CarRental.java

package lesson3;
public final class CarRental {
    private final String carModel;
    private final double days;
    private final double ratePerDay;
    private final double milesPerday;

    public CarRental(String carModel, double days, double ratePerDay, double milesPerday){
        this.carModel=carModel;
        this.days=days;
        this.ratePerDay=ratePerDay;
        this.milesPerday=milesPerday;
        if(days<=0){
            throw new IllegalArgumentException("Days Must be Positive");
        }
        if(ratePerDay<=0){
            throw new IllegalArgumentException("ratePerDay Must be Positive");
        }
        if(milesPerday<=0){
            throw new IllegalArgumentException("milePerDay Must be Positive");
        }

    }
    public String getCarModel() {
        return carModel;
    }

    public double getDays() {
        return days;
    }

    public double getRatePerDays() {
        return ratePerDay;
    }

    public double getMilesPerday() {
        return milesPerday;
    }
    public double totalRentalCost(){
        return days*ratePerDay;
    }
    public double totalMilesAllowed(){
        return days*milesPerday;
    }
}