制作一个 SIZE = 10 个员工对象的数组 [重复]

Question

有没有人可以指导我如何创建这些员工的数组？数组设置为常量 SIZE=10；这是我的员工类和我尝试过的带有数组的驱动程序。另外，我知道大部分输出都是空白的（员工姓名、身份证等），因为我已经知道如何编写它，但到目前为止还没有。此外，类名“Employee 1”中的“1”仅存在，因为我已经在员工下保存了另一个文件。正如您很可能会说的那样，对 java 来说非常陌生。谢谢

   class Employee1{

  //variables
 private  String name;
 private double grossPay;

   // This is the constructor of the class Employee
   public Employee1(String EmpName)
   {
      name = EmpName;
   }
    //calculates gross pay and returns 
    public double weeklyPay(double hoursWorked, double hourlyRate)
    { 

     double timeAndHalf = (hourlyRate/2.0)+hourlyRate;
     double dblOvtHours;
     double dblOvtPay;
     double regHours;
     double ovtHours;

    if (hoursWorked <= 40) 
        {
        grossPay = hoursWorked*hourlyRate;
        }

        else if (hoursWorked > 40 && hoursWorked <= 60)
        {
        ovtHours = hoursWorked-40; 
        regHours = 40;
        grossPay = (ovtHours*timeAndHalf) + (regHours*hourlyRate);
        }

        else if (hoursWorked > 60)
        {
         ovtHours = 20; 
         regHours = 40;
         dblOvtHours = hoursWorked - 60;
         dblOvtPay = hourlyRate * 2;
         grossPay = (dblOvtPay*dblOvtHours) + (timeAndHalf * ovtHours) 
     +(regHours * hourlyRate);
        }

           return grossPay; 
   }/////////////////////////////////////////////////



   /* Print the Employee details */
   public String toString()
   {
       return "Employee Report\n" + "Name :" + "\nID number :" 
+ "\nHours Worked" + "\nHourly Rate : " +"\nGross pay: " + grossPay ;
   }
 }

我的驱动类：

import java.util.Scanner;
public class EmployeeDriver{

public static void main(String args[]){

   // Invoking methods for each object created
  final double hourlyRatef = 10.25;
  double hoursWorkedf, wPay; 
  double grossPayf = 0.0;

  Scanner input = new Scanner(System.in);

  System.out.print("Please enter the number of hours work: ");

  hoursWorkedf = input.nextDouble();


 //array that does not work //

  Employee1 emp = new Employee1();
  emp[0] = new Employee (); 

  /* invoke weeklyPay() method */
  grossPayf=  emp.weeklyPay(hoursWorkedf,hourlyRatef);

  // invoke printEmployee() method
  System.out.println (emp.toString());

  }
}

Answer 1

您正在做的是创建单个对象，而不是数组。数组看起来像这样：

final int SIZE = 10;
Employee1[] emp = new Employee1[SIZE];

那么数组的每个成员都必须像这样实例化：

emp[0] = new Employee1();

Answer 2

public static final int SIZE = 10;

public static void main(String[] args) {
    Employee1[] employees = new Employee1[SIZE];
}

Answer 3

根据Java doc：

An array is a container object that holds a fixed number of values of a single type.

在您的情况下，您正在实例化一个对象 (Employee1 emp) 并将其设置为索引 0。其他指标呢？您需要运行一个循环并询问用户新员工并将其插入到适当的索引（0-> 1 ->2 等）。

您的构造函数还接受您还应该提供并在toString 方法中打印的员工姓名。我做了一些更改，最终代码如下所示：

public class Employee1 {
    //variables
    private  String name;
    private double grossPay;

    // This is the constructor of the class Employee
    public Employee1(String EmpName)
    {
        name = EmpName;
    }
    //calculates gross pay and returns
    public double weeklyPay(double hoursWorked, double hourlyRate)
    {

        double timeAndHalf = (hourlyRate/2.0)+hourlyRate;
        double dblOvtHours;
        double dblOvtPay;
        double regHours;
        double ovtHours;

        if (hoursWorked <= 40)
        {
            grossPay = hoursWorked*hourlyRate;
        }

        else if (hoursWorked > 40 && hoursWorked <= 60)
        {
            ovtHours = hoursWorked-40;
            regHours = 40;
            grossPay = (ovtHours*timeAndHalf) + (regHours*hourlyRate);
        }

        else if (hoursWorked > 60)
        {
            ovtHours = 20;
            regHours = 40;
            dblOvtHours = hoursWorked - 60;
            dblOvtPay = hourlyRate * 2;
            grossPay = (dblOvtPay*dblOvtHours) + (timeAndHalf * ovtHours)
                    +(regHours * hourlyRate);
        }

        return grossPay;
    }/////////////////////////////////////////////////



    /* Print the Employee details */
    public String toString()
    {
        return "Employee Report\n" + "Name :" + name + "\nID number :"
                + "\nHours Worked" + "\nHourly Rate : " +"\nGross pay: " + grossPay ;
    }
}

主要是：

public static void main(String[] args) {
    final double hourlyRatef = 10.25;
    double hoursWorkedf, wPay;
    double grossPayf = 0.0;

    Scanner input = new Scanner(System.in);
    System.out.println("How many employees you want to enter: ");
    final int empSize = input.nextInt();
    Employee1[] employees = new Employee1[empSize];

    for (int i = 0; i <empSize; i++) {
        System.out.print("Please enter the number of hours work: ");
        hoursWorkedf = input.nextDouble();
        employees[0] = new Employee1("John");
        grossPayf =  employees[0].weeklyPay(hoursWorkedf,hourlyRatef);
        System.out.println (employees[0].toString());
    }
}

注意：我只做了最少的更改以使程序正常运行。您可以在代码中改进许多其他方面。程序运行如下：

How many employees you want to enter: 2 Please enter the number of hours work: 11 Employee Report Name :John ID number : Hours Worked Hourly Rate : Gross pay: 112.75 Please enter the number of hours work: 10 Employee Report Name :John ID number : Hours Worked Hourly Rate : Gross pay: 102.5

Answer 4

新代码

 public static void main(String[] args) {

final int SIZE=10;
final double hourlyRatef = 10.25;
double hoursWorkedf, wPay;
double grossPayf = 0.0;
String name = "Void";

Scanner input = new Scanner(System.in);
// System.out.println("How many employees you want to enter: ");
// final int empSize = input.nextInt();
Employee1[] employees = new Employee1[SIZE];

for (int i = 0; i <SIZE; i++) 
{
    System.out.print("Please enter the number of hours work: ");
    hoursWorkedf = input.nextDouble();
    System.out.print("Please enter employee name: ");
    employees[i] = new Employee1(name);
    grossPayf =  employees[i].weeklyPay(hoursWorkedf,hourlyRatef);
    System.out.println (employees[i].toString());