Question

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

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

MY CODE SO FAR:

ItemToPurchase

public class ItemToPurchase {
  
private String itemName;
private int itemPrice;
private int itemQuantity;
private String itemDescription;
public ItemToPurchase(){
this.itemName = "none";
this.itemPrice = 0;
this.itemQuantity = 0;
this.itemDescription = "none";
}

public ItemToPurchase(String itemName, int itemPrice, int itemQuantity, String itemDescription)
{
this.itemName = itemName;
this.itemPrice = itemPrice;
this.itemQuantity = itemQuantity;
this.itemDescription = itemDescription;
}

//ItemToPurchase(String name, String desc, int qty, int price) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
//}

//ItemToPurchase(String itemName, String none) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
//}

  
public String getName(){
return itemName;
}

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

public int getPrice(){
return itemPrice;
}

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

public int getQuantity(){
return itemQuantity;
}

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

public String getDescription(){
return itemDescription;
}

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

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

// Prints the item name
// and description
public void printItemDescription(){
System.out.println(this.itemName + ": "+ this.itemDescription);
}

}

ShoppingCart

import java.util.ArrayList;
public class ShoppingCart {
private String customerName;
private String currentDate;
private ArrayListcartItemToPurchases = new ArrayList<>();
  

  
public ShoppingCart(){
customerName = "none";
currentDate = "1 January, 2016";
//cartItemToPurchases = new ArrayList();
}

public ShoppingCart(String customerName, String currentDate){
this.customerName = customerName;
this.currentDate = currentDate;
//cartItemToPurchases = new ArrayList();
}
  
public void setCustomerName(String customerName){
this.customerName = customerName;
}
  
public void setDate(String currentDate){
this.currentDate = currentDate;
}

public void addItem(ItemToPurchase itemToPurchaseToPurchase){
if(cartItemToPurchases != null){
cartItemToPurchases.add(itemToPurchaseToPurchase);
}
}

public void removeItem(String itemName){
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
if(itemToPurchase.getName().equals(itemName)){
cartItemToPurchases.remove(itemToPurchase);
return;
}
}
System.out.println("Item not found in cart. Nothing removed.");
}
}

public void modifyItem(ItemToPurchase itemToPurchaseToPurchase){
boolean itemFound = false;
if(cartItemToPurchases != null){
for(ItemToPurchase item : cartItemToPurchases){
if(item.getName().equals(itemToPurchaseToPurchase.getName())){
itemFound = true;
  
if(!itemToPurchaseToPurchase.getDescription().equals("none")){
item.setDescription(itemToPurchaseToPurchase.getDescription());
}
if(itemToPurchaseToPurchase.getQuantity() != 0){
item.setQuantity(itemToPurchaseToPurchase.getQuantity());
}
if(itemToPurchaseToPurchase.getPrice() != 0){
item.setPrice(itemToPurchaseToPurchase.getPrice());
}
}
}
if(itemFound != true){
System.out.println("Item not found in cart. Nothing modified.");
}
}
}

public int getNumItemsInCart(){
int totalQuantity = 0;
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
totalQuantity += itemToPurchase.getQuantity();
}
}
return totalQuantity;
}
  
public int getCostOfCart(){
int totalCostOfCart = 0;
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
totalCostOfCart += (itemToPurchase.getQuantity()* itemToPurchase.getPrice());
}
}
return totalCostOfCart;
}
  
public void printTotal(){
if(cartItemToPurchases == null || cartItemToPurchases.size() == 0){
System.out.println("SHOPPING CART IS EMPTY.");
return;
}
System.out.println(customerName+"\'s"+" Shopping Cart - "+currentDate);
System.out.println("Number of Items: "+getNumItemsInCart());
System.out.println();   
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
itemToPurchase.printItemCost();   
}
System.out.println();
System.out.println("Total: $"+getCostOfCart());
}
  
public void printDescriptions(){
if(cartItemToPurchases == null || cartItemToPurchases.size() == 0){
System.out.println("SHOPPING CART IS EMPTY.");
return;
}
System.out.println(customerName+"\'s"+" Shopping Cart - "+currentDate);
System.out.println("\nItem Descriptions");
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
itemToPurchase.printItemDescription();
}
}

public String getCustomerName(){
return customerName;
}
  
public String getDate(){
return currentDate;
}
}

ShoppingCartManager

import java.util.ArrayList;
import java.util.Scanner;

public class ShoppingCartManager {
public static void main(String[] args)
{
String customerName, currentDate;
Scanner sc = new Scanner(System.in);
System.out.println("Enter Customer's Name:");
customerName = sc.nextLine().toString().trim();
System.out.println("Enter Today's Date:");
currentDate = sc.nextLine().toString().trim();
ShoppingCart cart = new ShoppingCart(customerName, currentDate);
System.out.println();
System.out.println("Customer Name: "+cart.getCustomerName());
System.out.println("Today's Date: "+cart.getDate());
System.out.println();
printMenu(cart);
}

/**
* Prints the menu, and builds the shopping cart
* object passed in as parameter
*/
private static void printMenu(ShoppingCart cart)
{
Scanner sc = new Scanner(System.in);
char choice = 'z';
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");
System.out.println();
System.out.println("Choose an option:");
choice = sc.nextLine().trim().charAt(0);
while(choice != 'q')
{
if(choice != 'a' && choice != 'd' && choice != 'c' && choice != 'i' && choice != 'o')
{
//An invalid choice is made
//Prompt for choice again
System.out.println("Choose an option:");
choice = sc.nextLine().trim().charAt(0);
continue;
}
else
{
switch (choice)
{
case 'o':
{
System.out.println("OUTPUT SHOPPING CART");
cart.printTotal();
break;
}

case 'i':
{
System.out.println("OUTPUT ITEMS' DESCRIPTIONS");
cart.printDescriptions();
break;
}

case 'a':
{
String name, desc;
int price, qty;
System.out.println("ADD ITEM TO CART");
System.out.println("Enter item name:");
name = sc.nextLine().trim().toString();
System.out.println("Enter item description:");
desc = sc.nextLine().trim().toString();
System.out.println("Enter item price:");
price = sc.nextInt();
sc.nextLine();
System.out.println("Enter item quantity:");
qty = sc.nextInt();
sc.nextLine();

ItemToPurchase itemToPurchase = new ItemToPurchase(name, price, qty, desc );
cart.addItem(itemToPurchase);
break;
}

case 'd':
{
String itemToRemove;
System.out.println("REMOVE ITEM FROM CART");
System.out.println("Enter name of item to remove:");
itemToRemove = sc.nextLine().trim().toString();
cart.removeItem(itemToRemove);
break;
}

case 'c':
{
String itemName;
int itemQty;
System.out.println("CHANGE ITEM QUANTITY");
System.out.println("Enter item name:");
itemName = sc.nextLine().trim().toString();
System.out.println("Enter the new quantity:");
itemQty = sc.nextInt();
sc.nextLine();

ItemToPurchase item = new ItemToPurchase(itemName, 0, itemQty, "none");
cart.modifyItem(item);
break;
}
}
System.out.print("Enter an option:");
choice = sc.nextLine().trim().charAt(0);
}
}
}
}

Answer 1

public class ItemToPurchase {
  
private String itemName;
private int itemPrice;
private int itemQuantity;
private String itemDescription;
public ItemToPurchase(){
this.itemName = "none";
this.itemPrice = 0;
this.itemQuantity = 0;
this.itemDescription = "none";
}

public ItemToPurchase(String itemName, int itemPrice, int itemQuantity, String itemDescription)
{
this.itemName = itemName;
this.itemPrice = itemPrice;
this.itemQuantity = itemQuantity;
this.itemDescription = itemDescription;
}

//ItemToPurchase(String name, String desc, int qty, int price) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
//}

//ItemToPurchase(String itemName, String none) {
//throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
//}

  
public String getName(){
return itemName;
}

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

public int getPrice(){
return itemPrice;
}

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

public int getQuantity(){
return itemQuantity;
}

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

public String getDescription(){
return itemDescription;
}

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

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

// Prints the item name
// and description
public void printItemDescription(){
System.out.println(this.itemName + ": "+ this.itemDescription);
}

}

ShoppingCart

import java.util.ArrayList;
public class ShoppingCart {
private String customerName;
private String currentDate;
private ArrayList cartItemToPurchases = new ArrayList<>();
  

  
public ShoppingCart(){
customerName = "none";
currentDate = "1 January, 2016";
//cartItemToPurchases = new ArrayList();
}

public ShoppingCart(String customerName, String currentDate){
this.customerName = customerName;
this.currentDate = currentDate;
//cartItemToPurchases = new ArrayList();
}
  
public void setCustomerName(String customerName){
this.customerName = customerName;
}
  
public void setDate(String currentDate){
this.currentDate = currentDate;
}

public void addItem(ItemToPurchase itemToPurchaseToPurchase){
if(cartItemToPurchases != null){
cartItemToPurchases.add(itemToPurchaseToPurchase);
}
}

public void removeItem(String itemName){
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
if(itemToPurchase.getName().equals(itemName)){
cartItemToPurchases.remove(itemToPurchase);
return;
}
}
System.out.println("Item not found in cart. Nothing removed.");
}
}

public void modifyItem(ItemToPurchase itemToPurchaseToPurchase){
boolean itemFound = false;
if(cartItemToPurchases != null){
for(ItemToPurchase item : cartItemToPurchases){
if(item.getName().equals(itemToPurchaseToPurchase.getName())){
itemFound = true;
  
if(!itemToPurchaseToPurchase.getDescription().equals("none")){
item.setDescription(itemToPurchaseToPurchase.getDescription());
}
if(itemToPurchaseToPurchase.getQuantity() != 0){
item.setQuantity(itemToPurchaseToPurchase.getQuantity());
}
if(itemToPurchaseToPurchase.getPrice() != 0){
item.setPrice(itemToPurchaseToPurchase.getPrice());
}
}
}
if(itemFound != true){
System.out.println("Item not found in cart. Nothing modified.");
}
}
}

public int getNumItemsInCart(){
int totalQuantity = 0;
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
totalQuantity += itemToPurchase.getQuantity();
}
}
return totalQuantity;
}
  
public int getCostOfCart(){
int totalCostOfCart = 0;
if(cartItemToPurchases != null){
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
totalCostOfCart += (itemToPurchase.getQuantity()* itemToPurchase.getPrice());
}
}
return totalCostOfCart;
}
  
public void printTotal(){
if(cartItemToPurchases == null || cartItemToPurchases.size() == 0){
System.out.println("SHOPPING CART IS EMPTY.");
return;
}
System.out.println(customerName+"\'s"+" Shopping Cart - "+currentDate);
System.out.println("Number of Items: "+getNumItemsInCart());
System.out.println();   
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
itemToPurchase.printItemCost();   
}
System.out.println();
System.out.println("Total: $"+getCostOfCart());
}
  
public void printDescriptions(){
if(cartItemToPurchases == null || cartItemToPurchases.size() == 0){
System.out.println("SHOPPING CART IS EMPTY.");
return;
}
System.out.println(customerName+"\'s"+" Shopping Cart - "+currentDate);
System.out.println("\nItem Descriptions");
for(ItemToPurchase itemToPurchase : cartItemToPurchases){
itemToPurchase.printItemDescription();
}
}

public String getCustomerName(){
return customerName;
}
  
public String getDate(){
return currentDate;
}
}

ShoppingCartManager

import java.util.ArrayList;
import java.util.Scanner;

public class ShoppingCartManager {
public static void main(String[] args)
{
String customerName, currentDate;
Scanner sc = new Scanner(System.in);
System.out.println("Enter Customer's Name:");
customerName = sc.nextLine().toString().trim();
System.out.println("Enter Today's Date:");
currentDate = sc.nextLine().toString().trim();
ShoppingCart cart = new ShoppingCart(customerName, currentDate);
System.out.println();
System.out.println("Customer Name: "+cart.getCustomerName());
System.out.println("Today's Date: "+cart.getDate());
System.out.println();
printMenu(cart);
}

/**
* Prints the menu, and builds the shopping cart
* object passed in as parameter
*/
private static void printMenu(ShoppingCart cart)
{
Scanner sc = new Scanner(System.in);
char choice = 'z';
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");
System.out.println();
System.out.println("Choose an option:");
choice = sc.nextLine().trim().charAt(0);
while(choice != 'q')
{
if(choice != 'a' && choice != 'd' && choice != 'c' && choice != 'i' && choice != 'o')
{
//An invalid choice is made
//Prompt for choice again
System.out.println("Choose an option:");
choice = sc.nextLine().trim().charAt(0);
continue;
}
else
{
switch (choice)
{
case 'o':
{
System.out.println("OUTPUT SHOPPING CART");
cart.printTotal();
break;
}

case 'i':
{
System.out.println("OUTPUT ITEMS' DESCRIPTIONS");
cart.printDescriptions();
break;
}

case 'a':
{
String name, desc;
int price, qty;
System.out.println("ADD ITEM TO CART");
System.out.println("Enter item name:");
name = sc.nextLine().trim().toString();
System.out.println("Enter item description:");
desc = sc.nextLine().trim().toString();
System.out.println("Enter item price:");
price = sc.nextInt();
sc.nextLine();
System.out.println("Enter item quantity:");
qty = sc.nextInt();
sc.nextLine();

ItemToPurchase itemToPurchase = new ItemToPurchase(name, price, qty, desc );
cart.addItem(itemToPurchase);
break;
}

case 'd':
{
String itemToRemove;
System.out.println("REMOVE ITEM FROM CART");
System.out.println("Enter name of item to remove:");
itemToRemove = sc.nextLine().trim().toString();
cart.removeItem(itemToRemove);
break;
}