黑马程序员---抽象类例子

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  从学生，老师，校长类中抽象出人的类，学生和老师都有收作业的方法，但是校长不会收作业
        static void Main(string[] args)
        {
            Student stu = new Student();
            Teacher tea = new Teacher();
            stu.CollectHomeWork();
            tea.HandHomework();
            Console.ReadKey();
        }
     
        // Peron类
        public abstract class Person
        {
            private string name;

            public string Name
            {
                get { return name; }
                set { name = value; }
            }
            private string sex;

            public string Sex
            {
                get { return sex; }
                set { sex = value; }
            }

            public Person() { }
            public Person(string name, string sex)
            {
                this.name = name;
                this.sex = sex;
            }
        }
        //新建交作业的方法

        public void CollectHomeWork() { }

        // 新建老师类和学生类继承自Person类
        class Student : Person
        {
            public Student() { }
            public void CollectHomeWork()
            {
                Console.WriteLine("收作业");
            }
            public Student(string name, string sex)
                : base(name, sex) { }
        }

        class Teacher : Person
        {
            public Teacher() { }
            public void HandHomework()   // 交作业的方法
            {
                Console.WriteLine("该交作业了");
            }
            public Teacher(string name, string sex)
                : base(name, sex) { }
        }
        // 新建校长类继承Person类
        class SchoolMaster : Person
        {
            public SchoolMaster(string name, string sex)
                : base(name, sex) { }
        }

 

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