import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class ProducerConsumer {
    private static final int END = -1;

    public static void main(String[] args) throws InterruptedException {
        BlockingQueue<Integer> queue = new ArrayBlockingQueue<>(2);
        Thread producer = Thread.ofVirtual().name("producer").start(() -> {
            try {
                for (int number = 0; number < 5; number++) {
                    queue.put(number);
                }
                queue.put(END);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        });
        Thread consumer = Thread.ofVirtual().name("consumer").start(() -> {
            try {
                while (true) {
                    int number = queue.take();
                    if (number == END) {
                        break;
                    }
                    System.out.println("consumed: " + number);
                }
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        });
        producer.join();
        consumer.join();
    }
}