in this exercise, you are going to practice the MVC design pattern.

You are provided a program that simulates a shopping cart.

Your task is to rewrite this program so that it is implemented with the MVC $($model view

controller$)$ pattern.

Your program should contain at least four classes:

$$ A view class that can display the shopping cart interface to user; it can also set data to the

textbox;

$$ A model class that simulates the internal behavior of a shopping cart, the number of items in

the shopping cart should be maintained by the model class.

$$ A controller class that connects view and model. It can interpret the action performed by the

user and call methods of view or controller to perform specific operations.

$$ An application class that can contains the main function to test this program.

Submissions:

$(1)$ Upload all source code files $(.$java files$).$

$(2)$ Upload $4$ screenshots of the output of running your program showing

a$.$ Empty shopping cart

b$.$ One item is added to the shopping cart

c$.$ Two items are added to the shopping cart

d$.$ One item is removed from the shopping cart