public class TacoPreparation {
    public static void main(String[] args) {
        Thread vegetableThread = new Thread(new ChopVegetablesTask());
        Thread meatThread = new Thread(new CookMeatTask());
        Thread tortillaThread = new Thread(new HeatTortillasTask());
        vegetableThread.start();
        meatThread.start();
        tortillaThread.start();


        try {
            vegetableThread.join();
            meatThread.join();
            tortillaThread.join();
            System.out.println("All tasks are completed! Serve the tacos!");
        } catch (InterruptedException e) {
            System.err.println("Main thread was interrupted. Dinner is cancelled!");
            System.exit(1);
        }
    }
}



class ChopVegetablesTask implements Runnable {
    @Override
    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 vegetables chopped!");
        } catch (InterruptedException e) {
            System.err.println("Vegetable chopping was interrupted. Dinner is cancelled!");
            System.exit(1);
        }
    }
}



class CookMeatTask implements Runnable {
    @Override
    public void run() {
        try {
            System.out.println("Cooking meat");
            Thread.sleep((int)(Math.random() * 5000));
            System.out.println("Meat cooked!");
        } catch (InterruptedException e) {
            System.err.println("Meat cooking was interrupted. Dinner is cancelled!");
            System.exit(1);
        }
    }
}



class HeatTortillasTask implements Runnable {
    @Override
    public void run() {
        try {
            System.out.println("Heating tortillas");
            Thread.sleep((int)(Math.random() * 3000));
            System.out.println("Tortillas heated!");
        } catch (InterruptedException e) {
            System.err.println("Tortilla heating was interrupted. Dinner is cancelled!");
            System.exit(1);
        }
    }
}