Question

I need to write a Java program.

• Declare and initialize an ArrayList of type Employee. In a while loop, keep initializing objects of type Employee, storing them in the array, and allow the user to enter ID, salary, and leaveDays of the each employee one by one and in one line. Once the user entered a -1, stop initializing new employees, and print "You entered [actual length of array] employees. Thank you!"
• Create a FOR loop that goes through every Employee object in the ArrayList, and calculate their monthly payments, using the calcMonthlyPayment() method.
• Create a second FOR loop that goes through every Employee object in the ArrayList, and set their monthly payments to -1, only if their leaveDays is higher than 21.
• In a third FOR loop, go through every Employee object in the ArrayList, and call their makePayment() method.

For the input ...

1 120000 6 2 50000 25 3 140000 4 4 112000 22 5 130000 4 -1

The output will be...

You added 5 employees! Thank you!

Monthly payment for employee 1 is calculated.

Monthly payment for employee 2 is calculated.

Monthly payment for employee 3 is calculated.

Monthly payment for employee 4 is calculated.

Monthly payment for employee 5 is calculated.

A payment of 10000 was made to employee 1.

A payment of -1 was made to employee 2.

A payment of 11666 was made to employee 3.

A payment of -1 was made to employee 4.

A payment of 10833 was made to employee 5.

Answer 1

import java.util.*;
public class Question{
   public static void main(String[] args) {

       int id = 1,leaveDays;
       int salary;
       int loop_terminator;

       Scanner input=new Scanner(System.in);

       ////ArrayList declaration ////
       ArrayList<Employee> list = new ArrayList<Employee>();

       System.out.println("For the input ...");
       while(true)
       {
           id = input.nextInt();

           ///condition to break the loop///
           if(id == -1)
               break;

           salary = input.nextInt();
           leaveDays = input.nextInt();
           Employee obj = new Employee(id,leaveDays,salary);

           list.add(obj); ////appending the object of Employee in the ArrayList
       }

       int length = list.size(); ///getting length of ArrayList

       System.out.println("Output will be....");
       System.out.println("You added " + length + " employees! Thank you!");
      
       for(int i =0 ;i<length ; i++)
       {
           list.get(i).calcMonthlyPayment();
           System.out.println("Monthly payment for employee " + (i+1) + " is calculated.");
       }

       for(int i =0 ;i<length ; i++)
       {
           System.out.println("A payment of " + list.get(i).makePayment() + " was made to employee " + (i+1));
       }
   }
}

/////Employee class definition///////
class Employee
{
   int id, leaveDays;
   int salary , monthly_payment;

   ///class constructor /////
   Employee(int id, int leaveDays, int salary)
   {
       this.id = id;
       this.leaveDays = leaveDays;
       this.salary = salary;
   }

   ////method to calculate montly payment ////
   public void calcMonthlyPayment()
   {
       if(leaveDays > 21 )
       {
           monthly_payment = -1;
          
       }
       else
       {
          
           monthly_payment = (int) (salary / 12);
       }
   }

   ////method to return payment made to the employee ///
   public int makePayment()
   {
       return monthly_payment;
   }
}