IntStream tstream = IntStream.rangeClosed(1, 100000000);
		Collector<Object, ?, Map<Object, List<Object>>> collector = Collectors.groupingBy(i -> Thread.currentThread());
		Map<Object, List<Object>> coll = tstream.boxed().parallel().collect(collector);
		coll.replaceAll((thread, list) -> Arrays.asList(list.size()));
		System.out.println(coll.size() + " threads was used: " + coll);

    public Duration(final int period, final TimeUnit unit) {
        Objects.requireNonNull(unit);
        this.period = period;
        this.unit = Objects.requireNonNull(unit);
    }

        Files.list(directory)
                .map(UniqueTimePath::new)
                .filter(pathsSubmitted::add)
                .forEach(path -> executor.execute(() -> fileConsumer.accept(path.getPath())));

Consumer<UniqueTimePath> consumer = path -> fileConsumer.accept(path.getPath());
Function<UniqueTimePath, Runnable> function = path -> (() -> consumer.accept(path));
Consumer<UniqueTimePath> outerConsumer = path -> executor.execute(function.apply(path));
Files.list(directory)
        .map(UniqueTimePath::new)
        .filter(pathsSubmitted::add)
        .forEach(outerConsumer);

  path -> executor.execute(new ProcessThings(path));

		Scanner sc = new Scanner(System.in);
		sc.nextLine();
		sc.close();
		sc = new Scanner(System.in);
		sc.nextLine(); // Throws 'java.util.NoSuchElementException: No line found'
		sc.close();

for (int i = 0; i < 2; i++) {
    try (Scanner scanner = new Scanner(System.in)) {
        while (scanner.hasNextInt()) {
            int next = scanner.nextInt();
            if (next == 0) {
                break;
            }
            System.out.println("Input was: " + next);
        }
    }
}

here is some psudo C# code

Main
{
    Spawn PhysicsThread(DateTime.Now);
    Spawn GUI Thread
}

PhysicsThread(initialTime)
{
	DateTime lastRan = initialTime;
	while(True)
	{
		DateTime now = DateTime.Now;
		TimeSpan delta = now - lastRan;
		lastRan = now;
		foreach(PhysicsObject po in AllPhysicsObjects)
		{
			po.DoPhysics(delta);
		}
	}
}