C#学习笔记-继承基本知识

namespace Inheritance
{
    class Program
    {
        static void Main(string[] args)
        {
            Dog dog = new Dog();
            dog.Age = 10;
            dog.Bite();
            dog.GetAge();
            dog.BiteMan();
            Dog oldDog = new Dog(10);


            Animal dog2 = new Dog();
            dog2.Bite();
            dog2.BiteMan();
            ((Dog)(dog2)).BiteMan();        //casts
            Console.ReadLine();
        }
    }

    public class Animal
    {
        public int Age
        {
            get;
            set;
        }
        public Animal()     //constructor
        {
            Console.WriteLine("Animal constructure");
        }

        public Animal(int age)
        {
            Console.WriteLine("Old Animal");
            this.Age = age;
        }

        public virtual void Bite()      //virtual can be override when it be inherited
        {
            Console.WriteLine( "Animal bite");
        }
        public virtual void GetAge()
        {
            Console.WriteLine(Age);
        }

        public void BiteMan()       //can't be overrided without virtual
        {
            Console.WriteLine("Animal bite man");
        }
    }
    public sealed class Dog : Animal        //sealed：can't be inherited
    {
        public Dog()        //constructor
        {
            Console.WriteLine("Dog constructure");
        }
        public Dog(int age):base(age)       //call specific function     
        {
            Console.WriteLine("Old Dog");
            this.Age = age;
        }
        public override void Bite()     //override the parent class method 
        {
            Console.WriteLine("Dog bite");
        }

        public new void BiteMan()       //new:new method which is as same as the parent class method,not override
        {
            Console.WriteLine("Dog bite man");
        }
    }
}