Book.java

public class Book 
{
    
    private String id;
    private String title;
    private String author;
    private String isbn;
    private boolean available;
    
    public  Book(String id, String title, String author, String isbn, boolean available)
    {
        this.id = id;
        this.title = title;
        this.author = author;
        this.isbn = isbn;
        this.available = available;
    }
    
    // Getters and Setters
    public String getId() { 
        return id; 
    }
    
    public void setId(String id) { 
        this.id = id; 
    }
    
    public String getTitle() { 
        return title; 
    }
    
    public void setTitle(String title) { 
        this.title = title; 
    }
    
    public String getAuthor() { 
        return author; 
    }
    
    public void setAuthor(String author) { 
        this.author = author; 
    }
    
    public String getIsbn() { 
        return isbn; 
    }
    
    public void setIsbn(String isbn) { 
        this.isbn = isbn; 
    }
    
    public boolean isAvailable() { 
        return available; 
    }
    
    public void setAvailable(boolean available) { 
        this.available = available; 
    }
    
    @Override
    public String toString() {
        return String.format("Book{id='%s', title='%s', author='%s', isbn='%s', available=%s}", 
                           id, title, author, isbn, available);
    }
}