ride_fare_cal

RideFareCalculator.java

public class RideFareCalculator {

//   in real system, these values must be configurable outside of code
  private static final double BASE_FARE = 3.0;
  private static final double RATE_PER_KM = 2.50;
  private static final double RATE_PER_MINUTE = 0.50;
  private static final double MINIMUM_FARE = 5.0;

  public static double calculateFare(double distanceKm, double timeMinutes, double surgeMultiplier) {
    if (distanceKm < 0 || timeMinutes < 0 || surgeMultiplier < 0) {
      throw new IllegalArgumentException("Distance, time, and surge multiplier must be non-negative values.");
    }

    double distanceFare = distanceKm * RATE_PER_KM;
    double timeFare = timeMinutes * RATE_PER_MINUTE;
    double totalFare = BASE_FARE + distanceFare + timeFare;

    double fare = totalFare * surgeMultiplier;
    return Math.max(fare, MINIMUM_FARE);
  }

  public static void main(String[] args) {
    double distanceKm = 10.0;
    double timeMinutes = 20.0;
    double surgeMultiplier = 1.0;

    double fare = calculateFare(distanceKm, timeMinutes, surgeMultiplier);

    System.out.printf("The fare for your trip is: $%.2f\n", fare);
  }
}