simple shopping cart

Dear Guys,
im very beginner in programming and I want to make a simple shopping cart as follows and a cant figure it out :

this program should allow the user to order from small catalogue then calculate the final bill including tax at 20 %. sample program should look like this:

our catalogue [ product code in brackets]:
1-water [k1234] 3$
2-honey [k123] 2$
3-meat [p123] 1$
Buy something!

Enter order number (o to stop): k1234
Enter Quantity : 5
Enter order number (o to stop): 5667
Sorry I don't understand use product code only.
Enter order number (o to stop): 0
your order
5 water @ 3$ = 15 $
subtotal : 15.00 $ Tax @ 20 % : ..............


please guy I need some help

Do you have any specific questions about your assignment?
Please post your code and any questions about problems you are having.

Code :

---

import java.util.Scanner;
public class shop2 {
   {
 
  public static void main(String[] args)
  {
 
  Scanner in = new Scanner(System.in);
  int qty ;
  double k3876=3.00 ,p3487=2.50 ,z9983=12.75;
   String ordernumber ;
  boolean order =true;
  double total;
  System.out.println("Our catalogue [Product codes in brackets]");
        System.out.println("(1) Condensed Powdered water [P3487], $2.50 per packet.");
        System.out.println("(2) Distilled Moonbeans [K3876], $3.00 for a dozen.");
        System.out.println("(3) Anti-Gravity Pills [Z9983], $12.75 for 60.");
        System.out.println("Buy something!");
        System.out.println("Enter order number!");
 
               ordernumber = in.nextLine();
        switch (ordernumber){
          case "p3487":
                    System.out.print("Enter Quantity: ");
                    qty = in.nextInt();
                    total= (qty * p3487);
                    System.out.println("nter Order Number (0 to stop)");
                    ordernumber =in.nextLine();                  break;
                case "k3876":
                    System.out.print("Enter Quantity: ");
                    qty = in.nextInt();
 
                    break;
                case "z9983":
                    System.out.print("Enter Quantity: ");
                    qty = in.nextInt();
 
                    break;
                case "0":
                    order = false;
                    break;
                default:
                    System.out.println("Sorry, I don't understand! Use Product Codes only.");
                    break;
        }
                    System.out.println("Your order: " + ordernumber);
            }
        }

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You forgot to ask any specific questions about your code and the assignment. Please re-read Norm's post above.