c#中接口、抽象类、继承综合小练习

 namespace Test
 {
     class Program
     {
         static void Main(string[] args)
         {
             //作业:橡皮rubber鸭子、木wood鸭子、真实的鸭子realduck。
             //三个鸭子都会游泳，而橡皮鸭子和真实的鸭子都会叫，
             //只是叫声不一样，橡皮鸭子“唧唧”叫，真实地鸭子“嘎嘎”叫，木鸭子不会叫.

             Duck dk = new RealDuck();
             dk.Swim();
             IBark ib = new RealDuck();
             ib.Bark();
             Console.ReadKey();
         }
     }
     //为抽象类
     public abstract class Duck
     {
         public abstract void Swim();
     }
     //接口
     public interface IBark
     {
         void Bark();
     }

     public class RealDuck : Duck, IBark
     {
         public void Bark()
         {
             Console.WriteLine("真的鸭子嘎嘎叫");
         }

         public override void Swim()
         {
             Console.WriteLine("真的鸭子会游泳");
         }
     }

     public class MuDuck : Duck
     {
         public override void Swim()
         {
             Console.WriteLine("木头鸭子也会游泳");
         }
     }

     public class XPDuck : Duck, IBark
     {
         public void Bark()
         {
             Console.WriteLine("橡皮鸭子唧唧叫");
         }

         public override void Swim()
         {
             Console.WriteLine("橡皮鸭子也会游泳");
         }
     }
 }