static void Main(string[] args)
{
Console.WriteLine("****************欢迎登陆图书馆管理系统******************");
BookKu.GetInstance();
PersonKu ps = new PersonKu();
Console.WriteLine("请对您的身份进行选择：\t1.管理员\t2.借阅者");
while (true)
{
string k = Console.ReadLine();
switch (k)
{
case "1":
Manager ma = new Manager();
break;
case "2":
Borrower bor = new Borrower();
break;
default:
Console.WriteLine("您的输入有误！！！重新输入：");
break;
}
break;
}
Console.ReadKey();
}
public static BookKu GetInstance()
{
if (bk == null)
{
bk = new BookKu();
}
return(bk);
}