Assignemnt #103 and Ult keychains for sale

Code

    ///name: Ben Borglin
    ///period: 6
    ///program name: Keychains Sale
    ///file name: KeychainSale.java
    ///date finished: 12/1/15
    
    import java.util.Scanner;
    
    public class KeychainSale
    {
        public static void main(String[] args)
        {
        Scanner keyboard = new Scanner(System.in);
        int ckey, total, rem;
        total = 0;
        ckey = 0;
        rem = 0;
            
            System.out.println("Keychain shop");
            System.out.println(" ");
            System.out.println("1. Add Keychain to Order");
            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: ");
            int choice = keyboard.nextInt();
            while (choice != 4)
            {
                if ( choice == 1)
                    ckey = addKeychains(ckey);
                else if (choice == 2)
                    ckey = removeKeychains(ckey);
                else if (choice == 3)
                    total = viewOrder(ckey);
                else
                    System.out.println("ERROR: Please choose one of the options");
                System.out.println("");
                    System.out.println("1. Add Keychains to Order");
                    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("Your Choice: ");
                    choice = keyboard.nextInt();
                    System.out.println("");
            }
            
            checkout(ckey, total);
        }
        
        public static int addKeychains (int ckey)
        {   
            int add;
                
            Scanner keyboard = new Scanner(System.in);
            System.out.print("You currently have " + ckey + ". How many would you like to add? ");
            add = keyboard.nextInt();
            ckey = add+ckey;
            System.out.println("You now have " + ckey + " keychains.");
            
            return ckey;
        }
        public static int removeKeychains(int ckey)
        {
            int rem;
            Scanner keyboard = new Scanner(System.in);
            System.out.print("You currently have " + ckey + ". How many would you like to remove? ");
            rem = keyboard.nextInt();
            if (rem > ckey)
            {
                System.out.println("ERROR. YOU DONT HAVE THAT MANY KEYCHAINS");
            }
            ckey = ckey-rem;
            System.out.println("You now have " + ckey + " keychains.");
            
            return ckey;
        }
        public static int viewOrder(int ckey)
        {
            System.out.println("You currently have " + ckey + " keychains.");
            System.out.println("Keychains cost $10 each");
            int total = ckey*10;
            System.out.println("Total cost is $" + total);
            
            return total;
        }
        public static void checkout(int ckey, int total)
        {
            Scanner keyboard = new Scanner(System.in);
            System.out.println("CHECKOUT");
            System.out.println(" ");
            System.out.print("What is your name? ");
            String name = keyboard.next();
            System.out.println("You have " + ckey + " keychains.");
            System.out.println("Total cost is $" + total + ".");
            System.out.println("Thanks for you order, " + name + "!");
        }
    }