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. 
• Public member methods
  • setDescription() mutator & getDescription() accessor 
  • 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.

• 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 
• Public member methods
  • getCustomerName() accessor 
  • getDate() accessor 
  • 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() 
    • Returns quantity of all items in cart. Has no parameters.
  • getCostOfCart() 
    • 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

      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.

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

      • printMenu()
        • Prints the following menu of options to manipulate the shopping cart. 
      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. 

      Step 5: Implement the menu options

      Step 5a: In main(), call printMenu() and prompt for the user's choice of menu options. Each option is represented by a single character.

      If an invalid character is entered, continue to prompt for a valid choice. When a valid option is entered, execute the option by calling executeMenu(). Then, print the menu and prompt for a new option. Continue until the user enters 'q'. 

      Hint: Implement Quit before implementing other options.

      Step 5b: Implement "Output shopping cart" menu option in executeMenu(). 

      Step 5c: Implement "Output items' descriptions" menu option in executeMenu(). 

      Step 5d: Implement "Add item to cart" menu option in executeMenu(). 

      Ex:

      ADD ITEM TO CART Enter the item name: Nike Romaleos Enter the item description: Volt color, Weightlifting shoes Enter the item price: 189 Enter the item quantity: 2

      Step 5e: Implement "Remove item from cart" menu option in executeMenu(). 

      Ex:

      REMOVE ITEM FROM CART Enter name of item to remove: Chocolate Chips

      Step 5f: Implement "Change item quantity" menu option in executeMenu(). 

      Hint: Make new ItemToPurchase object and use ItemToPurchase modifiers before using modifyItem() method.