C# 父类与子类的简单使用

来源：互联网发布：suse linux 网关配置编辑：程序博客网时间：2024/06/02 00:58
protected 子类可以访问父类
产生随机数：
Random r=new Random( );
int rand=r.Next(1,45); // 产生在1--44之间的随机数
//类的多态性//这个简单例子说明可以通过父类调用子类，把所有的子类都当做父类处理，写成通用的代码，再进行强制转换到子类处理namespace convert{    class Program    {        static void Main(string[] args)        {            Person [] people=new Person[10];            Random num = new Random( );            for (int i = 0; i < 10;i++ )            {                int rand = num.Next(1, 6);                switch(rand){                    case 1:                        people[i] = new Vivi();                        break;                    case 2:                        people[i] = new Ququ();                        break;                    case 3:                        people[i] = new Evil();                        break;                    case 4:                        people[i] = new Wea();                        break;                    case 5:                        people[i] = new Ewi();                        break;                    default:                        people[i] = new Person();                        break;                }            }            for (int i = 0; i < 10;i++ )            {                if (people[i] is Vivi){                    ((Vivi)people[i]).showvivi();                }                else if (people[i] is Ququ)                {                    ((Ququ)people[i]).showququ();                }else if(people[i] is Evil){                    ((Evil)people[i]).showevil();                }                else if (people[i] is Wea)                {                    ((Wea)people[i]).showwea();                }                else if (people[i] is Ewi)                {                    ((Ewi)people[i]).showpeewi();                }                    }                              Console.ReadKey();        }        // 父类与子类的关系  5个子类        public class Person{          public void showpeson()          {              Console.WriteLine("hello,i'm person");          }          }        public class Vivi:Person        {          public void showvivi()          {              Console.WriteLine("hello,i'm vivi");          }          }        public class Ququ : Person        {            public void showququ()            {                Console.WriteLine("hello,i'm Ququ");            }        }        public class Evil : Person        {            public void showevil()            {                Console.WriteLine("hello,i'm Evil");            }        }        public class Wea : Person        {            public void showwea()            {                Console.WriteLine("hello,i'm Wea");            }        }        public class Ewi : Person        {            public void showpeewi()            {                Console.WriteLine("hello,i'm ewi");            }        }    }}
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