Question

我的班级作业如下： “编写一个使用以下数组作为字段的Payroll类：

employeeID - 包含员工识别号码的七个整数数组。应使用以下数字初始化该数组： 5658845 4520125 7895122 8777541 8451277 1302850 7580489
小时 - 一组七个整数，用于保存每位员工的工作小时数。
payRate - 每个员工每小时工资率的七个双打数组。
工资 - 用于支付每位员工工资总额的七个双打数字。

该类应通过下标关联每个数组中的数据。例如，hours数组的元素0中的数字应该是员工工作的小时数其标识号存储在employeeID数组的元素0中。同一员工的工资率应存储在payRate数组的元素0中。除了适当的访问器和mutator方法，该类应该有一个接受员工识别号码的方法作为参数并返回该员工的总薪酬。

我无法从我创建的程序中传递值。这是班级：

public class moduleArray2
{
   final int NUM_EMPLOYEES = 7;
   int[] employeeID = {5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 7580489};
   int[] hours = new int[NUM_EMPLOYEES];
   double[] payRate = new double[NUM_EMPLOYEES];
   double[] wages = new double[NUM_EMPLOYEES];
   int employee = 0;
   double wage = 0;


   // setHours method
   public void setHours(int[] time)
   {
      time = hours;

   }

   // setPayRate method
   public void setPayRate(double[] pay)
   {
      pay = payRate;

   }

    // setWages method
   public void setWage(int[] time, int[] pay)
   {
      for (int index = 0; index < NUM_EMPLOYEES; index++)
         wages[index] = time[index] * pay[index];

   }

   //getEmployeeID method
   public int getEmployeeID(int index)
   {

      return employee;

   }   

   // getWage method
   public double getWage(int index)
   {


      return wage;

   }

}

该程序应显示每个员工编号，并要求用户输入该员工的工时和工资率。然后它应显示每个员工的身份证号码和工资总额。当我运行程序时，它只是将所有内容列为零值，包括员工ID号。

import java.util.Scanner;

public class moduleArrayDemo2
{
   public static void main(String[] args)
   {
      final int NUM_EMPLOYEES = 7;
      int[] time = new int[NUM_EMPLOYEES];
      double[] pay = new double[NUM_EMPLOYEES];

      // Create new Scanner object
      Scanner keyboard = new Scanner(System.in);

      // Create employee object
      moduleArray2[] employee = new moduleArray2[NUM_EMPLOYEES];

      // A loop that creates objects for each element
      for (int i = 0; i < employee.length; i++)
         employee[i] = new moduleArray2();


      for (int i = 0; i < employee.length; i++)
      {
         System.out.print("Enter hours for Employee #" + employee[i].getEmployeeID(i) +
                           ": ");
         time[i] = keyboard.nextInt();
         employee[i].setHours(time);

         System.out.print("Enter how much Employee #" + employee[i].getEmployeeID(i) +
                          " makes per hour: ");
         pay[i] = keyboard.nextDouble();
         employee[i].setPayRate(pay);

      }

      for (int i = 0; i < employee.length; i++)
      {
         System.out.println("Employee #" + employee[i].getEmployeeID(i) + 
                            " Wages: " + employee[i].getWage(i));

      }    

   }

 }

我可以在一个简单的程序中执行数组，我可以使用程序创建类，这些程序可以创建这些类的实例。班上的阵列......我觉得完全迷失了。如何引用类中的数组以获取程序本身的值？任何反馈或建议将不胜感激！

Answer 1

首先，你搞乱了访问器方法参数，它们的实际值和访问过的对象。

class ModuleArray2
    int[] employeeID = {5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 7580489};
    int NUM_EMPLOYEES = employeeID.length; // I assume you've got it defined somewhere

    int[] hours = new int[NUM_EMPLOYEES];
    double[] payRate = new double[NUM_EMPLOYEES];
    double[] wages = new double[NUM_EMPLOYEES];

    // setHours method - will reassign the whole array of `hours` with the provided argument `time` ; I'm leaving this method with a signature that you have provided just to have a place to put my comment on it
    public void setHours(int[] time) {
        hours = time;
        // time = hours; // this is wrong - it would assign class field value to the temporary argument variable `time`, and then just throw it away (since `time` in this scope is temporary)
    }

    // setHours method - will set working hours in one of an array `hours` elements specified by the provided index - number of an employee it refers to
    public void setHours(int employeeNumber, int workedHours) {
        hours[employeeNumber] = workedHours;
    }

    // setPayRate method - same as above
    public void setPayRate(int employeeNumber, double payRate) {
        payRates[employeeNumber] = payRate;
    }

    // setWage method - same as above
    public void setWage(int employeeNumber, double wage) {
        wages[employeeNumber] = wage;
    }

    // getWage method - will return the wage for employee given by an index in array number
    public double getWage(int employeeNumber) {
        return wages[employeeNumber];
    }

    //getEmployeeID method - will return an ID of employee given by an index in array number
    public int getEmployeeID(int employeeNumber) {
        return employeeID[employeeNumber];
    }

    //getEmployeeIndexFromID method - will return the index of employee given by his ID number - this is inverse function of the function 'getEmployeeID'
    public int getEmployeeIndexFromID(int employeeID) {
        int index;
        // search implementation goes here
        // you should try to write it on your own
        return index;
    }
}

Answer 2

基于Tax程序，将total变量更改为一个数组，该数组接受用户的5个double值，然后将其传递给tax方法以获取总额的税。

如何创建一个包含数组的类，然后将值传递给程序？

2 个答案: