日期:2014-05-18  浏览次数:20844 次

在看C#高级编程第二版,有个例子看不懂,请教一下
using   System;
namespace   MortimerPhone5Funny
{
public   class   Customer
{
public   string   GetFunnyString()
{
return   "Plain   ordinary   customer.Kaark! ";
}
}

public   class   Nevermore60Customer:Customer
{
public   new   string   GetFunnyString()
{
return   "Nervermore60.Nevermore! ";
}
}
public   class   MainEntryPoint
{
public   static   int   Main(string[]   args)
{
Customer   Cust1;
Nevermore60Customer   Cust2;
Cust1   =   new   Customer();
Console.WriteLine( "Customer   referencing   Customer: "+Cust1.GetFunnyString());

Cust1   =   new   Nevermore60Customer();
Console.WriteLine( "Customer   referencing   Nevermor60Customer: "+Cust1.GetFunnyString());

Cust2   =   new   Nevermore60Customer();
Console.WriteLine( "Nevermore60Customer   referencing: "+Cust2.GetFunnyString());
return   0;
}
}
}
***************************************************************************
Cust1   =   new   Customer();
Console.WriteLine( "Customer   referencing   Customer: "+Cust1.GetFunnyString());

Cust1   =   new   Nevermore60Customer();
Console.WriteLine( "Customer   referencing   Nevermor60Customer: "+Cust1.GetFunnyString());
这一段,Cust1先是声明为Customer的一个实例,然后声明为Nevermore60Customer的实例,在Nervermore60Customer中新的GetFunnyString()方法不是已经把基类中的方法隐藏了么,为什么还是输出基类方法的结果?


------解决方案--------------------
Customer Cust1;
Nevermore60Customer Cust2;
Cust1 = new Customer();
声明的时候,应该是声明了一个基类的对象
如果这样----
Nevermore60Customer Cust2 = new Nevermore60Customer();
(Customer )Cust2

然后再显示转换一下,你说他是调用哪个方法呢?
我只是说一下我的理解,请楼下继续