Создание новой переменной с помощью Java

Question

Попытка выяснить, как создавать новые переменные.Если ваш ввод 2 (2 подростка), и они оба заказывают, общая сумма будет только последним заказом подростка, поскольку переменная для каждого заказа подростка будет сохранена в той же самой переменной.Я пытаюсь выяснить, как создать новые переменные, если в этом ресторане есть несколько человек одного типа.

    import java.util.Scanner;

    public class Lab9 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        //Variables
        int totalGuest;
        int selectOne;
        int selectTwo;
        int selectThree;
        int i;

        //Wing Variables
        double wingAmount;

        //Meal Variables 
        double optionTotalOne = 0;
        double optionTotalTwo = 0;
        double optionTotalThree = 0;

        //Totals
        double discountOneTotal = 0;
        double discountTwoTotal = 0;
        double discountThreeTotal = 0;
        double discountFourTotal = 0;

        double entireAmount = 0;



        //Menu Array
        String menu[] = new String[9];
        menu[0] = "Soup";
        menu[1] = "Wings";
        menu[2] = "Burger";
        menu[3] = "Chicken Sandwhich";
        menu[4] = "Fries";
        menu[5] = "Pie";
        menu[6] = "Ice cream";
        menu[7] = "Soft drink"; 
        menu[8] = "Coffee";

        //Price Array
        double prices[] = new double[9];
        prices[0] = 2.50;
        prices[1] = .15;
        prices[2] = 4.95;
        prices[3] = 5.95;
        prices[4] = 1.99;
        prices[5] = 2.95;
        prices[6] = 2.99;
        prices[7] = 1.50;
        prices[8] = 1.00;

        do {
            System.out.println("Please type a value for NUMBER_IN_PARTY: ");
            totalGuest = input.nextInt();

            //for-loop
            for (i = 1; i <= totalGuest; i++) {

                //Order input for i-th customer
                System.out.println("\n \nPlease input order information for person " + i + "\n \n");

                //Discount menu displayed
                System.out.println("Is this person eligible for a discount? (enter a number 1 - 4)" +
                        "\n1 - if CHILD 5 years of age or younger \n2 - if TEEN between 13 and 19 years of age"
                        + "\n3 - if SENIOR 65 years of age or older \n4 - if NONE of the above \nPlease type a value for DISCOUNT_TYPE: ");
                int discount = input.nextInt();

                //If else statement
                if (discount == 1) {

                    //Price Array for children 5 & under
                    prices[0] = 0;
                    prices[1] = 0;
                    prices[2] = 0;
                    prices[3] = 0;
                    prices[4] = 0;
                    prices[5] = 0;
                    prices[6] = 0;
                    prices[7] = 0;
                    prices[8] = 0;

                    //Menu output
                    System.out.println("Menu items that may be selected: \n1 " + menu[0] + "\n2 " + 
                            menu[1] + "\n3 " + menu[2] + "\n4 " + menu[3] + "\n5 " + menu[4] + "\n6 " + menu[5] +
                            "\n7 " + menu[6] + "\n8 " + menu[7] + "\n9 " + menu[8]);

                    //Menu Item 1 prompt
                    System.out.println("\n \nPlease select menu item 1 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectOne = input.nextInt();

                    //Switch Statement
                    switch(selectOne) {
                    case 1: optionTotalOne = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalOne = wingAmount * prices[1];
                    break;
                    case 3: optionTotalOne = prices[2];
                    break;
                    case 4: optionTotalOne = prices[3];
                    break;
                    case 5: optionTotalOne = prices[4];
                    break;
                    case 6: optionTotalOne = prices[5];
                    break;
                    case 7: optionTotalOne = prices[6];
                    break;
                    case 8: optionTotalOne = prices[7];
                    break;
                    case 9: optionTotalOne = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 2 prompt
                    System.out.println("Please select menu item 2 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectTwo = input.nextInt();

                    //Switch Statement
                    switch(selectTwo) {
                    case 1: optionTotalTwo = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalTwo = wingAmount * prices[1];
                    break;
                    case 3: optionTotalTwo = prices[2];
                    break;
                    case 4: optionTotalTwo = prices[3];
                    break;
                    case 5: optionTotalTwo = prices[4];
                    break;
                    case 6: optionTotalTwo = prices[5];
                    break;
                    case 7: optionTotalTwo = prices[6];
                    break;
                    case 8: optionTotalTwo = prices[7];
                    break;
                    case 9: optionTotalTwo = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 3 prompt
                    System.out.println("Please select menu item 3 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectThree = input.nextInt();

                    //Switch Statement
                    switch(selectThree) {
                    case 1: optionTotalThree = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalThree = wingAmount * prices[1];
                    break;
                    case 3: optionTotalThree = prices[2];
                    break;
                    case 4: optionTotalThree = prices[3];
                    break;
                    case 5: optionTotalThree = prices[4];
                    break;
                    case 6: optionTotalThree = prices[5];
                    break;
                    case 7: optionTotalThree = prices[6];
                    break;
                    case 8: optionTotalThree = prices[7];
                    break;
                    case 9: optionTotalThree = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Discount One Total
                    discountOneTotal = optionTotalOne + optionTotalTwo + optionTotalThree;
                    System.out.printf("Person " + i + " Total: $%.2f" + " (Discount Type 1)", discountOneTotal);

                } else if (discount == 2) {

                    //Price Array Teens & Seniors
                    prices[0] = 2.625 * .75;
                    prices[1] = .1575 * .75;
                    prices[2] = 5.1975 * .75;
                    prices[3] = 6.2475 * .75;
                    prices[4] = 2.0895 * .75;
                    prices[5] = 3.0975 * .75;
                    prices[6] = 3.1395 * .75;
                    prices[7] = 1.575 *.75;
                    prices[8] = 1.05 * .75;

                    //Menu output
                    System.out.println("Menu items that may be selected: \n1 " + menu[0] + "\n2 " + 
                            menu[1] + "\n3 " + menu[2] + "\n4 " + menu[3] + "\n5 " + menu[4] + "\n6 " + menu[5] +
                            "\n7 " + menu[6] + "\n8 " + menu[7] + "\n9 " + menu[8]);

                    //Menu Item 1 prompt
                    System.out.println("\n \nPlease select menu item 1 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectOne = input.nextInt();

                    //Switch Statement
                    switch(selectOne) {
                    case 1: optionTotalOne = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalOne = wingAmount * prices[1];
                    break;
                    case 3: optionTotalOne = prices[2];
                    break;
                    case 4: optionTotalOne = prices[3];
                    break;
                    case 5: optionTotalOne = prices[4];
                    break;
                    case 6: optionTotalOne = prices[5];
                    break;
                    case 7: optionTotalOne = prices[6];
                    break;
                    case 8: optionTotalOne = prices[7];
                    break;
                    case 9: optionTotalOne = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 2 prompt
                    System.out.println("Please select menu item 2 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectTwo = input.nextInt();

                    //Switch Statement
                    switch(selectTwo) {
                    case 1: optionTotalTwo = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalTwo = wingAmount * prices[1];
                    break;
                    case 3: optionTotalTwo = prices[2];
                    break;
                    case 4: optionTotalTwo = prices[3];
                    break;
                    case 5: optionTotalTwo = prices[4];
                    break;
                    case 6: optionTotalTwo = prices[5];
                    break;
                    case 7: optionTotalTwo = prices[6];
                    break;
                    case 8: optionTotalTwo = prices[7];
                    break;
                    case 9: optionTotalTwo = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 3 prompt
                    System.out.println("Please select menu item 3 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectThree = input.nextInt();

                    //Switch Statement
                    switch(selectThree) {
                    case 1: optionTotalThree = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalThree = wingAmount * prices[1];
                    break;
                    case 3: optionTotalThree = prices[2];
                    break;
                    case 4: optionTotalThree = prices[3];
                    break;
                    case 5: optionTotalThree = prices[4];
                    break;
                    case 6: optionTotalThree = prices[5];
                    break;
                    case 7: optionTotalThree = prices[6];
                    break;
                    case 8: optionTotalThree = prices[7];
                    break;
                    case 9: optionTotalThree = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Discount One Total
                    discountTwoTotal = optionTotalOne + optionTotalTwo + optionTotalThree;
                    System.out.printf("Person " + i + " Total: $%.2f" + " (Discount Type 2)", discountTwoTotal);


                }
                else if (discount == 3) {

                    //Price Array Teens & Seniors
                    prices[0] = 2.625 * .75;
                    prices[1] = .1575 * .75;
                    prices[2] = 5.1975 * .75;
                    prices[3] = 6.2475 * .75;
                    prices[4] = 2.0895 * .75;
                    prices[5] = 3.0975 * .75;
                    prices[6] = 3.1395 * .75;
                    prices[7] = 1.575 *.75;
                    prices[8] = 1.05 * .75;

                    //Menu output
                    System.out.println("Menu items that may be selected: \n1 " + menu[0] + "\n2 " + 
                            menu[1] + "\n3 " + menu[2] + "\n4 " + menu[3] + "\n5 " + menu[4] + "\n6 " + menu[5] +
                            "\n7 " + menu[6] + "\n8 " + menu[7] + "\n9 " + menu[8]);

                    //Menu Item 1 prompt
                    System.out.println("\n \nPlease select menu item 1 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectOne = input.nextInt();

                    //Switch Statement
                    switch(selectOne) {
                    case 1: optionTotalOne = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalOne = wingAmount * prices[1];
                    break;
                    case 3: optionTotalOne = prices[2];
                    break;
                    case 4: optionTotalOne = prices[3];
                    break;
                    case 5: optionTotalOne = prices[4];
                    break;
                    case 6: optionTotalOne = prices[5];
                    break;
                    case 7: optionTotalOne = prices[6];
                    break;
                    case 8: optionTotalOne = prices[7];
                    break;
                    case 9: optionTotalOne = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 2 prompt
                    System.out.println("Please select menu item 2 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectTwo = input.nextInt();

                    //Switch Statement
                    switch(selectTwo) {
                    case 1: optionTotalTwo = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalTwo = wingAmount * prices[1];
                    break;
                    case 3: optionTotalTwo = prices[2];
                    break;
                    case 4: optionTotalTwo = prices[3];
                    break;
                    case 5: optionTotalTwo = prices[4];
                    break;
                    case 6: optionTotalTwo = prices[5];
                    break;
                    case 7: optionTotalTwo = prices[6];
                    break;
                    case 8: optionTotalTwo = prices[7];
                    break;
                    case 9: optionTotalTwo = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 3 prompt
                    System.out.println("Please select menu item 3 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectThree = input.nextInt();

                    //Switch Statement
                    switch(selectThree) {
                    case 1: optionTotalThree = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalThree = wingAmount * prices[1];
                    break;
                    case 3: optionTotalThree = prices[2];
                    break;
                    case 4: optionTotalThree = prices[3];
                    break;
                    case 5: optionTotalThree = prices[4];
                    break;
                    case 6: optionTotalThree = prices[5];
                    break;
                    case 7: optionTotalThree = prices[6];
                    break;
                    case 8: optionTotalThree = prices[7];
                    break;
                    case 9: optionTotalThree = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    discountFourTotal = optionTotalOne + optionTotalTwo + optionTotalThree;
                    System.out.printf("Person " + i + " Total: $%.2f" + " (Discount Type 3)", discountFourTotal);
                }else if (discount == 4) {

                    //Price Array for Adults
                    prices[0] += (.05 * prices[0]);
                    prices[1] += (.05 * prices[1]);
                    prices[2] += (.05 * prices[2]);
                    prices[3] += (.05 * prices[3]);
                    prices[4] += (.05 * prices[4]);
                    prices[5] += (.05 * prices[5]);
                    prices[6] += (.05 * prices[6]);
                    prices[7] += (.05 * prices[7]);
                    prices[8] += (.05 * prices[8]);

                    //Menu output
                    System.out.println("Menu items that may be selected: \n1 " + menu[0] + "\n2 " + 
                            menu[1] + "\n3 " + menu[2] + "\n4 " + menu[3] + "\n5 " + menu[4] + "\n6 " + menu[5] +
                            "\n7 " + menu[6] + "\n8 " + menu[7] + "\n9 " + menu[8]);

                    //Menu Item 1 prompt
                    System.out.println("\n \nPlease select menu item 1 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectOne = input.nextInt();

                    //Switch Statement
                    switch(selectOne) {
                    case 1: optionTotalOne = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalOne = wingAmount * prices[1];
                    break;
                    case 3: optionTotalOne = prices[2];
                    break;
                    case 4: optionTotalOne = prices[3];
                    break;
                    case 5: optionTotalOne = prices[4];
                    break;
                    case 6: optionTotalOne = prices[5];
                    break;
                    case 7: optionTotalOne = prices[6];
                    break;
                    case 8: optionTotalOne = prices[7];
                    break;
                    case 9: optionTotalOne = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }


                    //Menu Item 2 prompt
                    System.out.println("Please select menu item 2 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectTwo = input.nextInt();

                    //Switch Statement
                    switch(selectTwo) {
                    case 1: optionTotalTwo = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalTwo = wingAmount * prices[1];
                    break;
                    case 3: optionTotalTwo = prices[2];
                    break;
                    case 4: optionTotalTwo = prices[3];
                    break;
                    case 5: optionTotalTwo = prices[4];
                    break;
                    case 6: optionTotalTwo = prices[5];
                    break;
                    case 7: optionTotalTwo = prices[6];
                    break;
                    case 8: optionTotalTwo = prices[7];
                    break;
                    case 9: optionTotalTwo = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    }

                    //Menu Item 3 prompt
                    System.out.println("Please select menu item 3 (enter a number 1 - 9) \nPlease type a value for SELECTED_ITEM: ");
                    selectThree = input.nextInt();

                    //Switch Statement
                    switch(selectThree) {
                    case 1: optionTotalThree = prices[0];
                    break;
                    case 2: System.out.println("Please enter number of wings to be ordered \nPlease type a value for NUMBER_OF_WINGS: ");
                    wingAmount = input.nextInt();
                    optionTotalThree = wingAmount * prices[1];
                    break;
                    case 3: optionTotalThree = prices[2];
                    break;
                    case 4: optionTotalThree = prices[3];
                    break;
                    case 5: optionTotalThree = prices[4];
                    break;
                    case 6: optionTotalThree = prices[5];
                    break;
                    case 7: optionTotalThree = prices[6];
                    break;
                    case 8: optionTotalThree = prices[7];
                    break;
                    case 9: optionTotalThree = prices[8];
                    break;
                    default: System.out.println("This is not an option on the menu.");
                    break;
                    }

                    //Discount One Total
                    discountThreeTotal = optionTotalOne + optionTotalTwo + optionTotalThree;
                    System.out.printf("Person " + i + " Total: $%.2f" + " (Discount Type 4)", discountThreeTotal);
                }
            }
            }while(i <= totalGuest);

        //Total Amount Printed
        entireAmount = discountOneTotal + discountTwoTotal + discountFourTotal + discountThreeTotal;
        System.out.println(discountOneTotal + "  " + discountTwoTotal + "  " + discountThreeTotal + "  " + discountFourTotal);
        System.out.printf("\n\nGrand Total for Order: $%.2f", entireAmount);

        //Closed Scanner Object
        input.close();
    }

}

Answer 1

Учитывая ваш текущий код, самый простой вариант - превратить ваши суммарные переменные в массивы, например:

double[] discountOneTotal;
double[] discountTwoTotal;
double[] discountThreeTotal;
double[] discountFourTotal;

В настоящее время они не инициализированы, поэтому вам придется инициализировать их после получения количества гостей, например:

discountOneTotal = new double[totalGuest];
discountTwoTotal = new double[totalGuest];
discountThreeTotal = new double[totalGuest];
discountFourTotal = new double[totalGuest];

Теперь у каждого из гостей будут свои собственные общие переменные в массиве. В вашем цикле вы можете использовать их примерно так:

discountThreeTotal[i] = optionTotalOne + optionTotalTwo + optionTotalThree;

Примечание: Вместо массива вы также можете использовать список, но я могу пойти дальше того, что вы узнали до сих пор.