📚 Java OOP Practice - Library Management System

This is a Java practice project that simulates a library management system using Object-Oriented Programming (OOP). It is intended to be completed in ~120 minutes as a practice assessment.

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To start the assessment create a branch or clone the repo...Don't push to main

⏱ Duration

Target Time: 120 minutes
Focus Areas: Classes, Inheritance, Abstraction, Encapsulation, Polymorphism

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✅ Objective

Build a console-based library system that allows users to:

• Add books to the system
• Register members
• Borrow and return books
• Track available and borrowed books
• Display member borrowing history

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🧱 Key Requirements

• Use ArrayList to store books and members in memory
• Use Scanner for CLI input
• Focus on clean class design and object interaction

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🧩 Classes

📖 Abstract Class: LibraryItem

• Fields:
  • String id
  • String title
  • boolean isAvailable
• Abstract Method: void displayInfo()
• Methods:
  • getId(), getTitle(), isAvailable(), setAvailable(boolean)

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📗 Class: Book (extends LibraryItem)

• Extra Field: String author
• Implements displayInfo() to print book info

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👤 Class: Member

• Fields:
  • String memberId
  • String name
  • ArrayList<LibraryItem> borrowedItems
• Methods:
  • borrowItem(LibraryItem item)
  • returnItem(LibraryItem item)
  • displayBorrowedItems()

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🏛️ Class: LibraryService

• Stores ArrayList<Book> books and ArrayList<Member> members
• Methods:
  • addBook(Book book)
  • registerMember(Member member)
  • borrowBook(String memberId, String bookId)
  • returnBook(String memberId, String bookId)
  • listAvailableBooks()
  • listBorrowedBooksByMember(String memberId)

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🖥️ Class: Main

Console menu to interact with the system:

===== Library Menu =====
1. Add Book
2. Register Member
3. Borrow Book
4. Return Book
5. View Available Books
6. View Borrowed Books by Member
7. Exit

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Example workflow

Add Book Enter title: Java 101 Enter author: Jane Doe

Register Member Enter name: Alex

Borrow Book Enter member ID: M001 Enter book ID: B001

View Available Books [Shows remaining books only]

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Project structure

src/
├── Main.java
├── model/
│   ├── LibraryItem.java
│   ├── Book.java
│   └── Member.java
├── service/
│   └── LibraryService.java