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Exercise

The following UML diagram shows the relationship between a class called PizzaOrder and a class called Pizza:

The word “in” means the parameter is used to deliver data to the method.

The Pizza class contains information about a specific pizza. The variables of pepperoni, sausage, and mushrooms are booleans that indicate whether or not these toppings are present on the pizza. The size variable is a character of value 's', 'm', or 'l' to indicate small, medium, or large. There is also a Pizza constructor that initializes all of these values. The getsize() method returns the size of the pizza and the getNumToppings() method returns a number from 0-3 depending on what toppings are present (e.g., if the pizza has pepperoni and mushrooms, it would be 2).

The PizzaOrder class contains an array of Pizza ’s. There is a method to add a new pizza to the array (which increments numPizzas) and also a method to calculate the cost of the entire order. A small pizza costs $8, a medium pizza is $10, and a large pizza costs $12. Each topping adds $1 to the pizza.

The arrow connecting PizzaOrder to Pizza indicates that the PizzaOrder class has a reference to the Pizza class, but not vice versa. The solid diamond on the PizzaOrder class is a UML construct that indicates that the PizzaOrder class has a collection of the Pizza class. There may be many (*) Pizza’s for a single (one) PizzaOrder.

Given this information, write Java code that implements the Pizza and PizzaOrder classes. Also, write a test main function that creates a pizza order, adds several pizzas to it, and outputs the cost of the order.