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

namespace ConsoleApplication1
{
    //public class Pet {
    //    public Pet(string name) {
    //        _name = name;
        
    //    }
    //    protected string _name;
    //    public void PrintName() {

    //        Console.WriteLine("Pet`s name is"+_name);  
    //    }
    //   //虚方法
    //    virtual public void speak() {

    //        Console.WriteLine(_name+"is speaking");
    //    }
    //}
    //结构
    struct fish {
        int weight;
        int price;
    
    }
    //接口
    interface ICatchMice {

        void catchMice();
    }
    interface IClimbTree {

        void climbTree();
    }
   abstract public class Pet
    {
        public Pet(string name)
        {
            _name = name;

        }
        protected string _name;
        public void PrintName()
        {

            Console.WriteLine("Pet`s name is" + _name);
        }
        //抽象类，没有函数体，无法实例化
        abstract public void speak();
        //{

            //Console.WriteLine(_name + "is speaking");
        //}
    }
    //狗类
    public class Dog : Pet {
        //静态
        static int num;
        static Dog() {
            num = 0;
        
        }
        //构造函数
        public Dog(string name):base(name) {
            //_name = name;
            ++num;
        
        }
        new public void PrintName() {
            Console.WriteLine("我的宠物是"+_name);
        }
        public override void speak()//重写
        {
            Console.WriteLine(_name + " is speaking"+" wow");
        }
        static public void ShowNum() {

            Console.WriteLine("有"+num+"条狗");
        }
    }
    //猫类
    public class Cat : Pet,ICatchMice,IClimbTree {
        //构造函数
        public Cat(string name):base(name) {
            //_name = name;
        
        }
        new public void PrintName() {
            Console.WriteLine("我的宠物是"+_name);
        }
        public override void speak()
        {
            Console.WriteLine(_name + "is speaking"+" meow");
        }
        public void catchMice() {

            Console.WriteLine("catchmice");
        }
        public void climbTree() {
            Console.WriteLine("climbtree");
        }
    
    }
    //静态类，方法扩展
    static class PetGuide{

        static public void HowToFeed(this Dog dog) {
            Console.WriteLine("Play a vedio how to feed dog");
        }
    
    }
    class Program
    {
        static void Main(string[] args)
        {

            //Dog Dog = new Dog();
            //Dog.Name = "Jack";
            //Dog.PrintName();
            //Dog.speak();
            //Pet Cat = new Cat();
            //Cat.Name = "Tom";
            //Cat.PrintName();
            //Cat.speak();
            Pet[] pets = new Pet[]{new Dog("Jack"),new Cat("Tom")};
            for (int i = 0; i < pets.Length;i++ ) {
                pets[i].speak();
             
            }
            Cat c = new Cat("Tom2");
            IClimbTree climb = (IClimbTree)c;
            c.catchMice();
            climb.climbTree();
            Dog a = new Dog("Jack1");
            Dog.ShowNum();

            Dog dog = new Dog("Tommy");
            dog.HowToFeed();



        }
    }
}