Java输出故障

Question

我创建了一个生成工资存根的目标问题.该程序不会生成任何常规的薪酬输出,而只是说"$ 0.00".无法弄清楚问题.

预计:"常规时间:40注册率:15.50美元注册支付:620.00美元"
我的代码:"常规时间:40注册率:15.50美元注册支付:0.00美元"

我试图重新格式化它,但我仍然遇到这个错误.

public class Activity2PayStub {

    public static final double OVERTIME_FACTOR = 1.5;
    public static final double FEDERAL_FACTOR = 0.2;
    public static final double SOCIAL_FACTOR = 0.1;

    private String employeeName;
    private String employeeSSN;
    private int regularH;
    private int overtimeH; 
    private double payrateH; 
    private double regularPay = (regularH * payrateH);
    private double overtimePR = payrateH * (OVERTIME_FACTOR);
    private double overtimePay = overtimePR * overtimeH;
    private double grossPay = regularPay + overtimePay; 
    private double ssTax = grossPay * (SOCIAL_FACTOR);
    private double federalTax = (grossPay - ssTax) * (FEDERAL_FACTOR);
    private double netPay = grossPay - (federalTax + ssTax);

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        Activity2PayStub a2ps = new Activity2PayStub();

        a2ps.getInput(keyboard);
        a2ps.calculate();
        a2ps.printPayStub();
    }

    /** @param keyboard command-line arguments. */ 
    public void getInput(Scanner keyboard) {
        System.out.print("Enter employee name: ");
        employeeName = keyboard.nextLine();
        System.out.print("Enter employee SNN (incl. hyphens: ");
        employeeSSN = keyboard.nextLine();
        System.out.print("Enter number of regular hours worked: ");
        regularH = keyboard.nextInt();
        System.out.print("Enter number of overtime hours worked: ");
        overtimeH = keyboard.nextInt();
        System.out.print("Enter hourly pay rate : ");
        payrateH = keyboard.nextDouble();  
    }

    public void calculate() {
    }

    /** simply prints. */
    public void printPayStub() {
        Scanner input = new Scanner(System.in);

        System.out.println("_______________________"
            + "_____________________________________________");

        String format = "Name: %-37s SSN: %-11s\n";
        System.out.printf(format, employeeName, employeeSSN);

        format = "Regular Hours: %-8d Reg Rate: $%-8.2f Reg Pay: $%-8.2f\n";
        System.out.printf(format, regularH, payrateH, regularPay);

        format = "Overtime Hours: %-8dOT Rate: $%-8.2f  OT Pay: $%-8.2f\n";
        System.out.printf(format, overtimeH, overtimePR, overtimePay);

        format = "Gross Pay: $%-8.2f\n";
        System.out.printf(format, grossPay);

        format = "SS Withholding: $%-8.2f\n";
        System.out.printf(format, ssTax);

        format = "Federal Tax: $%-8.2f\n";
        System.out.printf(format, federalTax);

        format = "Net Pay: $%-8.2f\n";
        System.out.printf(format, netPay);

        System.out.println("________________________"
        + "__________________________________________");
    }
}

Answer 1

这是因为计算是在实例创建时执行的.您应该将计算移动到该calculate()方法.

该JLS章8.3.2证实了这一点:

如果声明符用于实例变量(即非静态字段),则计算变量初始化程序,并在每次创建类的实例时执行赋值