7.22 Ch 7 Program: Online shopping cart (continued) (Java)

Note: Creating multiple Scanner objects for the same input stream yields unexpected behavior. Thus, 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" 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 item quantity (default values of 0). (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. 

(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, 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 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() (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 this message: SHOPPING CART IS EMPTY

printDescriptions()

Outputs each item's description.

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 

(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 

(4) Implement the printMenu() method. 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 the 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. (3 pts) Ex:

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. (3 pts) Ex:

OUTPUT SHOPPING CART 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 

(6) Implement Output item's description menu option. (2 pts) Ex.

OUTPUT ITEMS' DESCRIPTIONS 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 

(7) Implement Add item to cart menu option. (3 pts) 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 

(8) Implement Remove item menu option. (4 pts) Ex:

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

(9) Implement Change item quantity menu option. Hint: Make new ItemToPurchase object and use ItemToPurchase modifiers before using modifyItem() method. (5 pts) Ex:

CHANGE ITEM QUANTITY Enter the item name: Nike Romaleos Enter the new quantity: 3

The code I keep erroring out on is this

ItemToPurchase.java

import java.util.ArrayList;

import java.util.ArrayList;

import java.util.Scanner;

class ItemToPurchase {

private String itemDescription;

private String name;

private double itemPrie;

private int itemQuantity;

public ItemToPurchase() {

itemDescription = "none";

itemQuantity = 0;

itemPrie = 0;

name = "";

}

public ItemToPurchase(String name, String description, double price,

int itemQuantity) {

this.itemDescription = description;

this.name = name;

this.itemPrie = price;

this.itemQuantity = itemQuantity;

}

public String getDescription() {

return itemDescription;

}

public void setDescription(String itemDescription) {

this.itemDescription = itemDescription;

}

public void printCost() {

System.out.println(name + " " + itemQuantity + " @ " + itemPrie

+ " = $" + (itemQuantity * itemPrie));

}

public void printDescription() {

System.out.println(name + " " + itemDescription);

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getPrice() {

return itemPrie;

}

public void setPrice(double itemPrie) {

this.itemPrie = itemPrie;

}

public int getQuantity() {

return itemQuantity;

}

public void setQuantity(int itemQuantity) {

this.itemQuantity = itemQuantity;

}

}

_____________________

ShoppingCart.java

import java.util.ArrayList;

class ShoppingCart {

private String customerName;

private String currentDate;

ArrayList cartItems = new ArrayList();;

public ShoppingCart() {

currentDate = "January 1, 2016";

customerName = "none";

}

public ShoppingCart(String name, String date) {

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;

}

public void addItem(ItemToPurchase i) {

cartItems.add(i);

}

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");

}

public void modifyItem(ItemToPurchase item) {

boolean found = false;

;

for (ItemToPurchase i : cartItems) {

if (i.getName().equalsIgnoreCase(item.getName())) {

if (i.getQuantity() != 0) {

i.setQuantity(item.getQuantity());

}

found = true;

break;

}

}

if (!found)

System.out.println("Item not found in cart. Nothing removed");

}

public int getNumItemsInCart() {

int sum = 0;

for (ItemToPurchase i : cartItems) {

sum = sum + i.getQuantity();

}

return sum;

}

public double getCostOfCart() {

double sum = 0;

for (ItemToPurchase i : cartItems) {

sum = sum + i.getPrice();

}

return sum;

}

public void printTotal() {

if (cartItems != null && cartItems.size() > 0) {

System.out.println(customerName + "'s Shopping Cart - "

+ currentDate);

System.out.println("Number of Items: " + cartItems.size());

System.out.println();

for (ItemToPurchase i : cartItems) {

i.printCost();

}

}

else {

System.out.println("SHOPPING CART IS EMPTY");

}

}

public void printDescriptions() {

System.out.println(customerName + "'s Shopping Cart - " + currentDate);

System.out.println("Number of Items: " + cartItems.size());

System.out.println();

System.out.println("Item Descriptions");

for (ItemToPurchase i : cartItems) {

i.printDescription();

}

}

}

______________________

ShoppingCartManager.java

import java.util.Scanner;

public class ShoppingCartManager {

public static void main(String[] args)

{

Scanner scan = new Scanner(System.in);

System.out.println("Enter Customer's Name:");

String customerName = scan.nextLine();

System.out.println("Enter Today's Date:");

String currentDate = scan.nextLine();

ShoppingCart s = new ShoppingCart(customerName, currentDate);

System.out.println();

System.out.println("Customer Name: " + s.getCustomerName());

System.out.println("Today's Date: " + currentDate);

printMenu(s);

}

public static void printMenu(ShoppingCart s) {

while (true) {

System.out.println("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: ");

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();

ItemToPurchase item = new ItemToPurchase(name, itemDescritpion,

itemPrice, quantity);

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.setQuantity(quantity);

s.modifyItem(item);

}

else if (ch == 'I' || ch == 'i') {

System.out.println("OUTPUT ITEMS' DESCRIPTIONS");

s.printDescriptions();

}

else if (ch == 'O' || ch == 'o') {

System.out.println("OUTPUT SHOPPING CART");

s.printTotal();

}

else if (ch == 'q' || ch == 'Q') {

break;

}

}

}

}

These are the errors I am getting:

3: Unit testkeyboard_arrow_up

0 / 2

Tests default constructor and accessors for ShoppingCart

Compilation failed

zyLabsUnitTest.java:8: error: cannot find symbol if(testCart.getCustomerName() == "none" && testCart.getDate().equals("January 1, 2016")) { ^ symbol: method getDate() location: variable testCart of type ShoppingCart zyLabsUnitTest.java:17: error: cannot find symbol System.out.println("getDate() returns " + testCart.getDate()); ^ symbol: method getDate() location: variable testCart of type ShoppingCart 2 errors

4: Unit testkeyboard_arrow_up

0 / 1

Tests ShoppingCart("John Doe", "February 1, 2016") correctly initializes cart

Compilation failed

Compilation failed

zyLabsUnitTest.java:8: error: cannot find symbol if(testCart.getCustomerName() == "John Doe" && testCart.getDate() == "February 1, 2016") { ^ symbol: method getDate() location: variable testCart of type ShoppingCart zyLabsUnitTest.java:16: error: cannot find symbol System.out.println("getDate() returns " + testCart.getDate()); ^ symbol: method getDate() location: variable testCart of type ShoppingCart 2 errors