Book.java

public class Book {
    private String bookID;
    private String title;
    private String author;
    private String isbn;
    private boolean available;

    public Book(String bookID, String title, String author, String isbn) {
        this.bookID = bookID;
        this.title = title;
        this.author = author;
        this.isbn = isbn;
        this.available = true; // Initially, the book is available
    }

    // Getters and Setters
    public String getBookID() { return bookID; }
    public String getTitle() { return title; }
    public String getAuthor() { return author; }
    public String getIsbn() { return isbn; }
    public boolean isAvailable() { return available; }

    public void setAvailable(boolean available) { this.available = available; }

    @Override
    public String toString() {
        return "Book ID: " + bookID + "\nTitle: " + title + "\nAuthor: " + author + "\nISBN: " + isbn + "\nAvailable: " + (available ? "Yes" : "No");
    }
}