static void Main(string[] args)
{
Console.WriteLine("请输入你喜欢的笔记本电脑名称：");
string brand = Console.ReadLine();
NoteBook nb = CreateNoteBook(brand);
nb.Show();
Console.ReadKey();
}
//创建笔记本的工厂
public static NoteBook CreateNoteBook(string brand)
{
NoteBook nb = null;
switch (brand)
{
case "lenovo":
nb = new Lenovo();
break;
}
return(nb);
}