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Choose two of the essential classes in your design of the library system and briefly explain why they are essential. For each of these two classes, say what public methods those classes should have. Each method should have a very brief description of its function.

Choose two of the essential classes in your design of the library system and briefly explain why they are essential. For each of these two classes, say what public methods those classes should have. Each method should have a very brief description of its function.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Choose two of the essential classes in your design of the library system and briefly explain why they are essential.

For each of these two classes, say what public methods those classes should have. Each method should have a very brief description of its function.

A university library has a stock of books and video DVDS which can be lent to lecturers, postgraduate students and undergraduate students. Books can be lent to lecturers for up to eight weeks, to postgraduate students for four weeks and to undergraduate students for two weeks. DVDS can be lent to lecturers for up to four weeks, to postgraduate students for two weeks and to undergraduate students for one week. A lecturer who is late returning an item is fined €1 per day, postgraduate students are fined 50c per day and undergraduate students are fined 25c. The library wants a software system to be able to monitor the loans and the fines. You are asked to produce such a system using an object oriented design. Fill up the table below to indicate which classes are important to the design. For example, if you think a Book class would be essential in a good 00 design, then put it in the Essential column. If it is non essential, put it in the Non Essential column. Note that this will be a relatively basic implementation. We just want a design that will allow the library to record details about the Books and DVDS which are borrowed and to whom and which fines are due. Hint: the "Essential" column means that any reasonable design would include such a class. The "Non-Essential" column means that any reasonable design would not include such a class.
Transcribed Image Text:A university library has a stock of books and video DVDS which can be lent to lecturers, postgraduate students and undergraduate students. Books can be lent to lecturers for up to eight weeks, to postgraduate students for four weeks and to undergraduate students for two weeks. DVDS can be lent to lecturers for up to four weeks, to postgraduate students for two weeks and to undergraduate students for one week. A lecturer who is late returning an item is fined €1 per day, postgraduate students are fined 50c per day and undergraduate students are fined 25c. The library wants a software system to be able to monitor the loans and the fines. You are asked to produce such a system using an object oriented design. Fill up the table below to indicate which classes are important to the design. For example, if you think a Book class would be essential in a good 00 design, then put it in the Essential column. If it is non essential, put it in the Non Essential column. Note that this will be a relatively basic implementation. We just want a design that will allow the library to record details about the Books and DVDS which are borrowed and to whom and which fines are due. Hint: the "Essential" column means that any reasonable design would include such a class. The "Non-Essential" column means that any reasonable design would not include such a class.
Essential NonEssential IDCard LateFee Fine Loan StudyRoom Returns Euro Lecturer PostGraduate Collection Reference Librarian Вook DVD Libraryltem Shelf UnderGraduate Borrower
Transcribed Image Text:Essential NonEssential IDCard LateFee Fine Loan StudyRoom Returns Euro Lecturer PostGraduate Collection Reference Librarian Вook DVD Libraryltem Shelf UnderGraduate Borrower
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