Book

public class Book {
    // private instance variable, not accessible from outside this class
        private String Name;
        private String Author;
        private double Price;
        private int qtyInStock;

    // Constructors for a new instance of
        public Book (String Name, String Author, double Price) {
            this.Name = Name;
            this.Author = Author;
            this.Price = Price;
        }

        public Book (String Name, String Author, double Price, int qtyInStock) {
            this.Name = Name;
            this.Author = Author;
            this.Price = Price;
            this.qtyInStock = qtyInStock;
        }

    // A public method for retrieving the Name, Author, Price and QtyInStock
        public String getName() {
            return Name;
        }

        public String getAuthor() {
            return Author;
        }

        public double getPrice() {
            return Price;
        }

        public int getQtyInStock() {
            return qtyInStock;
        }

    // Setter for instance variable Price and qtyInStock
        public void setPrice(int Price) {
            this.Price = Price;
        }

        public void setQtyInStock(int qtyInStock) {
            this.qtyInStock = qtyInStock;
        }

    // toString method
        public String toString() {
               return Name + " by " + Author.toString();
        }

        //toString() that returns "'book-name' by author-name (gender) at email".
        //(Take note that the Author's toString() method returns "author-name (gender) at email".)
}