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>
    /// 父類構造函數(shù)
    /// </summary>
    public Person() {
      this._name = "DefaultName";
      this._age = 23;
      this._gender = Genders.Male;
    }
    /// <summary>
    /// 定義虛函數(shù)IntroduceMyself()
    /// </summary>
    public virtual void IntroduceMyself() {
      System.Console.WriteLine("Person.IntroduceMyself()");
    }
    /// <summary>
    /// 定義虛函數(shù)PrintName()
    /// </summary>
    public virtual void PrintName() {
      System.Console.WriteLine("Person.PrintName()");
    }
  }
  public class ChinesePerson :Person{
    /// <summary>
    /// 子類構造函數(shù)，指明從父類無參構造函數(shù)調用起
    /// </summary>
    public ChinesePerson() :base(){
      this._name = "DefaultChineseName";
    }
    /// <summary>
    /// 覆蓋父類方法IntroduceMyself，使用new關鍵字修飾虛函數(shù)
    /// </summary>
    public new void IntroduceMyself() {
      System.Console.WriteLine("ChinesePerson.IntroduceMyself()");
    }
    /// <summary>
    /// 重載父類方法PrintName，使用override關鍵字修飾虛函數(shù)
    /// </summary>
    public override void PrintName(){
      System.Console.WriteLine("ChinesePerson.PrintName()");      
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      //定義兩個對象，一個父類對象，一個子類對象
      Person aPerson = new ChinesePerson();
      ChinesePerson cnPerson = new ChinesePerson();
      //調用覆蓋的方法，父類對象不能調用子類覆蓋過的方法，只能調用自身的虛函數(shù)方法
      aPerson.IntroduceMyself();   
      cnPerson.IntroduceMyself();
      //調用重載方法，父類對象和子類對象都可以調用子類重載過后的方法
      aPerson.PrintName();
      cnPerson.PrintName();

      System.Console.ReadLine();
    }
  }
}