需要帮助调用其他类的方法

Question

我还是 java 的新手，我正在努力让这个程序为我的任务工作。

这是问题：

Jeff 在您附近经营一家当地零售店。 他与您签约创建一个交互式应用程序，以帮助他提高员工工资。 创建一个名为 Details 的 class ，它将包含员工 ID 号、名字、姓氏和薪水的 get 和 set 方法。 包括一个名为 getUpdatedSalary() 的方法，它将员工的薪水提高 10%。 在您的主要 class 中包含一个名为printDetails()的 static 方法，该方法将生成员工详细信息报告，还包括一个 static 方法，名为salaryDeductions()

（我知道我没有做过salaryDeductions方法）

它正确输出所有内容，直到incAmt和newSAl ，这两个它只是说 0，

我有两个课程，StaffSalaries 和 Details。 这是我的代码：

员工薪水.java

package staffsalaries;

import javax.swing.JOptionPane;


public class StaffSalaries {

    public static void printDetails(Details e ){

     JOptionPane.showMessageDialog(null, "Employee ID Number: " + e.getIdNum()
     + "\nEmployee First Name: " + e.getName()
     + "\nEmployee Surname: " + e.getSurname()
     + "\nOrigonal Salary: R" + e.getSalary()
     + "\nIncreass on Salary: R" + e.getincAmt()
     + "\nTotal Salary: R" + e.getnewSal());



    }

    public static void main(String[] args) {

        //Variables
        String name, surname;
        int idNum;
        double salary, incAmt = 0, newSal = 0;

        //Input
        idNum = Integer.parseInt(JOptionPane.showInputDialog(null, "Please enter employee ID number."));
        name = JOptionPane.showInputDialog(null, "Please enter your first name.");
        surname = JOptionPane.showInputDialog(null, "Please enter your surname");
        salary = Double.parseDouble(JOptionPane.showInputDialog(null, "Pleasse enter the salary to be increased."));

        Details e =new Details (idNum, name, surname, salary, incAmt, newSal);
        e.getUpdatedSalary();
        printDetails();

    }

}

详情.java

package staffsalaries;
public class Details {

    public void getUpdatedSalary () {

        incAmt = salary * 0.1;
        newSal = incAmt + salary;

    }

    //Attributes
    private String name, surname;
    private int idNum;
    private double salary, incAmt, newSal;

    //Constructor
    public Details (int idNum, String name, String surname, double salary, double incAmt, double newSal) {
       this.idNum = idNum;
       this.name = name;
       this.surname = surname;
       this.salary = salary;
       this.incAmt = incAmt;
       this.newSal = newSal;
    }

    //Gettrs
    public String getName() {
        return name;
    }

    public String getSurname() {
        return surname;
    }

    public int getIdNum() {
        return idNum;
    }

    public double getSalary() {
        return salary;
    }

    public double getincAmt() {
        return incAmt;
    }

    public Double getnewSal() {
        return newSal;
    }

    //Setters
    public void setName(String name) {
        this.name = name;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public void setIdNum(int idNum) {
        this.idNum = idNum;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public void setincAmt(double incAmt) {
        this.incAmt = incAmt;
    }

    public void setnewSal(double newSal) {
        this.newSal = newSal;
    }
}

Answer 1

将您的 getUpdatedSalary 方法更改为此

public void getUpdatedSalary(double salary, double incAmt, double newSal) {
  incAmt = salary * 0.1;
  newSal = incAmt + salary; 
}

并调用此方法getUpdatedSalary(salary, incAmt, newSal); 前

printDetails(idNum, name, surname, salary, incAmt, newSal)

Answer 2

什么时候 incAmt 应该设置为除 0 以外的任何值？ 我唯一能看到的地方是 getUpdatedSalary() ，它似乎从未被调用过。

使用 getUpdatedSalary() 返回值和更改对象的变量对我来说似乎不是最好的主意。 也许试试这个：

private double updatedSalary;
public void setUpdatedSalary () {

    incAmt = salary * 0.1;
    newSal = incAmt + salary;
    updatedSalary = incAmt + newSal;
}

public double setUpdatedSalary () {

    return updatedSalary;
}

在 printDetails 中：

public static void printDetails(int idNum, String name, String surname, double salary, double incAmt, double newSal){

    Details e = new Details (idNum, name, surname, salary, incAmt, newSal);
    e.setIdNum(idNum);
    e.setName(name);
    e.setSurname(surname);
    e.setSalary(salary);
    e.setincAmt(incAmt);
    e.setnewSal(newSal);
    e.setUpdatedSalary();

 JOptionPane.showMessageDialog(null, "Employee ID Number: " + e.getIdNum()
         + "\nEmployee First Name: " + e.getName()
         + "\nEmployee Surname: " + e.getSurname()
         + "\nOrigonal Salary: R" + e.getSalary()
         + "\nIncreass on Salary: R" + e.getincAmt()
         + "\nTotal Salary: R" + e.getnewSal());
}

Answer 3

记住这些事情。 方法只有在被调用时才会执行。 您还没有调用 getUpdatedSalary() 方法。 试着弄清楚你会在哪里调用它。

此外，代码将使用您定义当前方法的方式，但请查看返回类型，您真的需要返回该值吗？

public static void printDetails(Details e ){
     JOptionPane.showMessageDialog(null, "Employee ID Number: " + e.getIdNum()
     + "\nEmployee First Name: " + e.getName()
     + "\nEmployee Surname: " + e.getSurname()
     + "\nOrigonal Salary: R" + e.getSalary()
     + "\nIncreass on Salary: R" + e.getincAmt()
     + "\nTotal Salary: R" + e.getnewSal());
}

还

     salary = Double.parseDouble(JOptionPane.showInputDialog(null, "Pleasse enter the saalary to be increased."));
Details e =new Details (idNum, name, surname, salary, incAmt, newSal);
e.getUpdatedSalary();

这很难解释，但你应该弄清楚你为什么需要这样做。