java - 如何修复返回值未显示在我的方法之一上的问题

Question

我尝试从 4 个方法中的两个返回值，以便我可以在 final方法上使用打印输出。返回值没有显示，我的结果是 null 和 0.0。

import java.util.*;
public class payroll {
    static Scanner console = new Scanner(System.in);
    static double hour;
    static String employee; 
    static double rate;
    static double gross_pay;
    static double tax;
    static double deduction;
    static double net_pay;
    public static void main(String[] args) {
            name();
            number(hour, rate, tax, gross_pay, deduction, net_pay);
            print();
    }
    public static String name() {
            System.out.print("Please enter employee's name: ");
            String employee = console.nextLine();

            return employee;

    }
    public static double[] number(double hour, double rate, double tax, double gross_pay, double deduction, double net_pay) {

            double[] pay = new double[7];
            pay[1] = hour;
            pay[2] = rate;
            pay[3] = tax;
            pay[4] = gross_pay;
            pay[5] = deduction;
            pay[6] = net_pay;

            System.out.print("Please enter number of hours worked: ");
            pay[1] = console.nextDouble();

            System.out.print("Please enter rate of pay: ");
            pay[2] = console.nextDouble();


            System.out.print("Please enter federal tax rate: ");
            pay[3] = console.nextDouble();

            pay[4]= hour*rate;
            pay[5] = gross_pay*tax;
            pay[6] = gross_pay-deduction;


            return pay;

    }
    public static void print() {
            System.out.printf("Employee's Name: " + employee + "\n" + 
                 "Hours Worked: " + hour + "\n" +
                 "Hourly Pay: " + rate + "\n" + 
                 "Gross Pay: " + gross_pay + "\n" +
                 "Tax Deducted: " + deduction + "\n" +
                 "Net Pay: " + net_pay);

    }

}

预期结果是员工的姓名和方法中进行的计算。

Answer 1

这里的问题是您没有将返回值分配给任何东西。

通常你会做类似的事情

employee = name();

但要提到的其他一点是，您将 employee 等声明为字段，因此可以通过方法直接访问它们

例如

public static void name() {  // do not return any thing
        System.out.print("Please enter employee's name: ");

        // do not de-declare, just use the field
        employee = console.nextLine();

}

这使用起来是正确的，因为您没有将任何参数传递给 print 并且打印出字段的值