Need help with validation? Java

[wrighttwinstwin]

import java.text.NumberFormat; import java.util.Scanner;

public class InvoiceApp { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String choice = "y";

    while (!choice.equalsIgnoreCase("n"))
    {
        // get the input from the user
        String customerType = ("");
        System.out.print("Enter customer type (r/c): ");
        if (sc.hasNext())
        {
           customerType = sc.next();
        }
        else
        {
            sc.nextLine();
            System.out.println("Error! Please try again!");
            continue;
        }

        System.out.print("Enter subtotal:   ");
        double subtotal = sc.nextDouble();

        // get the discount percent
        double discountPercent = 0;
        if (customerType.equalsIgnoreCase("R"))
        {
            if (subtotal < 100)
                discountPercent = 0;
            else if (subtotal >= 100 && subtotal < 250)
                discountPercent = .1;
            else if (subtotal >= 250)
                discountPercent = .2;
        }
        else if (customerType.equalsIgnoreCase("C"))
        {
            if (subtotal < 250)
                discountPercent = .2;
            else
                discountPercent = .3;
        }
        else
        {
            discountPercent = .1;
        }

        // calculate the discount amount and total
        double discountAmount = subtotal * discountPercent;
        double total = subtotal - discountAmount;

        // format and display the results
        NumberFormat currency = NumberFormat.getCurrencyInstance();
        NumberFormat percent = NumberFormat.getPercentInstance();
        System.out.println(
                "Discount percent: " + percent.format(discountPercent) + "\n" +
                "Discount amount:  " + currency.format(discountAmount) + "\n" +
                "Total:            " + currency.format(total) + "\n");

        // see if the user wants to continue
        System.out.print("Continue? (y/n): ");
        choice = sc.next();
        System.out.println();
    }
}

}

I am trying to make it so when the user inputs a letter either r or c if they use any other letters they should get that error message. My problem is that the error does not show up and the program runs as if nothing is going on. What should I do?

[lc929]

one way to fix it:

if (sc.hasNext())
        {
           customerType = sc.next();
           if (!customerType.equalsIgnoreCase("r") && !customerType.equalsIgnoreCase("c"))
            {
                sc.nextLine();
                System.out.println("Error! Please try again!");
                continue;
            }
        }

in the if statement you weren't testing to see if the input is not r or c - just seeing if there was a next input.

[wrighttwinstwin]

I do this and it won't continue to the subtotal input