Code

   
    /// Name: Afaf Nabeeha
    /// Period: 7
    /// Program Name: Keychains
    /// File Name: Keychains.java
    /// Date Finished: 3/8/2016 public class Keychains

        import java.util.Scanner;
        
        public class Keychains
        {
            public static void main ( String[] args )
            {
                int c, number = 0, price = 10, totalCost = 0;
                
                System.out.println("Ye Olde Keychain Shoppe");
                do
                {
                    Scanner keyboard = new Scanner(System.in);
                
                    System.out.println("\n1. 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.print("\nPlease enter your choice: ");
                    c = keyboard.nextInt();
                
                    if ( c == 1 )
                        number = addKeychains(number);
                    else if ( c == 2 )
                        number = removeKeychains(number);
                    else if ( c == 3 )
                        totalCost = viewOrder(number, price);
                    else if ( c == 4 )
                        checkout(number, totalCost);
                    else 
                        System.out.println("\nERROR");
                        
                }while(c != 4);
                    
            }
            public static int addKeychains(int number)
            {
                Scanner kb = new Scanner(System.in);
                int total, add;
                System.out.print("\nYou have " + number + " keychains. How many to add? ");
                add = kb.nextInt();
                total = number + add;
                System.out.println("You now have " + total + " keychains.");
                return total;
            }
            public static int removeKeychains(int number)
            {
                Scanner kb = new Scanner(System.in);
                int total, subtract;
                System.out.print("\nYou have " + number + " keychains. How many to remove? ");
                subtract = kb.nextInt();
                total = number - subtract;
                System.out.println("You now hava " + total + " keychains.");
                return total;
            }
            public static int viewOrder(int number, int price)
            {
                System.out.println("\nYou have " + number + " keychains.");
                System.out.println("Keychains cost $" + price + " each.");
                int totalCost = price * number;
                System.out.println("Total cost is $" + totalCost + ".");
                return totalCost;
            }
            public static void checkout(int number, int totalCost)
            {
                Scanner kb = new Scanner(System.in);
                String name;
                int cost = 10;
                
                System.out.println("\nCHECKOUT");
                System.out.print("\nWhat is your name? ");
                name = kb.next();
                System.out.println("You have " + number + " keychains.");
                System.out.println("Keychains cost $" + cost + " each.");
                System.out.println("Total cost is $" + totalCost + ".");
                System.out.println("Thanks for your order, " + name + "!");
            }
        }
             
    
Picture of the output