Assignemnt #103 Keychains for Sale, real ultimate power

Code

    ///Name: Prooz Fereydouni
    ///Period: 7
    ///Project Name: Keychains for Sale, real ultimate power
    ///File Name: KfS3.java
    ///Date: 3/31/2016
  
import java.util.Scanner;

public class KfS3
{
    public static void main( String[] args)
    {
        Scanner kb = new Scanner(System.in);
        double tax = 8.25;
        int ship = 5;
        int addship = 1;
        int cost = 20;
        int keys = 0;
        System.out.println("Keychain Store");
        System.out.println("");
        int answer = 0;
        do
        {
            System.out.println("1. Add keychains");
            System.out.println("2. Remove Keychains from Order");
            System.out.println("3. View Current Order");
            System.out.println("4. Checkout");
            System.out.println("");
            System.out.print("Please enter your choice: ");
            answer = kb.nextInt();
            if (answer == 1) keys = AddKeychain(keys);
			if (answer == 2) keys = RemoveKeychain(keys);
			if (answer == 3) ViewOrder(keys, cost, tax, ship, addship);
            if (answer == 4) Checkout(keys, cost, tax, ship, addship);
            if (answer <1 || answer > 4) 
            {
                System.out.println("Wrong Input!");
                answer = kb.nextInt();
            }
        }while(answer!=4);
    }
    public static int AddKeychain(int key)
    {
        Scanner kb = new Scanner(System.in);
        System.out.print("You have " + key + " keychains. How many to add? ");
        int add = kb.nextInt();
        if(add<0)
        {
            System.out.println("Wrong Input!");
            add = kb.nextInt();
        }
        key = add + key;
        System.out.println("You now have " + key + " keys.");
        return key;
    }
    public static int RemoveKeychain(int key)
    {
        Scanner kb = new Scanner(System.in);
        System.out.print("You have " + key + " keychains. How many to remove? ");
        int remove = kb.nextInt();
        if(remove<0)
        {
            System.out.println("Wrong Input!");
            remove = kb.nextInt();
        }
        key = key - remove;
        System.out.println("You now have " + key + " keys.");
        return key;
    }
    public static void ViewOrder(int key, int cost, double tax, int ship, int addship)
    {
        System.out.println("You have " + key + " keychains.");
        System.out.println("They each cost $" + cost + ".");
        int shipcharge = ship + (key - 1) * addship;
        System.out.println("The shipping charge is $" + shipcharge + ".");
        int SubtotalCost = key * cost + shipcharge;
        System.out.println("Subtotal cost is $" + SubtotalCost + ".");
        double taxed = tax / 100 * (SubtotalCost - shipcharge);
        System.out.println("The tax on the item(s) is $" + taxed + ".");
        double total = SubtotalCost + taxed;
        System.out.println("The total price is $" + total + ".");
    }
    public static void Checkout(int key, int cost, double tax, int ship, int addship)
    {
        Scanner kb = new Scanner(System.in);
        System.out.print("What is your name? ");
        String name = kb.next();
        System.out.println("You have " + key + " keychains.");
        System.out.println("They each cost $" + cost + ".");
        int shipcharge = ship + (key - 1) * addship;
        System.out.println("The shipping charge is $" + shipcharge + ".");
        int SubtotalCost = key * cost + shipcharge;
        System.out.println("Subtotal cost is $" + SubtotalCost + ".");
        double taxed = tax / 100 * (SubtotalCost - shipcharge);
        System.out.println("The tax on the item(s) is $" + taxed + ".");
        double total = SubtotalCost + taxed;
        System.out.println("The total price is $" + total + ".");
        System.out.println("Thanks for your order, " + name + "!");
    }
}

    

Picture of the output