I'd like to know which part of the code is wrong. My code is:

print("code sample");
import java.util.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import shopping.CD;

public class ShoppingServlet extends HttpServlet {
    @Override
      public void init(ServletConfig conf) throws ServletException {
          super.init(conf);
      }
    @Override
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException{
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession(false);
        if(session == null){
        respond.sendRedirect("error.html");
        }
        Vector buylist = (Vector)session.getValue("shopping.shoppingcart");
        String action = request.getParameter("action");
        if(!action.equals("CHECKOUT")){
            if(action.equals("DELETE")){
                String del = request.getParameter("delindex");
                int d = (new Integer(del)).intValue();
                buylist.removeElementAt(d);
            } else if (action.equals("ADD")){
                // any previous buys of same cd?
                boolean match=false;
                CD aCD = getCD(request);
                if (buylist == null) {
                    // add first cd to the cart
                    buylist = new Vector(); // first order
                    buylist.addElement(aCD);

 }else { // not first buy
                for(int i =0; i < buylist.size(); i++){
                    CD cd = (CD)buylist.elementAt(i);
                    if(cd.getAlbum().equals(aCD.getAlbum())){
                        cd.setQuantity(cd.getQuantity() + aCD.getQuantity());
                        buylist.setElementAt(cd, i);
                        match = true;
                    }// end of if name matches
                }// end of for
                if (!match)
                    buylist.addElement(aCD);
            }}
        session.putValue("shopping.shoppingcart", buylist);
        String url="/Eshop.jsp";
        ServletContext sc = getServletContext();
        RequestDispatcher rd = sc.getRequestDispatcher(url);           
            } else if(action.equals("CHECKOUT")){
                float total=0;
                for(int i=0; i < buylist.size(); i++){
                    CD anOrder = (CD)buylist.elementAt(i);
                    float price = anOrder.getPrice();
                    int qty = anOrder.getQuantity();
                    total += (price * qty);
                }
        total += 0.005;
        String amount = new Float(total).toString();
            int n = amount.indexOf('.');
            amount = amount.substring(0, n+3);
            request.setAttribute("amount", amount);
            String url="Checkout.jsp";
            ServletContext sc = getServletContext();
            RequestDispatcher rd = sc.getRequestDispatcher(url);              
            }
    }
    private CD getCD(HttpServletRequest req){
        String myCd = req.getParameter("CD");
        String qty = req.getParameter("qty");
        StringTokenizer t = new StringTokenizer(myCd, "|");
        String album = t.nextToken();
        String artist = t.nextToken();
        String country = t.nextToken();
        String price = t.nextToken();
        price = price.replace('$', ' ').trim();
        CD cd = new CD();
        cd.setAlbum(album);
        cd.setArtist(artist);
        cd.setCountry(country);
        cd.setPrice((new Float(price)).floatValue());
        cd.setQuantity((new Integer(qty)).intValue());
        return cd;
    }

}
print("code sample");