//与java不同，c#不允许使用对象实例调用静态方法，让我惊讶啊！！ //c++可不这样 using System;using System.Collections.Generic;using System.Text; namespace __5{    //class Program    //{    //    static void Main(string[] args)    //    {     //    }    //}     abstract public class person    {        string name;        string ssn;        int age;        float salary;         public person(string name, string ssn, int age, float sal)        {            this.name = name;            this.ssn = ssn;            this.age = age;            this.salary = sal;        }         private string getssn()        //??        {            return ssn;        }         protected int getage()        {            return age;        }        internal float getsalary()        {            return salary;        }        string getname()        {            return name;        }         protected static string  getbloodcolor()              //静态方法        {            return "red";        }        static int getnumberofeyes()        {            return 2;        }         public override string ToString()        {            return name;        }        public override int GetHashCode()        {            //return base.GetHashCode();            return 12222;        }        public sealed override bool Equals(object obj)        {            //return base.Equals(obj);            person p = obj as person;            if (p == null)                return false;            return this.name.Equals(p.getname());        }        public virtual void calcinvestments()        {            Console.WriteLine("person funds");        }         public virtual void calcdebt()        {            Console.WriteLine("person debt");        }        public abstract void work();           }     public class man : person    {        public man(string name, string ssn, int age, float sal) : base(name, ssn, age, sal) { }         public override void work()        {            Console.WriteLine("works like a dog");        }        public override void calcinvestments()        {            //base.calcinvestments();            Console.WriteLine("man funds");        }        public new void calcdebt()        {            Console.WriteLine("man debt");        }         public static void Main(string[] agrs)        {            man m = new man("jack","12345678",23,40000f);            //Console.WriteLine(m.getbloodcolor());           //与java不同，c#不允许使用对象实例调用静态方法             //Console.WriteLine(m.getnumberofeyes());        //无访问权限            //Console.WriteLine(m.getssn());            //Console.WriteLine(m.getname());             Console.WriteLine(m.getsalary());            Console.WriteLine(m.getage());             m.calcinvestments();             person p = m as person;            p.calcinvestments();            Console.WriteLine("----");            ((person)m).calcinvestments();             m.calcdebt();            p.calcdebt();            Console.WriteLine("----");            ((person)m).calcdebt();        }    }}

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