FileOperator
name: char[]books: Listprice: floatpublishInfo: char[]state:bool
BookKind
fileReader: FileReaderfileWriter: FileWriterbookBuffer: ListrecordBuffer: List
Library
userId: intbookId: intcount: int
AdminOperateRecord
Book
Admin
User(Library lib):Login()name: char[]id: intrecords: Listfee: floatQueryBook(int bookId)//查询书籍位置和具体信息isHalted: bool//是否被冻结，欠款会被冻结，缴纳所以欠款就会解冻BorrowBook(Book book):boolContinueBorrowBook(Book book):boolReturnBook(Book book):boolPayFees(float fee):bool//学生交钱
User
userId: intbookId: intCount: intdate: Date
UserOperateRecord
[Condition]
Opt | Alt | Loop
Date
Record
