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 = ;
             dog.Bite();
             dog.GetAge();
             dog.BiteMan();
             Dog oldDog = new Dog();

             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");
         }
     }
 }