Java所得税计算器需要添加提示才能添加更多客户

Question

我有一个java程序，可以计算用户的所得税，有一些帮助项目现在可以正常运行，但我应该添加一个选项，让用户在完成与客户的交易后，通过在提示符中输入“y”来处理其他客户。我需要提示：“处理另一个客户？（y/n）？”由于用户也可以点击“n”，因此此提示符还必须有一个用于“y”和“n”的命令。如何以及在何处执行此操作，以及需要将提示符放在代码中的何处？这是我的密码：

import java.util.Scanner;

public class TaxCalculator {
    public static void main(String[] args) {
        final double RATE1 = 0.20;
        final double RATE2 = 0.25;
        final double RATE3 = 0.10;
        final double RATE4 = 0.15;
        final double RATE5 = 0.30;
        final double RATE1_SINGLE_LIMIT = 0;
        final double RATE2_MARRIED_LIMIT = 0;
        final double RATE3_COHABITATING_LIMIT = 20000;
        final double RATE4_COHABITATING_LIMIT = 50000;
        double tax = 0;

        //Enter Income
        Scanner in = new Scanner(System.in);
        System.out.print("Please enter your income: ");
        double income = in.nextDouble();

        System.out.print("Please enter 's' for single, 'm' for married, or 'c' for cohabitating: ");
        String maritalStatus = in.next();

        //Calculate Taxes

        if (maritalStatus.equals("s") && income > RATE1_SINGLE_LIMIT) {
            tax = RATE1 * income;
        }else if (maritalStatus.equals("m") && income > RATE2_MARRIED_LIMIT) {
            tax = RATE2 * income;
        }else if (maritalStatus.equals("c") && income <= RATE3_COHABITATING_LIMIT) {
            tax = RATE3 * income;
        }else if (maritalStatus.equals("c") && income <= RATE4_COHABITATING_LIMIT) {
            tax = RATE4 * income;
        } else {
            tax= RATE5 * income;
        }

        System.out.print("Your tax is: " + tax);
    }
}

Answer 1

利用do...while循环
The while and do-while Statements | Java Documentation

import java.util.Scanner;

public class TaxCalculator {
    static void calculate() {

        final double RATE1 = 0.20;
        final double RATE2 = 0.25;
        final double RATE3 = 0.10;
        final double RATE4 = 0.15;
        final double RATE5 = 0.30;
        final double RATE1_SINGLE_LIMIT = 0;
        final double RATE2_MARRIED_LIMIT = 0;
        final double RATE3_COHABITATING_LIMIT = 20000;
        final double RATE4_COHABITATING_LIMIT = 50000;
        double tax = 0;
        Scanner in = new Scanner(System.in);
        //Enter Income
        System.out.print("Please enter your income: ");
        double income = in.nextDouble();
        in.nextLine();

        System.out.print("Please enter 's' for single, 'm' for married, or 'c' for cohabitating: ");
        String maritalStatus = in.next();
        in.nextLine();

        //Calculate Taxes

        if (maritalStatus.equals("s") && income > RATE1_SINGLE_LIMIT) {
            tax = RATE1 * income;
        } else if (maritalStatus.equals("m") && income > RATE2_MARRIED_LIMIT) {
            tax = RATE2 * income;
        } else if (maritalStatus.equals("c") && income <= RATE3_COHABITATING_LIMIT) {
            tax = RATE3 * income;
        } else if (maritalStatus.equals("c") && income <= RATE4_COHABITATING_LIMIT) {
            tax = RATE4 * income;
        } else {
            tax = RATE5 * income;
        }

        System.out.print("Your tax is: " + tax);

    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String newResponse = "";
        do {
            calculate();
            System.out.println();
            System.out.println("Process another response?. Please enter 'y' for yes, or 'n' for no: ");
            newResponse = in.next();
            in.nextLine();
        } while (newResponse.equals("y"));

    }
}

Answer 2

您可以在程序结束时执行此操作，在显示第一个用户的税务后，您可以询问是否有新用户，如果有，您将重复与第一个用户相同的步骤，如果没有，您的程序将完成。为此，您必须先添加一个布尔变量（或您想要的整数），以了解是否有新用户：

boolean newCustomer = false;

然后，您的整个代码将在do while循环中，如下所示：

do{
Scanner in = new Scanner(System.in);
System.out.print("Please enter your income: ");
double income = in.nextDouble();

System.out.print("Please enter 's' for single, 'm' for married, or 'c' for cohabitating: ");
String maritalStatus = in.next();

//Calculate Taxes

if (maritalStatus.equals("s") && income > RATE1_SINGLE_LIMIT) {
    tax = RATE1 * income;
}else if (maritalStatus.equals("m") && income > RATE2_MARRIED_LIMIT) {
    tax = RATE2 * income;
}else if (maritalStatus.equals("c") && income <= RATE3_COHABITATING_LIMIT) {
    tax = RATE3 * income;
}else if (maritalStatus.equals("c") && income <= RATE4_COHABITATING_LIMIT) {
    tax = RATE4 * income;
} else {
    tax= RATE5 * income;
}

System.out.println("Your tax is: " + tax);

    System.out.print("Please type 'y' for a new customer, or 'n' to finish the program : ");
    String customer = in.next();
    if(customer.equals("y"))
        newCustomer = true;
    else
        newCustomer = false;
}
while(newCustomer);