multithread

package com.company;
import java.util.List;
import java.util.ArrayList;

public class CarRacing {
    private int numberOfLaps;
    private List<CarRacer> racers;
    private List<CarRacer> rankingList;
    private double fuelQuantity;

    public CarRacing(int numberOfLaps) {
        this.numberOfLaps = numberOfLaps;
        racers = new ArrayList();
        rankingList = new ArrayList();
    }

    public CarRacing(int numberOfLaps, double fuelQuantity) {
        this.numberOfLaps = numberOfLaps;
        this.fuelQuantity = fuelQuantity;
        rankingList = new ArrayList();
        racers = new ArrayList();
    }

    public void addRacer(CarRacer carRacer) {
        racers.add(carRacer);
    }

    public void addRacerToRankingList(CarRacer carRacer) {
        rankingList.add(carRacer);
    }

    public void displayRankList() {
        System.out.println("Rank Linst: ");
        for (CarRacer racer : this.rankingList ) {
            System.out.println(racer);
        }
    }

    public double getFuelQuantity() {
        return  this.fuelQuantity;
    }

    public int getNumberOfLaps() {
        return this.numberOfLaps;
    }

    public void race() {
        for (CarRacer racer : this.racers) {
            Thread thread = new Thread(new RaceThread(this, racer));
            thread.start();
        }
    }

    public boolean fueling(double quantityNeeded) {
        System.out.println(Thread.currentThread().getName() + " " + quantityNeeded +
                this.getFuelQuantity());
        if(this.getFuelQuantity() >= quantityNeeded)
        {
            this.fuelQuantity -= quantityNeeded;
            return true;
        }
        return false;
    }

    public void startFueling(CarRacer carRacer, final double fuelNeeded) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                boolean isFueled = fueling(fuelNeeded);

                if(isFueled)
                {
                    System.out.println("True");
                }
                else {
                    System.out.println("False");
                }
            }
        };
        new Thread(runnable, carRacer.getName()).start();
    }
}

package com.company;

public class CarRacer {
    private String name;

    public CarRacer(String name) {
        this.name = name;
    }

    public String getName() {
        return this.name;
    }

    @Override
    public String toString() {
        return "CarRacer{ name = " + this.name+ "}";
    }
}

package com.company;

public class RaceThread implements Runnable {
    private CarRacer carRacer;
    private CarRacing carRacing;

    public RaceThread(CarRacing carRacing, CarRacer carRacer) {
        this.carRacer = carRacer;
        this.carRacing = carRacing;
    }

    @Override
    public void run() {
        for(int i = 1; i < carRacing.getNumberOfLaps(); i++ )
        {
            System.out.println(this.carRacer.getName() + " tour: " + i);
            if(i == carRacing.getNumberOfLaps()) {
                System.out.println(this.carRacer.getName() + " finished the racing!");
                this.carRacing.addRacerToRankingList(carRacer);
            }
        }
    }
}

package com.company;

public class Refueling implements Runnable {

    private CarRacing racing;
    private double fuelNeeded;

    public Refueling(CarRacing racing, double fuelNeeded)
    {
        this.racing = racing;
        this.fuelNeeded = fuelNeeded;
    }

    public double getFuelNeeded() {
        return this.fuelNeeded;
    }

    @Override
    public void run() {
        boolean isFueled = racing.fueling(fuelNeeded);

        if(isFueled)
        {
            System.out.println("True");
        }
        else {
            System.out.println("False");
        }
    }
}

package com.company;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Main {

    public static void main(String[] args) {
       CarRacer ivan = new CarRacer("Ivan");
       CarRacer angel = new CarRacer("Angel");

       CarRacing carRacing = new CarRacing(20, 100);
        carRacing.addRacer(angel);
        carRacing.addRacer(ivan);
/*
        carRacing.race();

        try
        {
            Thread.sleep(5000);

        } catch ( InterruptedException ex)
        {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }

        carRacing.displayRankList();*/

        carRacing.startFueling(ivan, 80);
        carRacing.startFueling(angel, 40);
    }