Library Management System — Java project.

Student: Kian Dehghani

A console-based Library Management System that supports borrowing, returning, searching and reporting on books, DVDs and magazines. Three user roles — Student, Teacher and Admin — share an inheritance hierarchy with User, and item types share an inheritance hierarchy with Item. Data persists to CSV files.

Class diagram (Deliverable 1):

src/main/java/com/library
  domain/      Item, Book, DVD, Magazine, User, Student, Teacher, Admin, Library, ItemStatus
  service/     CSVService, BorrowingService, SortingService
  util/        Constants, Validation, LibraryException
  interfaces/  Reportable
  Main.java
src/main/resources
  books.csv, users.csv
src/test/java/com/library
  ... JUnit 5 tests for domain, service and util

mvn compile
mvn test
mvn exec:java -Dexec.mainClass=com.library.Main

After launch the system loads books.csv and users.csv and prints a menu:

1) Search by title
2) Borrow item
3) Return item
4) Report
5) Backup to CSV
6) List items sorted by title
0) Quit

• Students may borrow up to 5 books and only books.
• Teachers may borrow up to 10 items of any type.
• Admins may not borrow; they generate reports and trigger CSV backup.

• ISBN must be exactly 13 digits.
• User IDs must start with an uppercase letter and contain only uppercase letters and digits (length ≥ 3).