public class CompletableFutureBuildDemo {
    public static void main(String[] args)throws ExecutionException,InterruptedException {
        ExecutorService executorService = Executors.newFixedThreadPool(3);
        CompletableFuture<Void> completableFuture =CompletableFuture.runAsync(()->{
            System.out.println(Thread.currentThread().getName());
            try {
                TimeUnit.SECONDS.sleep(1);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
        });
        System.out.println(completableFuture.get());
        executorService.shutdown();
    }
}