
    {
        private string _name;
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Person(string name)
        {
            this.Name = name;
        }
        public virtual void SayHello()
        {
            Console.WriteLine("我是人类");
        }

    }

    public class Chinese : Person
    {
        public Chinese(string name)
            : base(name)
        {

        }

        public override void SayHello()
        {
            Console.WriteLine("我是中国人，我叫{0}", this.Name);
        }
    }
    public class Japanese : Person
    {
        public Japanese(string name)
            : base(name)
        { }

        public override void SayHello()
        {
            Console.WriteLine("我是脚盆国人，我叫{0}", this.Name);
        }
    }
    public class Korea : Person
    {
        public Korea(string name)
            : base(name)
        {

        }


        public override void SayHello()
        {
            Console.WriteLine("我是棒之思密达，我叫{0}", this.Name);
        }
    }
    public class American : Person
    {
        public American(string name)
            : base(name)
        {

        }

        public override void SayHello()
        {
            Console.WriteLine("我叫{0}，我是米国人", this.Name);
        }
    }


    public class English : Person
    {
        public English(string name)
            : base(name)
        { }

        public override void SayHello()
        {
            Console.WriteLine("我是英国人");
        }
    }

}

2、多态练习

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

namespace _10多态练习
{
    class Program
    {
        static void Main(string[] args)
        {
            //真的鸭子嘎嘎叫 木头鸭子吱吱叫 橡皮鸭子唧唧叫
            //RealDuck rd = new RealDuck();
            //rd.Bark();
            //MuDuck md = new MuDuck();
            //md.Bark();
            //XPDuck xd = new XPDuck();
            //xd.Bark();
            //Console.ReadKey();

            //RealDuck rd = new RealDuck();
            //MuDuck md = new MuDuck();
            //XPDuck xd = new XPDuck();
            //RealDuck[] ducks = { rd, md, xd };
            //for (int i = 0; i < ducks.Length; i++)
            //{
            //    ducks[i].Bark();
            //}
            //Console.ReadKey();


            //经理十一点打卡 员工9点打卡 程序猿不打卡
            //Employee emp = new Employee();
            //Manager mg = new Manager();
            //Programmer pm = new Programmer();
            //Employee[] emps = { emp, mg, pm };
            //for (int i = 0; i < emps.Length; i++)
            //{
            //    emps[i].DaKa();
            //}
            //Console.ReadKey();



            //狗狗会叫 猫咪也会叫

        }
    }

    public class Animal
    {
        public void Bark()
        { 
            
        }
    }


    public class Employee
    {
        public virtual void DaKa()
        {
            Console.WriteLine("九点打卡");
        }
    }

    public class Manager : Employee
    {
        public override void DaKa()
        {
            Console.WriteLine("经理11点打卡");
        }
    }

    public class Programmer : Employee
    {
        public override void DaKa()
        {
            Console.WriteLine("程序猿不打卡");
        }
    }





    public class RealDuck
    {
        public virtual void Bark()
        {
            Console.WriteLine("真的鸭子嘎嘎叫");
        }
    }

    public class MuDuck : RealDuck
    {
        public override void Bark()
        {
            Console.WriteLine("木头鸭子吱吱叫");
        }
    }

    public class XPDuck : RealDuck
    {
        public override void Bark()
        {
            Console.WriteLine("橡皮鸭子唧唧叫");
        }
    }
}

3、抽象类的两个例子

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

namespace _11_抽象类
{
    class Program
    {
        static void Main(string[] args)
        {
            //狗狗会叫 猫咪会叫

            Animal a = new Cat();//new Dog();
            a.Bark();
            
            Console.ReadKey();
        }
    }

    public abstract class Animal
    {

        public virtual void T()
        {
            Console.WriteLine("动物有声明");
        }

        private int _age;

        public int Age
        {
            get { return _age; }
            set { _age = value; }
        }

        public Animal(int age)
        {
            this.Age = age;
        }
        public abstract void Bark();
        public abstract string Name
        {
            get;
            set;
        }

     //   public abstract string TestString(string name);


        public Animal()
        { 
            
        }
        //public void Test()
        //{ 
        //    //空实现
        //}
    }


    public abstract class Test : Animal
    { 
        
    }

    public class Dog : Animal
    {
       // public abstract void Test();


        public override void Bark()
        {
            Console.WriteLine("狗狗旺旺的叫");
        }

        public override string Name
        {
            get
            {
                throw new NotImplementedException();
            }
            set
            {
                throw new NotImplementedException();
            }
        }

        //public override string TestString(string name)
        //{
        //    //throw new NotImplementedException();
        //}
    }

    public class Cat : Animal
    {
        public override void Bark()
        {
            Console.WriteLine("猫咪喵喵的叫");
        }

        public override string Name
        {
            get
            {
                throw new NotImplementedException();
            }
            set
            {
                throw new NotImplementedException();
            }
        }
    }
}

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

namespace _12_抽象类
{
    class Program
    {
        static void Main(string[] args)
        {
            //使用多态求矩形的面积和周长以及圆形的面积和周长
            Shape shape = new Square(5, 6); //new Circle(5);
            double area = shape.GetArea();
            double perimeter = shape.GetPerimeter();
            Console.WriteLine("这个形状的面积是{0},周长是{1}", area, perimeter);
            Console.ReadKey();

        }
    }

    public abstract class Shape
    {
        public abstract double GetArea();
        public abstract double GetPerimeter();
    }
    public class Circle : Shape
    {

        private double _r;
        public double R
        {
            get { return _r; }
            set { _r = value; }
        }

        public Circle(double r)
        {
            this.R = r;
        }
        public override double GetArea()
        {
            return Math.PI * this.R * this.R;
        }

        public override double GetPerimeter()
        {
            return 2 * Math.PI * this.R;
        }
    }
    public class Square : Shape
    {
        private double _height;

        public double Height
        {
            get { return _height; }
            set { _height = value; }
        }

        private double _width;

        public double Width
        {
            get { return _width; }
            set { _width = value; }
        }

        public Square(double height, double width)
        {
            this.Height = height;
            this.Width = width;
        }

        public override double GetArea()
        {
            return this.Height * this.Width;
        }

        public override double GetPerimeter()
        {
            return (this.Height + this.Width) * 2;
        }
    }

}

4、用多态来实现 将 移动硬盘或者U盘或者MP3插到电脑上进行读写数据

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

namespace _13_电脑_移动硬盘_U盘_MP3
{
    class Program
    {
        static void Main(string[] args)
        {
            //用多态来实现 将 移动硬盘或者U盘或者MP3插到电脑上进行读写数据

            //MobileDisk md = new MobileDisk();
            //UDisk u = new UDisk();
            //Mp3 mp3 = new Mp3();
            //Computer cpu = new Computer();
            //cpu.CpuRead(u);
            //cpu.CpuWrite(u);
            //Console.ReadKey();

            MobileStorage ms = new UDisk();//new Mp3();//new MobileDisk();//new UDisk();
            Computer cpu = new Computer();
            cpu.Ms = ms;
            cpu.CpuRead();
            cpu.CpuWrite();
            //Computer cpu = new Computer();
            //cpu.CpuRead(ms);
            //cpu.CpuWrite(ms);
            Console.ReadKey();

        }
    }


    /// <summary>
    /// 抽象的父类
    /// </summary>
    public abstract class MobileStorage
    {
        public abstract void Read();
        public abstract void Write();
    }


    public class MobileDisk : MobileStorage
    {
        public override void Read()
        {
            Console.WriteLine("移动硬盘在读取数据");
        }
        public override void Write()
        {
            Console.WriteLine("移动硬盘在写入数据");
        }
    }
    public class UDisk : MobileStorage
    {
        public override void Read()
        {
            Console.WriteLine("U盘在读取数据");
        }

        public override void Write()
        {
            Console.WriteLine("U盘在写入数据");
        }
    }
    public class Mp3 : MobileStorage
    {
        public override void Read()
        {
            Console.WriteLine("MP3在读取数据");
        }

        public override void Write()
        {
            Console.WriteLine("Mp3在写入数据");
        }

        public void PlayMusic()
        {
            Console.WriteLine("MP3自己可以播放音乐");
        }
    }



    public class Computer
    {
        private MobileStorage _ms;

        public MobileStorage Ms
        {
            get { return _ms; }
            set { _ms = value; }
        }
        public void CpuRead()
        {
            Ms.Read();
        }

        public void CpuWrite()
        {
            Ms.Write();
        }
    }
}