using System;

namespace ConsoleApplication1
{
    class People
    {
        int age = 8;

        public int Age {
            get { return age; }
        }
    }
    /// <summary>
    /// Student 类里写的有点多余
    /// </summary>
    class Student : People
    {
        int age = 9;

        public int Age
        {
            get { return age; }
        }       
    }
    class Program
    {
        static void Main(string[] args)
        {
            //父类引用子类对象（多态）
            People p = new Student();
            Console.WriteLine(string.Format("age={0}", p.Age));

            Student s = new Student();
            Console.WriteLine(string.Format("age={0}",s.Age));
        }
    }
}

age=8
age=9
请按任意键继续. . .

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