using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//类和对象、构造函数、方法、访问修饰符
namespace T4
{
    /// <summary>
    /// Person类
    /// </summary>
    class Person
    {
        /// <summary>
        /// Person类的默认构造函数
        /// </summary>
        public Person()
        {
            Console.WriteLine("这个是Person类的默认构造函数.");
        }
        public Person(string name)
        {
            Console.WriteLine("这个是Person类的单参构造函数：" + name + ".");
        }
        //以下为Person类的方法
        public void Eating()
        {
            Console.WriteLine("person吃饭.");
        }
        public void Walking()
        {
            Console.WriteLine("person走路.");
        }
        private void Sleep()//访问级别为private所以派生类的实例无法访问
        {
            Console.WriteLine("person睡觉.");
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//类的继承、构造函数的继承、new关键字的用法、this和base关键字的作用
namespace T4
{
    /// <summary>
    /// Children类，继承Person类
    /// </summary>
    class Children : Person
    {
        /// <summary>
        /// Children类的默认构造函数
        /// </summary>
        public Children()
            : base()
        { 
        }
        /// <summary>
        /// Children类的单参构造函数
        /// </summary>
        /// <param name="name">姓名</param>
        public Children(string name):this(name,15)
        {
            Console.WriteLine("这个是Children类的单参构造函数：" + name + ".");
        }
        /// <summary>
        /// Children类的双参构造函数
        /// </summary>
        /// <param name="name">姓名</param>
        /// <param name="age">年龄</param>
        public Children(string name, int age)
        {
            Console.WriteLine("这个是Children类的双参构造函数.");
        }
        /// <summary>
        /// 使用new关键字隐藏基类的Eating()方法
        /// </summary>
        new public void Eating()
        {
            //base代表基类，即Person类
            base.Eating();
        }
        /// <summary>
        /// 使用new关键字隐藏基类的Walking()方法
        /// </summary>
        new public void Walking()
        {
            //this代表当前类，即Children类
            this.Eating();
            Console.WriteLine("这个Children走路了.");
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace T4
{
    class Program
    {
        static void Main(string[] args)
        {
            //Children a = new Children();
            //Children b = new Children("Mary");
            //a.Eating();
            //a.Walking();
            //b.Eating();
            //b.Walking();
            
            Person p = new Person("Mary");
            p.Walking();

            Console.WriteLine("----------------------------------");

            Children b = new Children("Mary");
            //b.Walking();
            b.Eating();

            Console.Read();
        }
    }
}