Future.java

ExecutorService executorService = Executors.newSingleThreadExecutor();

Callable<String> hello = () -> {
            Thread.sleep(2000L);
            return "Hello";
        };

Callable<String> java = () -> {
            Thread.sleep(3000L);
            return "Java";
        };

Callable<String> minho = () -> {
    Thread.sleep(1000L);
    return "Minho";
};

List<Future<String>> futureList = executorService.invokeAll(Arrays.asList(hello,java,minho));

futureList.stream().forEach((i) -> {
    try {
        System.out.println(i.get());
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }
});