using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace 课本习题 { public class Animal { public Animal() { Console.WriteLine("基类构造函数:Hello,Animal"); } public void Eat() { Console .WriteLine("扩充类方法:Eating"); } } public class Cat:Animal { public Cat() { Console.WriteLine("扩充类构造函数:Hello,Cat"); } public void Walk() { Console .WriteLine("扩充类方法:Walking"); } } class Program { static void Main(string[] args) { Cat cat=new Cat (); cat.Eat(); cat.Walk(); Console .ReadLine(); } } }