Cars.java

package Cars;

public class Car {

    static public int count = 0;
    
    protected String name;
    protected Engine engine; 
    protected double fuel, usedFuel;

    
    public Car(String name, double volumeEngine, double fuel) {
        this.name = name;
        this.fuel = fuel;
        engine = new Engine(0, volumeEngine);
        count++;
    }
    
    public Car(String name, double volumeEngine, double mileage, double fuel) {
        this.name = name;
        this.fuel = fuel;
        engine = new Engine(mileage, volumeEngine);
        count++;
    }
    
    public String getName() {
        return name;
    }

    public double getVolumeEngine() {
        return engine.getVolumeEngine();
    }
    
    public double getMileage() {
        return engine.getMileage();
    }


    public double getFuel() {
        return fuel;
    }

    public double getUsingFuel() {
        return engine.getUsingFuel();
    }

    public double getUsedFuel() {
        return usedFuel;
    }

    public double leftFuel() {
        return (fuel - usedFuel);
    }

    public void turnOn() {
        engine.turnOn();
    }
    
    public void turnOff() {
        engine.turnOff();
    }
    
    public void start(int speed, double hours) {
        if ( ! engine.isStarted() || fuel == 0)
            return;
    
        double distance = hours * speed;
        engine.addMileage(distance);
        usedFuel += distance / 100 * engine.getUsingFuel();
    }
}

Engine.java

package Cars;

public class Engine {
    
    protected double mileage = 0;
    protected boolean started;
    protected double volumeEngine;
    protected double usingFuel;

    
    public Engine(double mileage, double volumeEngine) {
        this.mileage = mileage;
        this.volumeEngine = volumeEngine;
        usingFuel = volumeEngine * 4;
    }

    public double getVolumeEngine() {
        return volumeEngine;
    }

    public double getUsingFuel() {
        return usingFuel;
    }

    public double getMileage() {
        return mileage;
    }
    
    public void addMileage(double mileage) {
        if (started)
            this.mileage += mileage;
    }
    
    public boolean isStarted() {
        return started;
    }
    
    public void turnOn() {
        started = true;
    }
    
    public void turnOff() {
        started = false;
    }
}

MyClass.java

package Cars;

public class MyClass {
    public static void main(String[] args) {
        Car bmw = new Car("BMW", 1.6, 20.0);
        Car ferrari = new Car("Ferrari",2.0, 20000, 15.0);
            
        bmw.turnOn();
        ferrari.turnOn();
            
        int[] speeds = new int[] {20, 60, 100};
            
        for (int s : speeds)
            bmw.start(s, 0.5);
        for (int s : speeds)
            ferrari.start(s, 1);
            
        bmw.turnOff();
        ferrari.turnOff();
            
        System.out.println("Cars count: " + Car.count);
        System.out.println("Автомобиль " + bmw.getName());
        System.out.println("Объем двигателя " + bmw.getVolumeEngine());
        System.out.println("Пробег " + bmw.getMileage() + " км");
        System.out.println("Заправлен перед заездом на " + bmw.getFuel() + " л");
        System.out.println("Расход топлива " + bmw.getUsingFuel() + " л на 100 км");
        System.out.println("Потрачено топлива за последний заезд " + bmw.getUsedFuel() + " л");
        System.out.println("Осталось топлива в баке " + bmw.leftFuel() + " л");
        System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~");

        System.out.println("Автомобиль " + ferrari.getName());
        System.out.println("Объем двигателя " + ferrari.getVolumeEngine());
        System.out.println("Пробег " + ferrari.getMileage() + " км");
        System.out.println("Заправлен перед заездом на " + ferrari.getFuel() + " л");
        System.out.println("Расход топлива " + ferrari.getUsingFuel() + " л на 100 км");
        System.out.println("Потрачено топлива за последний заезд " + ferrari.getUsedFuel() + " л");
        System.out.println("Осталось топлива в баке " + ferrari.leftFuel() + " л");
    }
}