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

namespace MethodOverrideByNew
{
  public enum Genders { 
    Female=0,
    Male=1
  }
  public class Person {
    protected string _name;
    protected int _age;
    protected Genders _gender;
    /// <summary>
    /// 父类构造函数
    /// </summary>
    public Person() {
      this._name = "DefaultName";
      this._age = 23;
      this._gender = Genders.Male;
    }
    /// <summary>
    /// 定义虚函数IntroduceMyself()
    /// </summary>
    public virtual void IntroduceMyself() {
      System.Console.WriteLine("Person.IntroduceMyself()");
    }
    /// <summary>
    /// 定义虚函数PrintName()
    /// </summary>
    public virtual void PrintName() {
      System.Console.WriteLine("Person.PrintName()");
    }
  }
  public class ChinesePerson :Person{
    /// <summary>
    /// 子类构造函数，指明从父类无参构造函数调用起
    /// </summary>
    public ChinesePerson() :base(){
      this._name = "DefaultChineseName";
    }
    /// <summary>
    /// 覆盖父类方法IntroduceMyself，使用new关键字修饰虚函数
    /// </summary>
    public new void IntroduceMyself() {
      System.Console.WriteLine("ChinesePerson.IntroduceMyself()");
    }
    /// <summary>
    /// 重载父类方法PrintName，使用override关键字修饰虚函数
    /// </summary>
    public override void PrintName(){
      System.Console.WriteLine("ChinesePerson.PrintName()");      
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      //定义两个对象，一个父类对象，一个子类对象
      Person aPerson = new ChinesePerson();
      ChinesePerson cnPerson = new ChinesePerson();
      //调用覆盖的方法，父类对象不能调用子类覆盖过的方法，只能调用自身的虚函数方法
      aPerson.IntroduceMyself();   
      cnPerson.IntroduceMyself();
      //调用重载方法，父类对象和子类对象都可以调用子类重载过后的方法
      aPerson.PrintName();
      cnPerson.PrintName();

      System.Console.ReadLine();
    }
  }
}