private static void login(ArrayList<Shopper> shopper) {
    // TODO Auto-generated method stub
    String username, password;
    Scanner keyboard = new Scanner(System.in);

    System.out.print("Username: ");
    username = keyboard.nextLine();
    System.out.print("Password: ");
    password = keyboard.nextLine();


        for(int i = 0; i<shopper.size(); i++)
        {
            if((shopper.get(i).getusername().equals(username))
                    && (shopper.get(i).getpword().equals(password)))
            {
                System.out.println("Welcome to Daintree " +shopper.get(i).getName()+
                        ". You are log in as " +shopper.get(i).getMemberType());
            }
            else
            {
                System.out.println("Invalid username and password.Please try again!");
            }
        }
}