public class Book implements ItemElement {
private int price;
private String isbnNumber;
public Book(int cost, String isbn){
this.price=cost;
this.isbnNumber=isbn;
}
public int getPrice() {
return price;
}
public String getIsbnNumber() {
return isbnNumber;
}
@Override
public int accept(ShoppingCartVisitor visitor) {
return visitor.visit(this);
}
}