can anyone please help me with this? Note: Creating multiple Scanner objects for
ID: 3858568 • Letter: C
Question
can anyone please help me with this?
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:
Ex. of printItemDescription() output:
(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:
Ex. of printDescriptions() output:
(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.
(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:
(5) Implement Output shopping cart menu option. (3 pts)
Ex:
(6) Implement Output item's description menu option. (2 pts)
Ex.
(7) Implement Add item to cart menu option. (3 pts)
Ex:
(8) Implement Remove item menu option. (4 pts)
Ex:
(9) Implement Change item quantity menu option. Hint: Make new ItemToPurchase object and use ItemToPurchase modifiers before using modifyItem() method. (5 pts)
Ex:
the extended "Online shopping cart" program question was this:
(1) Create two files to submit:
ItemToPurchase.java - Class definition
ShoppingCartPrinter.java - Contains main() method
Build the ItemToPurchase class with the following specifications:
Private fields
String itemName - Initialized in default constructor to "none"
int itemPrice - Initialized in default constructor to 0
int itemQuantity - Initialized in default constructor to 0
Default constructor
Public member methods (mutators & accessors)
setName() & getName() (2 pts)
setPrice() & getPrice() (2 pts)
setQuantity() & getQuantity() (2 pts)
(2) In main(), prompt the user for two items and create two objects of the ItemToPurchase class. Before prompting for the second item, call scnr.nextLine(); to allow the user to input a new string. (2 pts)
Ex:
(3) Add the costs of the two items together and output the total cost. (2 pts)
Ex:
my code was
import java.util.*;
public class ShoppingCartPrinter{
public static void main (String[] args){
Scanner sc=new Scanner(System.in);
ItemToPurchase item1=new ItemToPurchase();
ItemToPurchase item2=new ItemToPurchase();
System.out.println("Item 1");
System.out.println("Enter the item name:");
item1.setName(sc.nextLine());
System.out.println("Enter the item price:");
item1.setPrice(sc.nextInt());
sc.nextLine();
System.out.println("Enter the item quantity:");
item1.setQuantity(sc.nextInt());
sc.nextLine();
System.out.println("");
System.out.println("Item 2");
System.out.println("Enter the item name:");
item2.setName(sc.nextLine());
System.out.println("Enter the item price:");
item2.setPrice(sc.nextInt());
sc.nextLine();
System.out.println("Enter the item quantity:");
item2.setQuantity(sc.nextInt());
sc.close();
System.out.println("");
System.out.println("TOTAL COST");
System.out.println(item1.getName()+" "+item1.getQuantity()+" @ $"+item1.getPrice()+" = $"+(item1.getPrice()*item1.getQuantity()));
System.out.println(item2.getName()+" "+item2.getQuantity()+" @ $"+item2.getPrice()+" = $"+(item2.getPrice()*item2.getQuantity()));
System.out.println("");
System.out.println("Total: $"+(item1.getPrice()*item1.getQuantity()+item2.getPrice()*item2.getQuantity()));
}
}
and
public class ItemToPurchase{
private String itemName;
private int itemPrice;
private int itemQuantity;
public ItemToPurchase(){
this.itemName="none";
this.itemPrice=0;
this.itemQuantity=0;
}
public void setName(String itemName){
this.itemName=itemName;
}
public String getName(){
return this.itemName;
}
public void setPrice(int itemPrice){
this.itemPrice=itemPrice;
}
public int getPrice(){
return this.itemPrice;
}
public void setQuantity(int itemQuantity){
this.itemQuantity=itemQuantity;
}
public int getQuantity(){
return this.itemQuantity;
}
}
which the zybooks program said I got correct.
Explanation / Answer
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.setItemQuantity(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;
}
}
}
}
ShoppingCart.java
import java.util.ArrayList;
public class ShoppingCart {
private String customerName;
private String currentDate ;
ArrayList<ItemToPurchase> cartItems = new ArrayList<ItemToPurchase>();;
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.getItemQuantity()!=0){
i.setItemQuantity(item.getItemQuantity());
}
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.getItemQuantity();
}
return sum;
}
public double getCostOfCart() {
double sum = 0;
for(ItemToPurchase i: cartItems){
sum = sum + i.getItemPrie();
}
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.printItemCost();
}
}
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.printItemDescription();
}
}
}
ItemToPurchase.java
public 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 getItemDescription() {
return itemDescription;
}
public void setItemDescription(String itemDescription) {
this.itemDescription = itemDescription;
}
public void printItemCost() {
System.out.println(name+" "+itemQuantity+" @ "+itemPrie+" = $"+(itemQuantity * itemPrie) );
}
public void printItemDescription() {
System.out.println(name+" "+itemDescription);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getItemPrie() {
return itemPrie;
}
public void setItemPrie(double itemPrie) {
this.itemPrie = itemPrie;
}
public int getItemQuantity() {
return itemQuantity;
}
public void setItemQuantity(int itemQuantity) {
this.itemQuantity = itemQuantity;
}
}
Output:
Enter Customer's Name:
John Doe's Shopping Cart
Enter Today's Date:
February 1, 2016
Customer Name: John Doe's Shopping Cart
Today's Date: February 1, 2016
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:
1
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:
a
ADD ITEM TO CART
Enter Item Name:
Nike Romaleos
Enter Item Description:
Volt color, Weightlifting shoes
Enter Item Price:
189
Enter Item Quantity:
2
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:
i
OUTPUT ITEMS' DESCRIPTIONS
John Doe's Shopping Cart's Shopping Cart - February 1, 2016
Number of Items: 1
Item Descriptions
Nike Romaleos Volt color, Weightlifting shoes
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:
0
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:
q
ShoppingCartPrinter.java
import java.util.Scanner;
public class ShoppingCartPrinter {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
ItemToPurchase item1 = new ItemToPurchase();
ItemToPurchase item2 = new ItemToPurchase();
System.out.println("Item 1");
System.out.print("Enter the item name: ");
String name1 = scan.nextLine();
System.out.print("Enter the item price: ");
int price1 = scan.nextInt();
System.out.print("Enter the item quantity: ");
int quantity1 = scan.nextInt();
item1.setName(name1);
item1.setPrice(price1);
item1.setQuantity(quantity1);
scan.nextLine();
System.out.println("Item 2");
System.out.print("Enter the item name: ");
String name2 = scan.nextLine();
System.out.print("Enter the item price: ");
int price2 = scan.nextInt();
System.out.print("Enter the item quantity: ");
int quantity2 = scan.nextInt();
item2.setName(name2);
item2.setPrice(price2);
item2.setQuantity(quantity2);
System.out.println("TOTAL COST");
int item1Total = item1.getPrice() * item1.getQuantity();
int item2Total = item2.getPrice() * item2.getQuantity();
System.out.println(item1.getName()+" "+item1.getQuantity()+" for $"+item1.getPrice()+" = $"+item1Total);
System.out.println(item2.getName()+" "+item2.getQuantity()+" for $"+item2.getPrice()+" = $"+item2Total);
System.out.println();
System.out.println("Total: $"+(item1Total + item2Total));
}
}
ItemToPurchase.java
public class ItemToPurchase {
private String itemName ;
private int itemPrice;
private int itemQuantity;
public ItemToPurchase(){
itemName = "none";
itemPrice = 0;
itemQuantity = 0;
}
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;
}
}
Output:
Item 1
Enter the item name: Chocolate Chips
Enter the item price: 3
Enter the item quantity: 1
Item 2
Enter the item name: Bottled Water
Enter the item price: 1
Enter the item quantity: 10
TOTAL COST
Chocolate Chips 1 for $3 = $3
Bottled Water 10 for $1 = $10
Total: $13
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