How to add transaction subtotals?

[King1010]

Inline Code Example Here
package mariabakeshop;


import java.text.Numb
     * @param message
     *            the prompt string to display
     * @return a String input value
     */
    public static String prompt(String message) {
        String value = "";
        Scanner in = new Scanner(System.in);

        System.out.print(message);
        value = in.nextLine();

        return value;
    }

    /**
     * Convert a double to a currency format
     * 
     * @param value
     *            the double to format
     * @return a currency formatted String
     */
    public static String currency(double value) {
        NumberFormat formatter = NumberFormat.getCurrencyInstance();

        return formatter.format(value);
    }

    /**
     * Determine the discount amount. If the sub-total is greater than or equal
     * to 50, then calculate a discount amount.
     * 
     * @param subTotal
     *            the sub total of goods purchased
     * @param discountRate
     *            the rate of discount
     * @return the discount amount
     */
    public static double getDiscount(double subTotal) {
        char applyDiscount = 'n';
        double discountAmount = 0;
        final double DISCOUNT_RATE = 0.10;




        // should we apply the discount?
        if (subTotal >= 50) {
            applyDiscount = prompt("\nApply 10% discount (y/n)? ")
                    .toLowerCase().charAt(0);

            if (applyDiscount == 'y') {
                discountAmount = subTotal * DISCOUNT_RATE;
            } else {
                System.out.println("Discount not applied.");
            }
        }

        return discountAmount;
    }

    /**
     * Display a receipt
     * 
     * @param product
     *            the product purchased
     * @param subTotal
     *            the sub total of goods purchased
     * @param discount
     *            the discount amount
     * @param gst
     *            the GST
     * @param total
     *            the total of purchase
     * 
     *            PRODUCT: 10x Bread @ $3.00 $30.00 PRODUCT: 10x Cake @ $4.00
     *            $40.00 SUB-TOTAL: $70.00 DISCOUNT: -$7.00 GST: $3.15 =======
     *            TOTAL: $66.15
     * 
     */
    public static void printReceipt(String[] products, int[] quantities,
            double[] prices, int numOfproducts, double subTotal,
            double discount, double gst, double total) {

        for (int i = 0; i < numOfproducts; i += 1) {
            System.out.println("PRODUCT:   " + quantities[i] + "x "
                    + products[i] + " @ " + currency(prices[i]) + " "
                    + currency(quantities[i] * prices[i]));
        }
        System.out.println("SUB-TOTAL: " + rightAlign(currency(subTotal), 9));
        if (discount > 0) {
            System.out.println("DISCOUNT:  "
                    + rightAlign("-" + currency(discount), 9));
        }
        System.out.println("GST:       " + rightAlign(currency(gst), 9));
        System.out.println("TOTAL:     " + rightAlign(currency(total), 9));
    }

    /**
     * Right-align a string value
     * 
     * @param value
     *            the value to align
     * @param width
     *            the column width
     * @return the aligned value
     */
    public static String rightAlign(String value, int width) {
        StringBuilder sb = new StringBuilder(value);

        while (sb.length() < width) {
            sb.insert(0, ' ');
        }

        return sb.toString();

    }

    public static void printTransaction(int numOfTransactions, double subTotal,
            int numOfProducts, final int MAX_TRANSACTIONS, double grossProfit,
            double discountAmount, int transactions[]) {

        grossProfit += subTotal - discountAmount;

        do {
            for (int i = 0; i < MAX_TRANSACTIONS; i += 1) {
                // display the totals
                System.out.println("Total transactions processed: "
                        + numOfTransactions);
                System.out.println("Total gross profit (excluding GST): "
                        + currency(grossProfit));
                break;

            }

        } while (numOfTransactions < MAX_TRANSACTIONS && ("Another transaction (y/n)? ").toLowerCase().charAt(
                0) == 'y');



    }






    public static void main(String[] args) {
        // local variables
        String productName = "";
        double price = -1.0;
        double gstAmount = -1.0;
        double totalPrice = -1.0;
        double subTotal = -1.0;
        // initialize to zero for correct application of discount
        double discountAmount = 0.0;
        int quantity = -1;
        // always process at least one transaction
        int numOfTransactions = 0;
        // total gross profit init to 0 for summing
        double grossProfit = 0;
        // the tax rate as a percentage
        final double GST_RATE = 0.05;
        // the discount as a percentage
        // maximum number of products per transaction
        final int MAX_PRODUCTS = 10;

        // Maximum number of transactions in a day
        final int MAX_TRANSACTIONS = 100;

        // parallel arrays for each transaction
        String[] productNames = new String[MAX_PRODUCTS];
        int[] quantities = new int[MAX_PRODUCTS];
        double[] prices = new double[MAX_PRODUCTS];
        int transactions[] = new int[MAX_TRANSACTIONS];


        int numOfProducts = 0;

        // display the title
        displayTitle();

        do {
            // made a transaction
            numOfTransactions += 1;

            // reset transaction variables
            numOfProducts = 0;
            subTotal += 1;

            System.out.println("Begin Transaction " + numOfTransactions + "\n");

            do {
                // prompt for required input (simple data validation)
                while ((productName = prompt("Enter the product name:  "))
                        .trim().equals(""))
                    ;
                while ((quantity = Integer
                        .parseInt(prompt("Enter the quantity:      "))) <= 0)
                    ;
                while ((price = Double
                        .parseDouble(prompt("Enter the product price: $"))) <= 0)
                    ;

                // place values in the arrays
                productNames[numOfProducts] = productName;
                quantities[numOfProducts] = quantity;
                prices[numOfProducts] = price;
                transactions[numOfProducts] = numOfTransactions;


                // increment the num of products
                numOfProducts = numOfProducts + 1;

                // perform the calculations
                subTotal = quantity * price;
                if (subTotal>=50){
                    System.out.println(getDiscount(discountAmount));
                }

            } while ((numOfProducts < MAX_PRODUCTS)
                    && (prompt("Another product (y/n)? ").toLowerCase().charAt(
                            0) == 'y'));



            gstAmount = GST_RATE * (subTotal - discountAmount);
            totalPrice = subTotal - discountAmount + gstAmount;

            // display the output
            printReceipt(productNames, quantities, prices, numOfProducts,
                    subTotal, discountAmount, gstAmount, totalPrice);

            System.out.println("\nTransaction End " + numOfTransactions);

        } while (prompt("\nQuit the program (y/n)? ").toLowerCase().charAt(0) != 'y');

        printTransaction(numOfTransactions, subTotal, numOfProducts,
                MAX_TRANSACTIONS, grossProfit, discountAmount, transactions);
    }
}

[King1010]

Whoops posted before I could explain what I needed, I need it to show in the output Transaction 1 subtotal:
Transaction 2 subtotal:
etc,etc. I cannot figure out how to make that show in the output, the best I can get is just for the output to have the math already done and only show the total.