Before you can use the java concurrent API, you need to add some dependencies to your "pom.xml" file.

Here's the minimal dependencies needed in order for the following examples to work:

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.17.0</version>
</dependency>

final String namingPattern = "_newFixedThreadPool";

final BasicThreadFactory.Builder builder = new BasicThreadFactory.Builder();

final BasicThreadFactory basicThreadFactory = builder.namingPattern(namingPattern).daemon(true).build();

final ExecutorService executorService = Executors.newFixedThreadPool(2, basicThreadFactory);

IntStream.iterate(0, i -> i + 1).limit(5).forEach(t -> executorService.execute(() -> {
    // simulate a random time-consuming code
    try {
        Thread.sleep(new Random().nextInt(100) + 1);
    } catch (Exception e) {
        e.printStackTrace();
    }

    System.out.println(Thread.currentThread().getName() + ": " + t);
}));

executorService.awaitTermination(200l, TimeUnit.MILLISECONDS);

executorService.shutdown();

Output:

_newFixedThreadPool: 1
_newFixedThreadPool: 0
_newFixedThreadPool: 2
_newFixedThreadPool: 4
_newFixedThreadPool: 3