Question

Create a Java Program that calculates payroll for N number of workers in a company Using Arrays and Methods

Pass Elements and Pass arrays

            Array length = size of the array.

• Input :- First Name, MI, Last Name, Id, Hours Worked, Rate(1^st method )
• Constants :- State Tax, Federal Tax, Union Fees(2^nd Method)

Calculate The following using different methods

• Gross income(3^rd Method)
• State Tax(4^th Method)
• Federal Tax(5^th Method)
• Union Fees(6^th Method)
• Net Income(7^th Method)

Out Put (Formatted)(8^th Method)

(FirstName[i] + "\t" + MiddleName[i] + "\t" + LastName[i] +"\t" +
    Rate[i] +"\t" + HoursWorked[i] +"\t"+ Overtime[i]+"\t"+ GrossIncome[i]+"\t"+
     StateTax[i]+"\t"+ FedTax[i]+"\t"+ UnionFees[i]+"\t"+ Net[i]);

• Send to file
• Send to Screen

Answer 1

// Java program to input details of employees of a company and calculate and display their payroll details
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class CompanyPayroll {
  
   // variables to store the tax value
   public static double stateTaxPercent, federalTaxPercent, unionFeePercent;

   // method to input the details of the employees
   public static void inputDetails(Scanner scan, String firstName[], String middleName[], String lastName[], String id[], double rate[], double hoursWorked[])
   {
       for(int i=0;i<firstName.length;i++)
       {
           System.out.println("Employee "+(i+1)+": ");
           System.out.print("First name: ");
           firstName[i] = scan.next();
           System.out.print("Middle name: ");
           middleName[i] = scan.next();
           System.out.print("Last name: ");
           lastName[i] = scan.next();
           System.out.print("ID: ");
           id[i] = scan.next();
           System.out.print("Pay rate: ");
           rate[i] = scan.nextDouble();
           System.out.print("Hours worked: ");
           hoursWorked[i] = scan.nextDouble();
       }
   }
  
   // method to input the tax values (eg- 2% = 0.02 as input)
   public static void inputConstants(Scanner scan)
   {
       System.out.print("Enter federal tax percent: ");
       federalTaxPercent = scan.nextDouble();
       System.out.print("Enter state tax percent: ");
       stateTaxPercent = scan.nextDouble();
       System.out.print("Enter union fees percent: ");
       unionFeePercent = scan.nextDouble();
   }

   //method to calculate gross income and overtime for employees
   public static void calGrossIncome(double rate[], double hoursWorked[], double grossIncome[], double overTime[])
   {
       for(int i=0;i<rate.length;i++)
       {
           if(hoursWorked[i] > 40)
           {
               overTime[i] = (hoursWorked[i]-40)*1.5*rate[i];
               grossIncome[i] = 40*rate[i] + overTime[i];
           }else
           {
               overTime[i] = 0;
               grossIncome[i] = hoursWorked[i]*rate[i] + overTime[i];
           }
       }
   }
  
   // method to calculate the state tax for employees
   public static void calStateTax(double grossIncome[], double stateTax[])
   {
       for(int i=0;i<stateTax.length;i++)
           stateTax[i] = grossIncome[i]*stateTaxPercent;
   }
  
   // method to calculate federal tax for employees
   public static void calFederalTax(double grossIncome[], double federalTax[])
   {
       for(int i=0;i<federalTax.length;i++)
       {
           federalTax[i] = grossIncome[i]*federalTaxPercent;
       }
   }
  
   // method to calculate union fees for employees
   public static void calUnionFees(double grossIncome[], double unionFees[])
   {
       for(int i=0;i<unionFees.length;i++)
           unionFees[i] = grossIncome[i]*unionFeePercent;
   }
  
   // method to calculate net income of employees
   public static void calNetIncome(double grossIncome[], double stateTax[], double federalTax[], double unionFees[], double netIncome[])
   {
       for(int i=0;i<netIncome.length;i++)
           netIncome[i] = grossIncome[i] - stateTax[i] - federalTax[i] - unionFees[i];
   }
  
   // method to output the payroll details of employees on screen and in file
   public static void output(String id[],String firstName[], String middleName[], String lastName[], double rate[],
           double hoursWorked[], double overTime[], double grossIncome[], double stateTax[], double federalTax[], double unionFees[], double netIncome[]) throws FileNotFoundException
   {
       PrintWriter writer = new PrintWriter("companyPayroll.txt");
       System.out.printf("%-20s%-20s%-20s%-20s%-15s%-15s%-15s%-15s%-15s%-15s%-15s%-15s","ID","First Name","Middle Name","Last Name","Pay Rate","Hours Worked",
               "Overtime","Gross Income","State tax","Federal Tax","Union Fees","Net Income");
       writer.printf("%-20s%-20s%-20s%-20s%-15s%-15s%-15s%-15s%-15s%-15s%-15s%-15s","ID","First Name","Middle Name","Last Name","Pay Rate","Hours Worked",
               "Overtime","Gross Income","State tax","Federal Tax","Union Fees","Net Income");
       for(int i=0;i<firstName.length;i++)
       {
           System.out.printf("\n%-20s%-20s%-20s%-20s%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f",id[i],firstName[i],middleName[i],lastName[i],rate[i],hoursWorked[i],
                   overTime[i],grossIncome[i],stateTax[i],federalTax[i],unionFees[i],netIncome[i]);
           writer.printf("\n%-20s%-20s%-20s%-20s%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f%-15.2f",id[i],firstName[i],middleName[i],lastName[i],rate[i],hoursWorked[i],
                   overTime[i],grossIncome[i],stateTax[i],federalTax[i],unionFees[i],netIncome[i]);
       }
       writer.close();
   }
   public static void main(String[] args) throws FileNotFoundException {

       int n;
       String firstName[], middleName[], lastName[], id[];
       double rate[], hoursWorked[], overtime[], grossIncome[], stateTax[], fedTax[], unionFees[], net[];
       Scanner scan = new Scanner(System.in);
       // input of number of employees
       System.out.print("Enter number of employees: ");
       n = scan.nextInt();
       scan.nextLine();
       if(n> 0)
       {
           firstName = new String[n];
           lastName = new String[n];
           middleName = new String[n];
           id = new String[n];
          
           rate = new double[n];
           hoursWorked = new double[n];
           overtime = new double[n];
           grossIncome = new double[n];
           overtime = new double[n];
           stateTax = new double[n];
           fedTax = new double[n];
           unionFees = new double[n];
           net = new double[n];
          
           inputDetails(scan, firstName, middleName, lastName, id, rate,hoursWorked);
           inputConstants(scan);
           calGrossIncome(rate, hoursWorked, grossIncome, overtime);
           calStateTax(grossIncome, stateTax);
           calFederalTax(grossIncome, fedTax);
           calUnionFees(grossIncome , unionFees);
           calNetIncome(grossIncome, stateTax, fedTax, unionFees, net);
          
           output(id,firstName, middleName,lastName,rate, hoursWorked,overtime, grossIncome,stateTax, fedTax, unionFees, net);
       }else
           System.out.println("Number of employees > 0");
       scan.close();

   }

}
//end of program

Output:

Output file: