java - 如何使 for 循环从方法中输出数组的正确值

Question

我正在开发一个程序，该程序获取具有给定 ID 号的员工的工资率和工作时间，将它们存储在数组中，并使用一种方法来确定员工的总工资，该工资也将存储在数组中。我的程序可以接受员工的工资率和工时，但是当它输出员工 ID 和相应的总工资时，它返回一组奇怪的字符，例如 [D@1909752.如何让程序正确输出给定员工的总工资？我认为问题出现在方法和将方法传递给最终的 for 循环之间，以及我的方法将 int 乘以 double 的事实，但我不知道从这里该怎么做。感谢您的帮助。我的代码如下。

import java.util.Scanner;

class Payroll
{
   public static void main(String[] args)
   {
      int[] employeeId = {5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 7580489};

      int[] hours = new int[7];

      double[] payRate = new double[7];

      for(int counter = 0; counter< 7; counter++)
      {
         Scanner keyboard = new Scanner(System.in);
         System.out.println("Enter the hours worked by employee #" + employeeId[counter]);
         hours[counter] = keyboard.nextInt();

            if (hours[counter] < 0)
            {
               System.out.println("Error: hours cannot be negative. The program will now close.");
               System.exit(0);
            }  
            else
            {
               continue;
            }
      } 

      for(int counter1 = 0; counter1< 7; counter1++)
      {
         Scanner keyboard = new Scanner(System.in);
         System.out.println("Enter the payrate of employee #" + employeeId[counter1]);
         payRate[counter1] = keyboard.nextDouble();

            if (payRate[counter1] < 6.0)
            {
               System.out.println("Error: payrate must be above 6.0. The program will now close.");
               System.exit(0);
            }  
            else
            {
               continue;
            }
      } 

      for (int counter2 = 0; counter2 < 7; counter2++)
      {
         System.out.println("The gross pay for employee #" + employeeId[counter2] + " is " + wages(employeeId, hours, payRate));
      }
   } 

   public static double[ ] wages(int[] employeeId, int[] hours, double[] payRate)
   {
      double[] wages = new double[7];

         for(int counter2 = 0; counter2< 7; counter2++)
         {
            wages[counter2] = hours[counter2] * payRate[counter2];
         }

      return wages;
   }

}

Answer 1

字符串[D@1909752是toString()应用于double数组的默认输出。在声明中

    System.out.println("The gross pay for employee #" + employeeId[counter2] + " is " + wages(employeeId, hours, payRate));

方法wages返回一个double数组，并且你告诉程序打印整个数组，而不是一个特定元素。如果您想打印所有七个元素，则需要使用循环或 lambda 单独打印每个元素。