Book.java

public class Book {

    //Private Variables
    private int isbn;
    private String title;
    private String author;
    private double price;

    //GET isbn
    public int getISBN(){
        return this.isbn;
    }

    //SET isbn
    public void setISBN(int isbn){
        this.isbn = isbn;
    }

    //GET title
    public String getTitle(){
        return this.title;
    }

    //SET title
    public void setTitle(String title){
        this.title = title;
    }

    //GET author
    public String getAuthor(){
        return this.author;
    }

    //SET author
    public void setAuthor(String author){
        this.author = author;
    }

    //GET price
    public double getPrice(){
        return this.price;
    }

    //SET price
    public void setPrice(double price){
        this.price = price;
    }

    public Book() //default constructor Or parameterless constructor
    {
        this.isbn = 0000;
        this.title = "Unknown";
        this.author = "Unknown";
        this.price = 0000;
    }


    public Book(int isbn, String title, String author, double price)
    {
        this.isbn=isbn;
        this.title=title;
        this.author = author;
        this.price = price;
    }

    public void displayBook()
    {
        System.out.println("\n\n\t\tISBN: " + this.isbn + "\n\t\tTitle: " + this.title + "\n\t\tAuthor: " + this.author + "\n\t\tPrice: " +this.price+"\n");
    }


    public String toString(){
        return "\n\n\t\tISBN: " + this.isbn + "\n\t\tTitle: " + this.title + "\n\t\tAuthor: " + this.author + "\n\t\tPrice: " +this.price+"\n";

    }
}