IN JAVA PLEASE $-3.$java Files required, named ShoppingCartManager, ShoppingCart, and ItemToPurchase.

$30\mathrm{.}14$ LAB$*$: Program: Online shopping cart $($Part $2)$

Note: Creating multiple Scanner objects for the same input stream yields unexpected behavior. Thus, as good practice is to use a single Scanner object for reading input from System.in$.$ That Scanner object can be passed as an argument to any methods that read input.

This program extends the earlier "Online shopping cart $($Part $1)"$ program. $($Consider first saving your earlier program$).$

Step $1$: Extend the ItemToPurchase class per the following specifications:

Private fields

string itemDescription $-$ Initialized in default constructor to "none"

Parameterized constructor to assign item name, item description, item price, and item quantity. $(1$ pt$)$

Public member methods

setDescription$()$ mutator & getDescription$()$ accessor $(2$ pts$)$

printItemCost$()-$ Outputs the item name followed by the quantity, price, and subtotal

printItemDescription$()-$ Outputs the item name and description

Ex$.$ of PrintItemCost$()$ output:

Bottled Water $10$ @ $$1=$ $$10$

Ex$.$ of PrintItemDescription$()$ output:

Bottled Water: Deer Park, $12$ oz$.$

Step $2$: Create two new files:

ShoppingCart.java $-$ Class definition

ShoppingCartManager.java $-$ Contains main$()$ method

Build the ShoppingCart class with the following specifications.

Private fields

String customerName $-$ Initialized in default constructor to "none"

String currentDate $-$ Initialized in default constructor to "January $1,2016"$

ArrayList cartItems

Default constructor

Parameterized constructor which takes the customer name and date as parameters $(1$ pt$)$

Public member methods

getCustomerName$()$ accessor $(1$ pt$)$

getDate$()$ accessor $(1$ pt$)$

addItem$()$

Adds an item to cartItems array. Has a parameter of type ItemToPurchase. Does not return anything.

removeItem$()$

Removes item from cartItems array. Has a string $($an item's name$)$ parameter. Does not return anything.

If item name cannot be found, output a message: Item not found in cart. Nothing removed.

modifyItem$()$

Modifies an item's description, price, and$/$or quantity. Has a parameter of type ItemToPurchase. Does not return anything.

If item can be found $($by name$)$ in cart, check if parameter has default values for description, price, and quantity. If not, modify item in cart.

If item cannot be found $($by name$)$ in cart, output a message: Item not found in cart. Nothing modified.

getNumItemsInCart$()(2$ pts$)$

Returns quantity of all items in cart. Has no parameters.

getCostOfCart$()(2$ pts$)$

Determines and returns the total cost of items in cart. Has no parameters.

printTotal$()$

Outputs total of objects in cart.

If cart is empty, output a message: SHOPPING CART IS EMPTY

printDescriptions$()$

Outputs each item's description.

If cart is empty, output a message: SHOPPING CART IS EMPTY

Ex$.$ of printTotal$()$ output:

John Doe's Shopping Cart $-$ February $1,2016$

Number of Items: $8$

Nike Romaleos $2$ @ $$189=$ $$378$

Chocolate Chips $5$ @ $$3=$ $$15$

Powerbeats $2$ Headphones $1$ @ $$128=$ $$128$

Total: $$521$

Ex$.$ of printDescriptions$()$ output:

John Doe's Shopping Cart $-$ February $1,2016$

Item Descriptions

Nike Romaleos: Volt color, Weightlifting shoes

Chocolate Chips: Semi$-$sweet

Powerbeats $2$ Headphones: Bluetooth headphones

Step $3$: In main$(),$ prompt the user for a customer's name and today's date. Output the name and date. Create an object of type ShoppingCart. $(1$ pt$)$

Ex:

Enter customer's name:

John Doe

Enter today's date:

February $1,2016$

Customer name: John Doe

Today's date: February $1,2016$

Step $4$: Implement the following menu functions in the ShoppingCartManager class

printMenu$()$

Prints the following menu of options to manipulate the shopping cart. $(1$ pt$)$

MENU

a $-$ Add item to cart

d $-$ Remove item from cart

c $-$ Change item quantity

i $-$ Output items' descriptions

o $-$ Output shopping cart

q $-$ Quit

executeMenu$()$

Takes $3$ parameters: a character representing the user's choice, a shopping cart, and a Scanner object. Performs the menu options described below in step $5,$ according to the user's choice. $(1$ pt$)$