Book.java

public class Book {
    private String title;
    private String author;

    public String getIsbn() {
        return isbn;
    }

    public void setIsbn(String isbn) {
        this.isbn = isbn;
    }

    private String isbn;
    private String genre;
    private boolean isBorrowed;

    public Book(String title, String author, String isbn, String genre) {
        this.title = title;
        this.author = author;
        this.isbn = isbn;
        this.genre = genre;
        this.isBorrowed = false;
    }

   
    public String getTitle() {
        return title;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    public boolean isBorrowed() {
        return isBorrowed;
    }

    @Override
    public String toString() {
        return title + " by " + author + " (ISBN: " + isbn + ")";
    }
}