class IncrementCounterTask implements Runnable {
    final SharedCounter sharedCounter;

    IncrementCounterTask(SharedCounter sharedCounter) {
        this.sharedCounter = sharedCounter;
    }

    @Override
    public void run() {
        for (int i = 0; i < 5; i++) {
            sharedCounter.incrementCounter();
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                System.out.println("The counting thread was interrupted. Exits.");
                System.exit(1);
            }
        }
    }
}