PayCalculator.java

package payroll;


public class PayCalculator {
  public static double calculate(double hours,
                                 double rate,
                                 boolean isHourlyWorker) {
    if (hours < 0 || hours > 80) {
      throw new RuntimeException("Hours out of range: " + hours);
    }

    if (isHourlyWorker) {
      double overtime = Math.max(0, hours - 40);
      return hours * rate + overtime * rate * 0.5;
    } else {
      return hours * rate;
    }
  }
}