import java.util.concurrent.CountDownLatch;

public class CountDown {
    public static void main(String[] args) {
        CountDownLatch cd = new CountDownLatch(2);
        Thread veggie = new Thread(new ChopVegetables(cd));
        Thread meat = new Thread(new CookMeat(cd));
        Thread tortilla = new Thread(new HeatTortillas(cd));

        veggie.start();
        meat.start();
        tortilla.start();
    }
}

class ChopVegetables implements Runnable {
    private final CountDownLatch cd;

    ChopVegetables(CountDownLatch cd) {
        this.cd = cd; 
    }

    public void run() {
        try {
            String[] vegetables = {"Tomato", "Lettuce", "Onion"};
            for(String veggie : vegetables) {
                System.out.println("Chopping " + veggie);
                Thread.sleep((int) (Math.random() * 2500));
            }
            System.out.println("All veggies chopped!");
            cd.countDown();
        } catch(InterruptedException e) {
            System.exit(1);
        }
    }
}

class CookMeat implements Runnable {
    private final CountDownLatch cd;

    CookMeat(CountDownLatch cd) {
        this.cd = cd; 
    }

    public void run() {
        try {
            System.out.println("Cooking meat");
            Thread.sleep((int) Math.random() * 5000);
            System.out.println("Meat cooked!");
            cd.countDown();
        } catch(InterruptedException e) {
            System.exit(1);
        }
    }
}

class HeatTortillas implements Runnable {
    private final CountDownLatch cd;

    HeatTortillas(CountDownLatch cd) {
        this.cd = cd; 
    }

    public void run() {
        try {
            cd.await();
            System.out.println("Heating tortillas");
            Thread.sleep((int) Math.random() * 3000);
            System.out.println("Tortillas heated!");
        } catch(InterruptedException e) {
            System.exit(1);
        }
    }
}