Assignemnt 103 and Keychains Ultimate Power

Code

    /// Name: Xinting Chen
    /// Period: 7
    /// Program Name: Keychains Ultimate Power
    /// File Name: KeychainsUltimatePower.java
    /// Date Finished: 3/31/2016
  
        import java.util.Scanner;
        import java.util.InputMismatchException;
        
        public class KeychainsUltimatePower{
            static Scanner keyboard = new Scanner(System.in);
            static int currentKey = 0;
            static float tax = 0.0825f;
            static int shipping = 5;
            static int shippingperKey = 1;
            static int price = 7;
            public static void main(String[] args){
                System.out.println("WELCOME");
                
                int choice = 0;
                
                do{
                    showMenu();
                    
                    do choice = choice();
                    while (choice ==0);
                    
                    if (choice == 1) addKey();
                    if ( choice == 2) removeKey();
                    if (choice == 3) viewOrder();
                    
                }
                while (choice!=4);
                
                checkOut();
                
                System.out.println();
            }
            
            public static void showMenu(){
                System.out.println("1) Add Keychains to Order");
                System.out.println("2) Remove Keycahins from Order");
                System.out.println("3) View Current Order");
                System.out.println("4) Check Out");
            }
            
            public static int choice() {
                int choice = 0;
                System.out.print("Choice: ");
                choice = keyboard.nextInt();
                        System.out.println();
        
                
                if (choice < 1 || choice > 4) choice = 0;
                
                return choice;
            }
            
            public static void addKey(){
                System.out.print("How many?: ");
                try{
                    int add = keyboard.nextInt();
                    if ( add>0)
                    {
                     currentKey += add;
                        System.out.println();
                     System.out.println(add + " KEYCHAIN ADDED");
                 
                        chainz();
                    }
                    else System.out.println("ERROR");
                }
                catch (InputMismatchException e)
                {
                    System.out.println("ERROR");
                }
                
                
                
                
            }
            
            public static void removeKey(){
                System.out.print("How many?: ");
                try {
                    int del = keyboard.nextInt();
                    if ( del > 0 && del <= currentKey){
                        currentKey -= del;
                        System.out.println();
                        System.out.println(del + " KEYCHAIN REMOVED");
                       
                        chainz();
                    }
                    else System.out.println("ERROR");
                }
                catch (InputMismatchException e){
                    System.out.println("ERROR");
                }
        
                
            
            }
            public static void viewOrder(){
                System.out.println();
                int cost = (price*currentKey+(shipping + currentKey*shippingperKey));
                chainz();
                System.out.println("$7 per Keychains.");
              
                System.out.println("Price: $"+(price*currentKey)+".");
                System.out.println("Shipping fee: $"+(shipping+currentKey*shippingperKey)+".");
                System.out.println("Price + shipping fee: $"+cost+".");
                double pTax = (0.0825*(price*currentKey+(shipping + currentKey*shippingperKey)));
                System.out.println("Tax: $"+pTax+".");
        
                System.out.println("TOTAL COST:$"+cost*(1+tax)+".");
            }
            
            
            public static void checkOut(){
                System.out.print("What is your name? ");
                String name = keyboard.next();
                chainz();
                System.out.println("Keychains cost $7 each.");
                int cost = (price*currentKey);
                System.out.println("Total cost is $"+cost);
                System.out.println("Thanks for your order, "+name+" !");
            
                
                
                
            }
            
            public static void chainz() {
                
                System.out.println("YOU HAVE "+currentKey+" KEYCHAINS.");
            }
        }
        




    

Picture of the output