Suppose the weekly hours for all employees are stored in a two-dimensional array

Question

Suppose the weekly hours for all employees are stored in a two-dimensional array. Each row records an employee’s n-day work hours with n columns where n 1 and n 7 representing the number of days in a week that these employees work. For example, the table shown below represents an array that stores the work hours of eight employees for 7 days in a week. Write a program that takes in as inputs, the number of employees and the number of working days in a week. Then it takes in all the Employee information (name and number of daily hours worked). This program should display employees and their total hours worked in a week in decreasing order of the total hours.

Explanation / Answer

Complete Program:

import java.util.Scanner;
public class Employee
{
public static void main(String[] args)
{
  Scanner input = new Scanner(System.in);
  // declare variables for number of employees and number of working days
  int numberOfEmployees;
  int numberOfWorkingdays;
  
  // Prompt and accept number of employees
  System.out.print("Enter the number of employees: ");
  numberOfEmployees = input.nextInt();
  
  // Prompt and accept number of working days
  System.out.print("Enter the number of working days: ");
  numberOfWorkingdays = input.nextInt();

  //Loop that runs until a valid number of working days is given. number of working days should be >0 and <8
  while(numberOfWorkingdays < 0 || numberOfWorkingdays > 7)
  {
   System.out.println("Enter the valid number of working days (1-7): ");
   numberOfWorkingdays = input.nextInt();
  }
  
  // Accept array to store name and number of working hours
  String[] employees = new String[numberOfEmployees];
  int[][] workingHours = new int[numberOfEmployees][numberOfWorkingdays];
  
  // Accept name and number of working hours for each day
  for(int i = 0; i < numberOfEmployees; i++)
  {
   System.out.print(" Enter the name of the employee: ");
   employees[i] = input.next();
   
   System.out.print("Enter the working hours for " + numberOfWorkingdays + " days: ");
   for(int j = 0; j < numberOfWorkingdays; j++)
    workingHours[i][j] = input.nextInt();
  }    
  
  System.out.printf(" %-15s%12s ", "Name", "Hours");
  System.out.println("----------------------------");
  for(int i = 0; i < numberOfEmployees; i++)
  {
   System.out.printf("%-15s%12d ", employees[i], getTotalWorkingHours(workingHours[i]));
  }    
}


public static int getTotalWorkingHours(int[] hours)
{
  int totalHours = 0;
  
  for(int i = 0; i < hours.length; i++)
   totalHours += hours[i];
  
  return totalHours;
}
}

Sample Output:

Enter the number of employees: 4
Enter the number of working days: 8
Enter the valid number of working days (1-7):4

Enter the name of the employee: Jason
Enter the working hours for 4 days: 8 7 9 6

Enter the name of the employee: Kevin
Enter the working hours for 4 days: 8 7 6 7

Enter the name of the employee: Nygel
Enter the working hours for 4 days: 8 8 8 8

Enter the name of the employee: Jasper
Enter the working hours for 4 days: 8 8 8 8

Name                  Hours
----------------------------
Jason                    30
Kevin                    28
Nygel                    32
Jasper    32

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