Question

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

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 itemquantity (default values of 0).

            Public instance 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.

2. Create two new files

• ShoppingCart.java - Class definition
• ShoppingCartManager.java - Contains main() method

Build the ShoppingCart class with the following specifications. Note: Some can be method stubs (empty methods) initially, to be completed in later steps.

            Private fields

• String customerName - Initialized in default constructor to "none"
• String currentDate - Initialized in default constructor to"January 1, 2020"
• ArrayList cartItems – where each item is of type ItemToPurchase

Public member methods

• Default constructor
• Parameterized constructor which takes the customer name and date as parameters
  • getCustomerName() accessor
  • getDate() accessor

addItem()     

                                           

                   Adds an item to cartItems array. Has parameter 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 this message: Item not found in cart. Nothing removed.

              modifyItem()

• Modifies an item's description, price, and/or quantity. Has parameter    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 this 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 this message: SHOPPING CART IS EMPTY

Example of PrintTotal()output:

John Doe's Shopping Cart - February 1, 2020

Number of Items: 8

Nike Romaleos 2 @$189 = $378

               Chocolate Chips 5 @ $3 = $15

Powerbeats 2 Headphones 1 @ $128 = $128

Total: $521

           printDescription()

• Outputs each item’s description.

                Example of printDescription()output:

John Doe's Shopping Cart - February 1, 2020

Item Descriptions

Nike Romaleos: Volt color, Weightlifting shoes Chocolate Chips: Semi-sweet

Powerbeats 2 Headphones: Bluetooth headphones

3. In the file ShoppingCartManager.java, have the main method prompt the user for a customer's name and today's date.

• Output the name and date.
• Create an object of type ShoppingCart.

              Output Example:

Enter Customer's Name: John Doe

Enter Today's Date:

February 1, 2020

Customer Name: John Doe

Today's Date: February 1, 2020

4. Implement the printMenu() method in ShoppingCartManager.java. printMenu() has a ShoppingCart parameter, and outputs a menu of options to manipulate the shopping cart. Each option is represented by a single character. Build and output the menu within the method
   • If there is an invalid character is entered, continue to prompt for a valid choice. Hint: Implement Quit before implementing other options.
   • Call printMenu() in the main() method.
   • Continue to execute the menu until the user enters q to Quit.

Output Example:

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

Choose an option:

5. Implement Output shopping cart menu option

Output Example:

OUTPUT SHOPPING CART

John Doe's Shopping Cart - February 1, 2020

           Number of Items: 8

           Nike Romaleos 2 @ $189 = $378

           Chocolate Chips 5 @ $3 = $15

           Powerbeats 2 Headphones 1 @ $128 = $128

Total: $521

6. Implement Output item's description menu option.

Output Example:

OUTPUT ITEMS' DESCRIPTIONS

John Doe's Shopping Cart - February 1, 2020

Item Descriptions

Nike Romaleos: Volt color, Weightlifting shoes

Chocolate Chips: Semi-sweet

Powerbeats 2 Headphones: Bluetooth headphones

7. Implement Add item to cart menu option.

Output Example:

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

8. Implement Remove item menu option

Output Example:

REMOVE ITEM FROM CART

Enter name of item to remove: Chocolate Chips

          

9. Implement Change item quantity menu option.

             Output Example:

CHANGE ITEM QUANTITY

Enter the item name: Nike

Answer 1

/********* ItemToPurchase.java *******/

public class ItemToPurchase {

   // Declaring instance variables
   private String itemDescription;
   private String itemName;
   private int itemPrice;
   private int itemQuantity;

   // Zero argumented constructor
   public ItemToPurchase() {
       itemDescription = "none";
       itemQuantity = 0;
       itemPrice = 0;
       itemName = "";
   }

   // Parameterized constructor
   public ItemToPurchase(String name, String description, int price,
           int itemQuantity) {
       this.itemDescription = description;
       this.itemName = name;
       this.itemPrice = price;
       this.itemQuantity = itemQuantity;
   }

   // getters and setters
   public String getDescription() {
       return itemDescription;
   }

   public void setDescription(String itemDescription) {
       this.itemDescription = itemDescription;
   }

   public void printItemCost() {
       System.out.println(itemName + " " + itemQuantity + " @ " + itemPrice+ " = $" + (itemQuantity * itemPrice));
   }

   public void printItemDescription() {
       System.out.println(itemName + " " + itemDescription);
   }

   public String getName() {
       return itemName;
   }

   public void setName(String name) {
       this.itemName = name;
   }

   public int getPrice() {
       return itemPrice;
   }

   public void setPrice(int itemPrice) {
       this.itemPrice = itemPrice;
   }

   public int getItemQuantity() {
       return itemQuantity;
   }

   public void setItemQuantity(int itemQuantity) {
       this.itemQuantity = itemQuantity;
   }
}

/************************************************/

/************************************************/

/******* ShoppingCart.java *******/

import java.util.ArrayList;

public class ShoppingCart {
   private String customerName;
   private String currentDate;
   ArrayList<ItemToPurchase> cartItems = null;

   public ShoppingCart() {
       this.cartItems = new ArrayList<ItemToPurchase>();
       currentDate = "January 1, 2016";
       customerName = "none";
   }

   public ShoppingCart(String name, String date) {
       this.cartItems = new ArrayList<ItemToPurchase>();
       this.currentDate = date;
       this.customerName = name;
   }

   public String getCustomerName() {
       return customerName;
   }

   public void setCustomerName(String customerName) {
       this.customerName = customerName;
   }

   public String getCurrentDate() {
       return currentDate;
   }

   public void setCurrentDate(String currentDate) {
       this.currentDate = currentDate;
   }

   /*
   * This method will add the Item to the Cart
   */
   public void addItem(ItemToPurchase i) {
       cartItems.add(i);
   }

   /*
   * This method will remove the Item from the Cart based on the Item name
   */
   public void removeItem(String name) {
       boolean found = false;

       for (ItemToPurchase i : cartItems) {
           if (i.getName().equalsIgnoreCase(name)) {
               cartItems.remove(i);
               found = true;
               break;
           }
       }
       if (!found)
           System.out.println("Item not found in cart. Nothing removed");
   }

   /*
   * This method will modify the quantity of an Item
   */
   public void modifyItem(ItemToPurchase item) {
       boolean found = false;

       for (ItemToPurchase i : cartItems) {
           if (i.getName().equalsIgnoreCase(item.getName())) {

               i.setItemQuantity(item.getItemQuantity());

               found = true;
               break;
           }
       }
       if (!found)
           System.out.println("Item not found in cart. Nothing removed");
   }

   /*
   * This method will return the no of Items in the cart
   */
   public int getNumItemsInCart() {
       int sum = 0;
       for (ItemToPurchase i : cartItems) {
           sum = sum + i.getItemQuantity();
       }
       return sum;
   }

   /*
   * This method will calculate all Items total
   */
   public double getCostOfCart() {
       double sum = 0;
       for (ItemToPurchase i : cartItems) {
           sum = sum + i.getPrice();
       }
       return sum;
   }

   /*
   * This method will display all Items total
   */
   public void printTotal() {
       int tot = 0;
       if (cartItems != null && cartItems.size() > 0) {
           System.out.println(customerName + "'s Shopping Cart - "
                   + currentDate);

           System.out.println("Number of Items: " + getNumItemsInCart());
           System.out.println();
           for (ItemToPurchase i : cartItems) {
               // Calculating the total
               tot += i.getPrice() * i.getItemQuantity();
               i.printItemCost();
           }

           System.out.println("\nTotal : $" + tot);
       } else {
           System.out.println("SHOPPING CART IS EMPTY");
       }
   }

   /*
   * This method will display the Items Descriptions
   */
   public void printDescription() {

       System.out.println(customerName + "'s Shopping Cart - " + currentDate);
       System.out.println("Number of Items: " + getNumItemsInCart());
       System.out.println();
       System.out.println("Item Descriptions");
       for (ItemToPurchase i : cartItems) {
           i.printItemDescription();
       }
   }
}

/************************************************/

/************************************************/

/******* ShoppingCartManager.java *****/

import java.util.Scanner;
public class ShoppingCartManager {
public static void main(String[] args)
{
   /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
Scanner scan = new Scanner(System.in);
  
//Getting the input entered by the user
System.out.println("Enter Customer's Name: ");
String customerName = scan.nextLine();
  
//Getting the input entered by the user
System.out.println("Enter Today's Date: ");
String currentDate = scan.nextLine();
  
// Creaing an instance of ShoppingCart
ShoppingCart s = new ShoppingCart(customerName, currentDate);
System.out.println();
System.out.println("Customer Name: " + s.getCustomerName());
System.out.println("Today's Date: " + s.getCurrentDate());
printMenu(s);
}
  
  
public static void printMenu(ShoppingCart s) {
while (true) {
   //displaying the menu
System.out.println("MENU");
System.out.println("a - Add item to cart");
System.out.println("d - Remove item from cart");
System.out.println("c - Change item quantity");
System.out.println("i - Output items' descriptions");
System.out.println("o - Output shopping cart");
System.out.println("q - Quit");
  
//getting the choice entered by the user
System.out.print("\nChoose an option: ");
Scanner scan = new Scanner(System.in);
char ch = scan.next().charAt(0);
scan.nextLine();
if (ch == 'a' || ch == 'A') {
System.out.println("ADD ITEM TO CART");
System.out.println("Enter Item Name: ");
String name = scan.nextLine();
System.out.println("Enter Item Description: ");
String itemDescritpion = scan.nextLine();
System.out.println("Enter Item Price: ");
int itemPrice = scan.nextInt();
System.out.println("Enter Item Quantity: ");
int quantity = scan.nextInt();
scan.nextLine();
  
// Creating an instance of ItemToPurchase class
ItemToPurchase item = new ItemToPurchase(name, itemDescritpion,itemPrice, quantity);
  
// Adding the Item to the ShoppingCart
s.addItem(item);
}
else if (ch == 'd' || ch == 'D') {
System.out.println("REMOVE ITEM FROM CART");
System.out.println("Enter name of item to remove: ");
String name = scan.nextLine();
s.removeItem(name);
}
else if (ch == 'c' || ch == 'C') {
System.out.println("CHANGE ITEM QUANTITY");
System.out.println("Enter the item name: ");
String name = scan.nextLine();
System.out.println("Enter the new quantity: ");
int quantity = scan.nextInt();
ItemToPurchase item = new ItemToPurchase();
item.setName(name);
item.setItemQuantity(quantity);
s.modifyItem(item);
}
else if (ch == 'I' || ch == 'i') {
System.out.println("OUTPUT ITEMS' DESCRIPTIONS");
s.printDescription();
}
else if (ch == 'O' || ch == 'o') {
System.out.println("OUTPUT SHOPPING CART");
s.printTotal();
}
else if (ch == 'q' || ch == 'Q') {
break;
}
}
}
}

/************************************************/

/************************************************/

Output:

/************************************************/