PayrollTester.java

abstract class Employee {
    private int employeeNumber;

    public Employee(int employeeNumber) {
        this.employeeNumber = employeeNumber;
    }

    public int getEmployeeNumber() {
        return employeeNumber;
    }

    public abstract double calculatePay();
}

class SalariedEmployee extends Employee {
    private double salary;

    public SalariedEmployee(int employeeNumber, double salary) {
        super(employeeNumber);
        this.salary = salary;
    }

    @Override
    public double calculatePay() {
        // Assuming salary is paid bi-monthly
        return salary / 2;
    }
}

class HourlyEmployee extends Employee {
    private double hourlyRate;
    private int hoursWorked;

    public HourlyEmployee(int employeeNumber, double hourlyRate, int hoursWorked) {
        super(employeeNumber);
        this.hourlyRate = hourlyRate;
        this.hoursWorked = hoursWorked;
    }

    @Override
    public double calculatePay() {
        if (hoursWorked <= 40) {
            return hourlyRate * hoursWorked;
        } else {
            return (hourlyRate * 40) + (hourlyRate * 1.5 * (hoursWorked - 40));
        }
    }
}

class CommissionEmployee extends Employee {
    private double grossSales;

    public CommissionEmployee(int employeeNumber, double grossSales) {
        super(employeeNumber);
        this.grossSales = grossSales;
    }

    @Override
    public double calculatePay() {
        return 0.2 * grossSales; // 20% commission
    }
}

public class PayrollTester {
    public static void main(String[] args) {
        HourlyEmployee hourlyEmployee1 = new HourlyEmployee(1, 16.50, 35);
        HourlyEmployee hourlyEmployee2 = new HourlyEmployee(2, 16.50, 45);
        SalariedEmployee salariedEmployee = new SalariedEmployee(3, 110000);
        CommissionEmployee commissionEmployee = new CommissionEmployee(4, 75000);

        System.out.println("Hourly employee 1 pay: $" + hourlyEmployee1.calculatePay());
        System.out.println("Hourly employee 2 pay: $" + hourlyEmployee2.calculatePay());
        System.out.println("Salaried employee pay: $" + salariedEmployee.calculatePay());
        System.out.println("Commission employee pay: $" + commissionEmployee.calculatePay());
    }
}