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11.1. Replace an error code with an exception.
Rewrite the fill(double numberOfGallons) method to throw an Exception if there is an error.
11.2. Decompose a conditional expression.
11.2.1. Add and implement a method in the Car class that determines whether the passed date belongs to summer:
boolean isSummer(Date date , Date summerStart, Date summerEnd).
11.2.2. Add and implement a method that calculates fuel consumption in winter:
double getWinterConsumption(int length).
11.2.3. Add and implement a method that calculates fuel consumption in summer:
double getSummerConsumption(int length).
11.2.4. Rewrite the getTripConsumption() method using the new methods.

Requirements:

You need to change the Car class's fill(double numberOfGallons) method so that it throws an Exception if there is an error.
In the Car class, you need to add and implement a public boolean isSummer(Date date, Date summerStart, Date summerEnd) method.
In the Car class, you need to add and implement a public double getWinterConsumption(int length) method.
In the Car class, you need to add and implement a public double getSummerConsumption(int length) method.
You need to change the getTripConsumption() method using the following methods: isSummer(), getWinterConsumption(), and getSummerConsumption().

package com.codegym.task.task29.task2909.car; import java.util.Date; public class Car { static public final int TRUCK = 0; static public final int SEDAN = 1; static public final int CABRIOLET = 2; double fuel; public double summerFuelConsumption; public double winterFuelConsumption; public double winterWarmingUp; private int type; private boolean driverAvailable; private int numberOfPassengers; protected Car(int type, int numberOfPassengers) { this.type = type; this.numberOfPassengers = numberOfPassengers; } public static Car create(int type, int numberOfPassengers) { Car car = null; if (type == TRUCK) car = new Truck(numberOfPassengers); else if (type == SEDAN) car = new Sedan(numberOfPassengers); else if (type == CABRIOLET) car = new Cabriolet(numberOfPassengers); return car; } public double getTripConsumption(Date date, int length, Date summerStart, Date summerEnd) { double consumption; if (isSummer(date, summerStart, summerEnd)) { consumption = getSummerConsumption(length); } else { consumption = getWinterConsumption(length); } return consumption; } public boolean isSummer(Date date, Date summerStart, Date summerEnd) { return !date.before(summerStart) && !date.after(summerEnd); } public double getWinterConsumption(int length) { return length * winterFuelConsumption * winterWarmingUp; } public double getSummerConsumption(int length) { return length * summerFuelConsumption; } public void fill(double numberOfGallons) throws Exception { if (numberOfGallons < 0) throw new Exception(); fuel += numberOfGallons; } public int getNumberOfPassengersThatCanBeCarried() { if (!isDriverAvailable()) return 0; if (fuel <= 0) return 0; return numberOfPassengers; } public boolean isDriverAvailable() { return driverAvailable; } public void setDriverAvailable(boolean driverAvailable) { this.driverAvailable = driverAvailable; } public void startMoving() { if (numberOfPassengers > 0) { fastenPassengerBelts(); fastenDriverBelt(); } else { fastenDriverBelt(); } } public void fastenPassengerBelts() { } public void fastenDriverBelt() { } public int getMaxSpeed() { if (type == TRUCK) return 80; if (type == SEDAN) return 120; return 90; } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

27 May 2019, 03:17

What is winterWarmingUp? I don't see it initialized anywhere in this code and it definitely is not a part of the equation for winter fuel consumption.

Azja

Level 32 , Krakow, Poland

27 May 2019, 16:41

solution

It is in line 14. And i did it almost according to the method which were before and we have to change that. But one problem was that I was multiplying length,winterFuelConsumption and winterWarmingUp. But it should be

public double getWinterConsumption(int length)
    {
        return length  * winterFuelConsumption + winterWarmingUp;
    }

Thanks for help because I stared at winterWarminUp field more focused