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Library Management System in Java (Source Code)

import java.util.*;

class Book {
    int id;
    String title;
    String author;
    boolean isAvailable;

public Book(int id, String title, String author) {
        this.id = id;
        this.title = title;
        this.author = author;
        this.isAvailable = true;
    }

public void displayInfo() {
        System.out.println("ID: " + id + " | Title: " + title + " | Author: " + author + " | Available: " + (isAvailable ? "Yes" : "No"));
    }
}

class Library {
    private List<Book> books;
    private int nextId;

public Library() {
        books = new ArrayList<>();
        nextId = 1;
    }

public void addBook(String title, String author) {
        Book book = new Book(nextId++, title, author);
        books.add(book);
        System.out.println("Book added successfully!");
    }

public void removeBook(int id) {
        Book book = findBookById(id);
        if (book != null) {
            books.remove(book);
            System.out.println("Book removed successfully!");
        } else {
            System.out.println("Book not found!");
        }
    }

public void displayBooks() {
        if (books.isEmpty()) {
            System.out.println("No books available in the library.");
        } else {
            for (Book book : books) {
                book.displayInfo();
            }
        }
    }

public Book findBookById(int id) {
        for (Book book : books) {
            if (book.id == id) {
                return book;
            }
        }
        return null;
    }

public void borrowBook(int id) {
        Book book = findBookById(id);
        if (book != null && book.isAvailable) {
            book.isAvailable = false;
            System.out.println("You borrowed: " + book.title);
        } else {
            System.out.println("Book not available or already borrowed.");
        }
    }

public void returnBook(int id) {
        Book book = findBookById(id);
        if (book != null && !book.isAvailable) {
            book.isAvailable = true;
            System.out.println("You returned: " + book.title);
        } else {
            System.out.println("This book wasn't borrowed or doesn't exist.");
        }
    }
}

public class LibraryManagementSystem {

public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Library library = new Library();
        
        while (true) {
            System.out.println("\nLibrary Management System");
            System.out.println("1. Add Book");
            System.out.println("2. Remove Book");
            System.out.println("3. View Books");
            System.out.println("4. Borrow Book");
            System.out.println("5. Return Book");
            System.out.println("6. Exit");
            System.out.print("Enter your choice: ");
            
            int choice = sc.nextInt();
            sc.nextLine();  // Consume newline left by nextInt()

switch (choice) {
                case 1:
                    System.out.print("Enter Book Title: ");
                    String title = sc.nextLine();
                    System.out.print("Enter Book Author: ");
                    String author = sc.nextLine();
                    library.addBook(title, author);
                    break;

case 2:
                    System.out.print("Enter Book ID to Remove: ");
                    int removeId = sc.nextInt();
                    library.removeBook(removeId);
                    break;

case 3:
                    library.displayBooks();
                    break;

case 4:
                    System.out.print("Enter Book ID to Borrow: ");
                    int borrowId = sc.nextInt();
                    library.borrowBook(borrowId);
                    break;

case 5:
                    System.out.print("Enter Book ID to Return: ");
                    int returnId = sc.nextInt();
                    library.returnBook(returnId);
                    break;

case 6:
                    System.out.println("Exiting system.");
                    sc.close();
                    return;

default:
                    System.out.println("Invalid choice. Try again.");
            }
        }
    }
}

Explanation:

1. Book class: Represents a book with an ID, title, author, and availability status (isAvailable). It has a method to display book information.
2. Library class: Contains a list of books and methods for adding, removing, displaying, borrowing, and returning books.
3. LibraryManagementSystem class: The main class that serves as the user interface. It takes user input for various actions like adding, removing, or borrowing books.

Features:-

‣ Add Book: Adds a new book with a unique ID.
‣ Remove Book: Removes a book by its ID.
‣ View Books: Lists all books with their status.
‣ Borrow Book: Marks a book as borrowed.
‣ Return Book: Marks a borrowed book as returned.

Sample Usage:

1. Add Book: You input the title and author, and the book is added to the system.

2. Remove Book: You can remove a book by its ID.

3. View Books: Displays a list of all books with their availability.

4. Borrow/Return Book: Allows borrowing and returning of books by ID.

How to Run:

1. Save this code in a file called LibraryManagementSystem.java.

2. Compile the code using: javac LibraryManagementSystem.java.

3. Run the program using: java LibraryManagementSystem.

With this code, you can develop Library Management System in Java to fit your needs.

Library Management System in Java (Source Code)

Explanation:

Features:-

Sample Usage:

How to Run:

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