Object Oriented Analysis and Design:Library System

We will make the assumption that the collection includes just books.When a book is added to the collection,Its the title, the author’s name, and a unique ID will be recorded.
When it is added to the collection, a book is given a unique identifier by the clerk.
This ID is based on some standard system of classification.
Relatively,we may remove books from the collection for some reasons

When issue a book to a member,a member must identify himself to a clerk and hand over the books.The clerk will register the books as lending status.Any number of books may be checked out in a single transaction.

If a member return a book,he should gives the book to a clerk, who submits the information to the system, which marks the book as ‘Lending status’. If there is a hold on the book, the system should remind the clerk to set the book aside so that the hold can be processed.

When a user wants to put a hold, he/she supplies the clerk with the book’s ID, the user’s ID, and the number of days after which the book is not needed. The clerk then adds the user to a list of users who wish to borrow the book. If the book is not checked out, a hold cannot be placed. To remove a hold,the user provides the book’s ID and the user’s ID.

Customers may walk in and request that several of the books they have checked out be renewed (re-issued). The system must display the relevant books, allow the user to make a selection, and inform the user of the result.

Customers who had placed a hold on a book are notified when the book is returned. This process is done once at the end of each day. The clerk enters the ID for each book that was set aside, and the system returns the name and phone number of the user who is next in line to get the book

Borrow：

Return：

Bespoke：

Extend the time: