C# 抽象类

 1     class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             //抽象类不允许创建对象
 6             Animal a = new Cat(); //new Dog();
 7             a.Bark();
 8             Console.ReadKey();
 9         }
10     }
11 
12     abstract class Animal
13     {
14         public abstract void Bark(); 
15     }
16 
17     class Dog : Animal
18     {
19 
20         public override void Bark()
21         {
22             Console.WriteLine("狗狗旺旺的叫");
23         }
24     }
25 
26     class Cat : Animal
27     {
28         public override void Bark()
29         {
30             Console.WriteLine("猫咪喵喵的叫");
31         }
32     }