Object-Oriented Design - Java Concepts - page 752

@param quantity the quantity of the product
*/
public void add(Product aProduct, int quantity)
{
}
/**
Formats the invoice.
@return the formatted invoice
*/
public String format()
{
}
}
/**
Describes a quantity of an article to purchase and its price.
*/
public class LineItem
{
/**
Computes the total cost of this line item.
@return the total price
*/
public double getTotalPrice()
{
}
/**
Formats this item.
@return a formatted string of this line item
*/
public String format()
{
}
}
/**
Describes a product with a description and a price.
*/
public class Product
{
/**
Gets the product description.
@return the description
*/