Java ArrayList - Printing Shopping Cart Receipts Project

Oct 26, 2014

I'm new to the concept of ArrayList and I want to solve this problem in my code.

My main problem: I don't know how to sort itemA and itemB to appear only once then It will just add the total prices together.

This is the behavior of my code:

C:Documents and SettingsDrewDesktop>java ReceiptCode
Enter Company Name
ABC Co
Enter STREET ADDRESS
123 Main Street
Enter CITY, STATE, ZIP

[Code] ....

I don't know how to sort itemA and itemB to appear only once then It will just add the total prices together. Here is my sourcecode:

ReceiptCode.java
import java.util.Scanner;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

[Code] ....

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Servlets :: Shopping Cart - Not Add More Than One Item

Dec 30, 2014

I have following servlet to add items into cart -

import java.io.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.RequestDispatcher;

[Code]...

One item gets added to the cart successfully. When adding the second item it gives a Null Pointer Exception at line 53

cart.add(item);

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Shopping Cart Using Array Of Items

Nov 5, 2014

I am working on a project. It is a shopping cart java program that should be setup with an array size of 5 and increased at increments of 3 if you go over 5 items. When I go over 5 items in increases however it changes the item names to null. See output below.

Here is the actual assignment:

In this exercise you will complete a class that implements a shopping cart as an array of items. The file Item.java contains the definition of a class named Item that models an item one would purchase. An item has a name, price, and quantity (the quantity purchased). The file ShoppingCart.java implements the shopping cart as an array of Item objects.

1.Complete the ShoppingCart class by doing the following:

a.Declare an instance variable cart to be an array of Items and instantiate cart in the constructor to be an array holding 5 Items.
b.Fill in the code for the increaseSize method. Your code should be similar to that in the CDCollection class handout but instead of doubling the size just increase it by 3 elements.
c.Fill in the code for the addToCart method. This method should add the item to the cart and update the totalPrice instance variable (note this variable takes into account the quantity).
d. Add a getTotalPrice() method to return the totalPrice.
e..Compile your class.

2.Write a program that simulates shopping. The program should have a loop that continues as long as the user wants to shop. Each time through the loop read in the name, price, and quantity of the item the user wants to add to the cart. After adding an item to the cart, the cart contents should be printed along with a subtotal. After the loop, print a "Please pay ..." message with the total price of the items in the cart. Compile and run this class.

OUTPUT

Enter the name of the item: Apples
Enter the unit price: .5
Enter the quantity: 1

Shopping Cart

ItemUnit PriceQuantityTotal
Apples$0.501$0.50
Total Price: $0.50
Continue shoppping (y/n)?
y
Enter the name of the item: Oranges
Enter the unit price: .5
Enter the quantity: 1

[Code] .....

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JSP :: Shopping Cart - Custom Tag And Image

Jan 4, 2015

I am developing shopping cart in which I am storing image in database and retrieving.

When I select any product category from menu. example, I selected Computer then all list of product related to computer will be return i.e productName, Price and image, By using JSON.

this is my json response and output in comment.

success : function(data) {
if (data.length != 0) {
var d = eval(data);
$("#productList").html("");
for ( var key in d) {

[Code] ....

Alternatively I created custom tag to resolve this.Custom tag is working fine in jsp but in java script it saying error raised Unterminated custom tag. I think I used this custom tag in javascript but i am not sure about this error,

custom tag code for image :
imgByte = product.getImage().getBytes(1, (int) product.getImage().length());
String encodeimage = new String(Base64.encodeBase64(imgByte));
out.println("<tr><td><img src="data:image/jpeg;base64," +encodeimage + ""/><tr> <td>");

MY Question
1 - How can I use Custom tag in javascript ? Or
2 - How can we extract image from json object, like I did in custom tag .

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Servlets :: How To Remove Item From Shopping Cart

Feb 20, 2014

I created a website using jsp and servlet. I made a shopping cart and got the items to display. But how can i remove the items from the cart? Next to each item is a remove button. When that is pressed the item selected needs to be removed and cart needs to refresh.

Here is the code to display the cart:

<table width='700' border='2'>
<tr>
<td>Qty</td>
<td>Name</td>
<td>Price</td>

[Code] .....

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JSP :: Shopping Cart - Calculate Total Price

Sep 21, 2014

I am making a shopping cart web, but some problems I meet about how to calculate the total price

I use ajax in product list web and if I choose one product , it will send the Id that I read from MySql to servlet and use session to save it . and I click the button jump to the cart, the page cart.jsp will read information from session ,and find product information from mysql by id , now my question is where I calculate the total price, servlet or jsp?

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Servlets :: Shopping Cart Session Is Not Working Properly

Jan 4, 2015

I am adding my shopping cart in session like bellow in servlet

HttpSession session = request.getSession();
session.setMaxInactiveInterval(60*30); // 30 minutes
if (session.getAttribute("cart") == null){
session.setAttribute("cart", new ShoppingCart());
}
cart = session.getAttribute("cart");

I seems if more than one person accesses it from server, if they items in the shopping cart, all the product is added to a single session. I mean if i added 4 items first and other person adds 2 items, second person sees 6 products in his cart. Where am I going wrong?

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Servlets :: Shopping Cart - Show Text Based On Which Page A User Is Coming From

May 30, 2014

I am making a shopping cart app in JSP and servlets to bring it all together. Finally.

I have a registration servlet (c1), a registration form jsp (c2), a login jsp (c3). c1 checks if a username is in the database or not.

If the username is not there, then register the user and send them to c3. I want c3 to display a "registration successful" message if a user has just registered successfully and is coming from c1. ELSE, take the user back to c2 with a message which tells them to choose a different username or password etc.

How do I implement the logic of showing a message depending on where a user is coming from ? The servlets and jsps are ready and I only need to add this logic for a custom message. Of course, I could make a JSP for Registration Successful and one for Registration Failure. But, that seems to be unnecessary.

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May 29, 2014

I'm doing an assessment, and we're required to create a small Student program. One class is just a constructor class that the objects will pass through, the other is the main class.

Part of the assessment is to read in the student data from a file, store it in an arraylist, then bubble sort it, list id's lowest to highest. This I have done, and believe it is working correctly.

The next part is to re-sort the ArrayList, ordered by the student id, like it was done in the bubblesort method. This is the part I'm stuck on, I've tried setting the id's in the arraylist via the bubbleSort method, but I'm just having no luck.

Main class.

package assessment.pkg3;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.Scanner;

[Code] .....

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Nov 8, 2014

Basically I am trying to make a POS system and need a way to print a receipt whether there are 1 items sold or 50. So I used a Arraylist. This is the format for the printer that is needed:

printer.printNormal(POSPrinterConst.PTR_S_RECEIPT, " 2 200 Tx Hashi Chop Sticks" + LF);

This is what I tried to do:

ArrayList<String> receiptLine = new ArrayList<>();
public void captureSales(){
receiptLine.add("Test");
System.out.println("Size of the receipt list is: "+receiptLine.size());
System.out.println("Element at index 1: " + receiptLine.get(0));

printer.printNormal(POSPrinterConst.PTR_S_RECEIPT, " " + receiptLine.get(0) + LF);

Error:

Size of the receipt list is: 1
Element at index 1: Test
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

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[Code]...

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Feb 25, 2014

Java Code:

package collectionsHw_netid;
import java.util.ArrayList;
public class ShoppingCart {
//field items
static ArrayList <String> food = new ArrayList<String>();
static ArrayList <Double> price = new ArrayList<Double>();

[Code] ....

Create a new class, ShoppingCart, with a single field, items, that can hold any number of items (Hint: use an ArrayList)

Create a default constructor that creates an empty cart

Create the following methods. After you write each method, test it by running main.

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removeItem which removes an item at a given index

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