1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6  7 namespace _111111111111111111111111111 8 { 9     class Test10     {11         static void Main()12         {13             vehicle ve = new car(100);14             ve.move();15             Console.Read();16         }17     }18     public class vehicle19     {20         protected float speed=111111;21         public vehicle(float speed) { speed = this.speed+1; }22         public virtual void move()23         {24             Console.WriteLine("我的移动速度是：{0}", this.speed);25         }26     }27     public class car : vehicle28     {29         public float speed = 1;//-----子类在这里声明一个字段；就把父类的字段给“覆盖掉了”30         public car(float speed)//这里speed的值与base（speed）的值都被初始化为100了31             : base(speed)32         {33            speed = this.speed;//这里如果子类没有该字段，就会指向父类的字段（这里也可适用于其他的成员）34         }35         public override void move()36         {37             Console.WriteLine("我的运行速度是：{0}", this.speed);38         }39     }40 }