1添加类Animal.cs

using System;

using static System.Console;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace 录音1

{

public abstract class Animal

{

protected string name;

public string name

{

get { return name; }

set { name = value; }

}

public Animal()

{

name = "没有名字";

}

public Animal(string newName)

{

name = newName;

}

public void Feed() => WriteLine($"{name}已被馈赠");

}

}

2添加类Cow.cs

using System;

using static System.Console;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace 录音1

{

public class Cow:Animal

{

public void Milk() => WriteLine($"{name}已被挤奶");

public Cow(string newName) : base(newName) { }

}

}

3添加类Chicken.cs

using System;

using static System.Console;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace 录音1

{

public class Chicken:Animal

{

public void LayEgg() => WriteLine($"{name}下了一个蛋");

public Chicken(string newName) : base(newName) { }

}

}