Shopping Cart .. need help..URGENT!!

Question

can somebody help me regarding abt my shopping cart.. i have successfully add the item to the cart.. but the problem is, whenever i add the same item in the cart, the quantity does not increased by one.. instead it duplicate itself in the cart... ?!?!?!?
below are the codes...
cart.java
package OnlineShopBeans;
import java.util.*;
public class cart {
private int noItems = 0;
private Vector prodNames = new Vector(4);
private Vector prodPrices = new Vector(4);
private Vector prodSize = new Vector(4);
private Vector prodColour = new Vector(4);
private Vector prodOther = new Vector(4);
private Vector prodQty1 = new Vector(4);
/* Create a new cart */
public cart() {};
/* Add a shopper item */
public void addItem(String strName, String dPrice, String dSize,String dColour,String dOther, String dQty) {
noItems++;
prodNames.add(strName.trim());
prodPrices.add(dPrice);
prodSize.add(dSize);
prodColour.add(dColour);
prodOther.add(dOther);
prodQty1.add(dQty);
/* Remove a shopper item */
public void removeItem(int itemIndex) {
if (itemIndex >= 0) {
noItems--;
prodNames.remove(itemIndex);
prodPrices.remove(itemIndex);
prodQty1.remove(itemIndex);
prodSize.remove(itemIndex);
prodColour.remove(itemIndex);
prodOther.remove(itemIndex);
/* Update the quantities */
public void updateQtys(String[] qtys) {
for (int i=0; i < qtys.length; i++) {
prodQty1.setElementAt(qtys, i);
/* Clear all items */
public void clearItems() {
noItems = 0;
prodNames.clear();
prodPrices.clear();
prodQty1.clear();
prodSize.clear();
prodColour.clear();
prodOther.clear();
/* Get all items' ProdName */
public String[] getProdNames() {
String[] allProdNames = new String[noItems];
for (int i = 0; i < noItems; i++) {
allProdNames[i] = (String)prodNames.elementAt(i);
return allProdNames;
public double[] getProdPrices(){
double[] allProdPrices = new double[noItems];
for (int i = 0; i < noItems; i++) {
allProdPrices[i] = Double.parseDouble((String)prodPrices.elementAt(i));
return allProdPrices;
public String[] getProdSize() {
String[] allProdSize = new String[noItems];
for (int i = 0; i < noItems; i++) {
allProdSize[i] = (String)prodSize.elementAt(i);
return allProdSize;
public String[] getProdColour() {
String[] allProdColour = new String[noItems];
for (int i = 0; i < noItems; i++) {
allProdColour[i] = (String)prodColour.elementAt(i);
return allProdColour;
public int[] getProdQty1() {
int[] allProdQty1 = new int[noItems];
for (int i = 0; i < noItems; i++) {
allProdQty1[i] = Integer.parseInt((String)prodQty1.elementAt(i));
return allProdQty1;
public String[] getProdOther() {
String[] allProdOther = new String[noItems];
for (int i = 0; i < noItems; i++) {
allProdOther[i] = (String)prodOther.elementAt(i);
return allProdOther;
this is some of the code.jsp
<% if (actionType.equals("add")) {
String prodName = request.getParameter("name");
String prodSize = request.getParameter("s");
String prodColour = request.getParameter("co");
String prodPrice = request.getParameter("price");
String prodQ = request.getParameter("qty");
String prodOther = request.getParameter("ot");
int found=0;
for (int j=0; j < prodLength.length; j++) {
if (prodName.equals(prodLength[j])) {
found = 1;
//what should i type here???? }
if (found == 0) {
cart.addItem(prodName, prodPrice, prodSize, prodColour,prodOther, prodQ);

Answer 1

hi.. JSP is a new thingy for me.. i appreciate if u can help me in solving these 2 problems.. thanks..
i have write a new code and now i can update the quantity when the user click "add to cart" on the same item.. but i need ur help.. i have 2 problems..
(1):
if i had a textbox for the buyerto enter how many qty they want to purchase for that item, then update the qty respectively to how many the buyer want.
e.g. first enter 5 qty... display 5 in the cart. then enter 2 qty.. display 7 in the cart..
how will the code be?? should it be in the java beans??? or the cart.jsp??
(2):
i cannot remove the item in the cart.. try to remove one item at a time.. but the system does not remove the item.. can u also help me in this..
below are the new code..
---JAvaBeans---
public class ShoppingCart {
       //private int noItems = 0;
     Vector products = new Vector();
          public void addProduct(Product i){
               boolean productFound = false;
               Enumeration productEnum= getProducts();
               while(productEnum.hasMoreElements()){
                         Product product = (Product)productEnum.nextElement();
                         if(product.getId().equals(i.id)){
                              productFound = true;
                              //product.quantity += 1;
                              product.quantity += product.quantity;
                              break;
               if(!productFound){
                    products.addElement(i);
          public void deleteProduct(String id){
           Enumeration productEnum = getProducts();
               while(productEnum.hasMoreElements()){
                         Product product = (Product)productEnum.nextElement();
                         if(product.getId().equals(id)){                                             
                              products.removeElement(product);
                              break;                         
          public void emptyCart(){
               products = new Vector();
          public int getNoProducts(){
               return products.size();     
          public Enumeration getProducts(){
               return products.elements();
          public double getTotal(){
               Enumeration productEnum = getProducts();
               double total=0;
                    while(productEnum.hasMoreElements()){
                         Product product = (Product)productEnum.nextElement();
                         total = total + product.getTotal();
                    return total;
JSP Page-
<%@page import="java.util.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<META name="GENERATOR" content="IBM WebSphere Studio">
<META http-equiv="Content-Style-Type" content="text/css">
<LINK href="theme/Master.css" rel="stylesheet" type="text/css">
<TITLE>viewsc1.jsp</TITLE>
</HEAD>
<BODY>
<jsp:useBean id="sCart" class="product.ShoppingCart" scope="session"/>
<%@page import="product.Product"%>
     <table width="80%" border="0" align="center">
       <tr>
         <td align="center"><img src="image/title.jpg" width="450" height="80"></td>
       </tr>
       <tr>
         <td align="center" height="90">�</td>
       </tr>
       <tr>
         <td align="center" height="210">
             <table width="98%" border="1" height="142">
               <tr>
                 <td height="129">
                   <table border="0" width="100%">
                     <tr>
                       <td colspan="8" bgcolor="#CCCC99" align="center" height="22">
                         <img src="image/vsc.jpg" width="300" height="50">
                       </td>
                     </tr>
                     <tr>
                       <td height="15" colspan="8"></td>
                     </tr>
<%
String name= request.getParameter("name");
if(name!= null){
     if(name.equals("delete")){
          String id = request.getParameter("Id");
          out.println(id);
          sCart.deleteProduct(id);
if(sCart.getNoProducts()!=0){%>
        <tr>
          <td height="15" align="center" width="20%"><B>Item ID</B></td>         
          <td height="15" align="center" width="20%"><B>Item Name</B></td> 
          <td height="15" align="center" width="11%"><b>Size</b></td>
          <td height="15" align="center" width="9%"><B>Colour</b></td>                               
          <td height="15" align="center" width="13%"><b>Price</b></td>     
          <td height="15" align="center" width="10%"><b>Qty</b></td>
          <td height="15" align="center" width="12%"></td>
          <td height="15" align="center" width="12%"><b>Total:</b></td>
        </tr>
<%     
          Enumeration products =sCart.getProducts();
          while(products.hasMoreElements()){
               Product product = (Product)products.nextElement();
          %>
          <tr>        
          <td height="15" align="center" width="20%"><B><%=product.getId() %></B></td> 
          <td height="15" align="center" width="11%"><b><%=product.getName() %></b></td>         
          <td height="15" align="center" width="9%"><B><%=product.getSize() %></b></td>
          <td height="15" align="center" width="9%"><B><%=product.getColour() %></b></td>                                                          
          <td height="15" align="center" width="13%"><b><%=product.getPrice() %></b></td>          
          <td height="15" align="center" width="9%"><B><%=product.getQuantity() %></b></td>     
          <td height="15" align="center" width="9%"><B><%=product.getOther() %></b></td>
          <td height="15" align="center" width="10%"><b><%=product.getTotal() %></b></td>
           <td align='center'><a href="viewsc1.jsp?name=delete&Id=<%=product.getId() %>">Remove</a></td>
        </tr>
<%          } %>
<tr>
<td height="50" valign="bottom" colspan="8" height="15" align="right" width="12%"><b>Total:</b><%=sCart.getTotal() %></td>
</tr>
<%
}else{
     out.println("Your Shopping cart is Empty<BR>");
%>
<tr>
                  <td colspan="8" height="15" align="center">
                    <a href=chooseCategory.jsp><IMG border="0" src="image/BtnContinueshop.gif" width="153" height="27"></a>
                    <a href=EmptyCart.jsp><IMG border="0" src="image/BtnEmptyBsk.gif" width="75" height="27"> </a>
                    <a href=checkout.jsp><IMG border="0" src="image/BtnCheckOut.gif" width="156" height="27"></a>
                </td>
                </tr>
              </table>
</BODY>
</HTML>