是什么导致了我在尝试创建对象时遇到的错误

Question

我正在尝试为创建工资单存根的类编写一个程序。我已经在网上查看了工作，我正在尝试创建自己的版本，但是我一直收到围绕我的main((是什么的错误，并且它无法正常运行。

我尝试重新组织代码、创建新文件和重命名内容，但仍然出现以下异常：

"Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    No enclosing instance of type Employee is accessible. Must qualify the allocation with an enclosing instance of type Employee (e.g. x.new A() where x is an instance of Employee).
at Employee.main(Employee.java:8)

我希望能够在我的代码中输入这些值：

import java.util.Scanner;
import java.util.*;
public class Employee{
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        PayStub data = new PayStub();
        System.out.println("Enter name: ");
        data.setName(input.next());
        System.out.println("Enter address: ");
        data.setAddress(input.next());
        System.out.println("Enter SSN: ");
        data.setSSN((input.next()));
        System.out.println("Number of hours: ");
        data.setHoursWorked(Double.parseDouble(input.next()));
        System.out.println("Enter hourly rate: ");
        data.setHourlyPayRate(Double.parseDouble(input.next()));
        input.close();
    }
}
public class PayStub {
    private String name;
    private double hoursWorked;
    private double hourlyRate;
    private double fedTaxRate;
    private double stateTaxRate;
    private String address;
    private String phone;
    private String SSN;
    public PayStub() {
    }
    public PayStub(String n, double w, double p) {
        this.name = n;
        this.hoursWorked = w;
        this.hourlyRate = p;
    }
    public double grossPay(double hr, double hw) {
        double grossPay = (hourlyRate * hoursWorked);
        return grossPay;
    }
    public void setFedTax(double fedTaxRate) {
        this.fedTaxRate = fedTaxRate;
    }
    public double getFedTax() {
        return fedTaxRate;
    }
    public void setStateTax(double stateTaxRate) {
        this.stateTaxRate = stateTaxRate;
    }
    public double getStateTax() {
        return stateTaxRate;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getHoursWorked() {
        return hoursWorked;
    }
    public void setHoursWorked(double hoursWorked) {
        this.hoursWorked = hoursWorked;
    }
    public double getHourlyPayRate() {
        return hourlyRate;
    }
    public void setHourlyPayRate(double hourlyRate) {
        this.hourlyRate = hourlyRate;
    }
    public String getAddress(){
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getPhone(){
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getSSN() {
        return SSN;
    }
    public void setSSN(String SSN) {
        this.SSN = SSN;
    }
}

Answer 1

最简单的

解决方法是将公共类PayStub移动到名为 PayStub.java 的文件。

您可以将PayStub声明为静态类，使其成为Employee的嵌套类，但没有理由这样做，因为PayStub不是一种员工类型，而是员工拥有的东西。这是承包商可能拥有的东西，等等...所以你想把它拆分成它自己的文件，因为它是一个可重用的类。