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public class NoSyncAppWithDaniel {

    private static int counter;

    public static void main(String[] args) {
        long startTime = System.currentTimeMillis();
        // Tworzenie dwóch wątków
        Thread thread1 = new Thread(new IncrementTask());
        Thread thread2 = new Thread(new IncrementTask());
        Thread thread3 = new Thread(new IncrementTask());
        Thread thread4 = new Thread(new IncrementTask());

        // Uruchamianie wątków
        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();

        try {
            // Czekanie na zakończenie obu wątków
            thread1.join();
            thread2.join();
            thread3.join();
            thread4.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("Wartość zmiennej counter: " + counter);
        long endTime = System.currentTimeMillis();
        long elapsedTime = endTime - startTime;
        System.out.println("Czas trwania: " + elapsedTime + " ms");
    }

    // Zadanie inkrementacji zmiennej counter
    private static class IncrementTask implements Runnable {

        @Override
        public void run() {
            for (; counter < 1000; counter++) {
                try {
                    Thread.sleep(50);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                System.out.println(counter);
            }
        }
    }
}