抽象类

学习：
 1     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();
            }
        }
    }