Counter.java

public class Counter {

	private static int count = 0;

	public static synchronized int getCount() {
		return count;
	}

	public synchronized void setCount(int count) {
		this.count = count;
	}


	public static void main(String[] args) throws InterruptedException {


		ExecutorService threadPool = Executors.newCachedThreadPool();


		for (int i = 0; i < 10; i++) {


			threadPool.submit(() -> {
				Counter counter = new Counter();

				counter.setCount(Counter.getCount() + 1);
			});
		}

		threadPool.shutdown();

		threadPool.awaitTermination(1, TimeUnit.SECONDS);


		System.out.println(Counter.getCount());

	}

}