具有Sentinel值的Java Do-While循环= -1未终止

Question

我的教授和我似乎无法理解为什么具有-1的标记值的do-while循环没有终止。即使在为employeeID输入-1的sentinel值之后，do-while循环仍继续循环。有人可以帮忙吗？

我的哨兵价值有问题吗？是因为我使用的是switch语句吗？

谢谢。

import java.util.Scanner;
import java.text.DecimalFormat;

public class Ass4_WeeklyPayrollTaxGuideWhileLoopIf_Scanner {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);
        DecimalFormat formatter = new DecimalFormat("#0.00");

        int withExempt, employeeID;
        double hourlyWage, hoursWorked, currentEarnings, taxFICA, withExemptAmount;
        double previousYTD, adjWeeklyIncome, currentYTD, taxFederal, payTakeHome;
        String input;
        char maritalStatus;

        System.out.print("Enter employee id number: ");
        employeeID = keyboard.nextInt();
        System.out.print("Enter hourly wage: $");
        hourlyWage = keyboard.nextDouble();
        System.out.print("Enter hours worked: ");
        hoursWorked = keyboard.nextDouble();
        System.out.print("Enter number of withholding exemptions: ");
        withExempt = keyboard.nextInt();
        System.out
                .print("Enter marital status: [For married, enter m. " + "For single, enter s.] ");
        input = keyboard.next();
        maritalStatus = input.charAt(0);
        System.out.print("Enter previous year-to-date earnings: $");
        previousYTD = keyboard.nextDouble();

        while (employeeID != -1) {
            if (hoursWorked > 40)
                currentEarnings = ((hoursWorked - 40) * hourlyWage * 1.5) + (40 * hourlyWage);
            else
                currentEarnings = (hourlyWage * hoursWorked);

            taxFICA = (currentEarnings * 0.062) + (currentEarnings * 0.0145);
            withExemptAmount = withExempt * 51.92;
            adjWeeklyIncome = currentEarnings - withExemptAmount;
            currentYTD = currentEarnings + previousYTD;
            taxFederal = 0;

            switch (maritalStatus) {
            case 's':
            case 'S':
                if (adjWeeklyIncome <= 51)
                    taxFederal = 0;
                else if (adjWeeklyIncome <= 517)
                    taxFederal = ((adjWeeklyIncome - 51) * 0.15);
                else if (adjWeeklyIncome <= 1105)
                    taxFederal = (69.90 + ((adjWeeklyIncome - 517) * 0.28));
                else if (adjWeeklyIncome <= 2493)
                    taxFederal = (234.54 + ((adjWeeklyIncome - 1105) * 0.31));
                else if (adjWeeklyIncome <= 5385)
                    taxFederal = (664.82 + ((adjWeeklyIncome - 2493) * 0.36));
                else
                    taxFederal = (1705.94 + ((adjWeeklyIncome - 5385) * 0.396));
                break;

            case 'm':
            case 'M':
                if (adjWeeklyIncome <= 124)
                    taxFederal = 0;
                else if (adjWeeklyIncome <= 899)
                    taxFederal = ((adjWeeklyIncome - 124) * 0.15);
                else if (adjWeeklyIncome <= 1855)
                    taxFederal = (116.25 + ((adjWeeklyIncome - 899) * 0.28));
                else if (adjWeeklyIncome <= 3084)
                    taxFederal = (383.93 + ((adjWeeklyIncome - 1855) * 0.31));
                else if (adjWeeklyIncome <= 5439)
                    taxFederal = (764.92 + ((adjWeeklyIncome - 3084) * 0.36));
                else
                    taxFederal = (1612.72 + ((adjWeeklyIncome - 5439) * 0.396));
                break;
            default:
                System.out.print("Incorrect entry for marital status.");
            }

            payTakeHome = currentEarnings - taxFICA - taxFederal;

            System.out.print("\n\tPayroll information" + "\n\t-----------------"
                    + "\n\tEmployee id:  " + employeeID + "\n\tCurrent earnings: $"
                    + formatter.format(currentEarnings) + "\n\tYear-to-date earnings: $"
                    + formatter.format(currentYTD) + "\n\tFICA taxes: $" + formatter.format(taxFICA)
                    + "\n\tFederal income tax withheld: $" + formatter.format(taxFederal)
                    + "\n\tTake home pay check amount: $" + formatter.format(payTakeHome));

            System.out.print("\n\nEnter employee id number: ");
            employeeID = keyboard.nextInt();
            System.out.print("Enter hourly wage: $");
            hourlyWage = keyboard.nextDouble();
            System.out.print("Enter hours worked: ");
            hoursWorked = keyboard.nextDouble();
            System.out.print("Enter number of withholding exemptions: ");
            withExempt = keyboard.nextInt();
            System.out.print(
                    "Enter marital status: [For married, enter m. " + "For single, enter s.] ");
            input = keyboard.next();
            maritalStatus = input.charAt(0);
        }

    }
}