Chapter 8. 面向对象（多态--虚方法）

namespace 多态
{
    public class Person
    {
        private string _name;

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

        public Person(string name)
        {
            this.Name = name;
        }

        //虚方法
        public virtual void SayHello()        
        {
            Console.WriteLine("我是人类");
        }
    }

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

        }

        //方法重写
        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)
        {

        }

        //方法重写
        public override void SayHello()
        {
            Console.WriteLine("我是日本人，我叫{0}", this.Name);
        }
    }

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

        }

        //方法重写
        public override void SayHello()
        {
            Console.WriteLine("我是韩国人，我叫{0}", this.Name);
        }
    }

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

        }

        //方法重写
        public override void SayHello()
        {
            Console.WriteLine("我是美国人，我叫{0}", this.Name);
        }
    }

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

        }

        //方法重写
        public override void SayHello()
        {
            Console.WriteLine("我是英国人，我叫{0}", this.Name);
        }
    }
}

class Program
    {
        static void Main(string[] args)
        {
            Chinese cn1 = new Chinese("程家阳");
            Chinese cn2 = new Chinese("王旭东");
            Japanese j1 = new Japanese("树下君");
            Japanese j2 = new Japanese("井边子");
            Korean k1 = new Korean("金秀贤");
            Korean k2 = new Korean("李钟硕");
            American a1 = new American("阿黛尔");
            American a2 = new American("小甜甜布兰妮");

            Person[] p = { cn1, cn2, j1, j2, k1, k2, a1, a2,
                             new Englishman("格林"),new Englishman("玛利亚") };

            for (int i = 0; i < p.Length; i++)
            {
                p[i].SayHello();
            }
            Console.ReadLine();
    }