static void Main(string[] args)
{
//使用多态中的抽象类实现简单工厂模式
Console.WriteLine("请输入需要的电脑品牌");
string brand = Console.ReadLine();
NoteBook nb = getNoteBook(brand);
nb.Say();
}
public static NoteBook getNoteBook(string brand)
{
NoteBook nb = null;
switch (brand)
{
case "dell":
nb = new Dell();
break;
case "lenovo":
nb = new Lenovo();
break;
}
return(nb);
}