Example of a cached-thread-pool where all threads are daemon-threads

cached_threads2.java

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

public class ImprovedCachedThreads {

    public static void main(String[] args) {
        final ThreadFactory threadFactory = runnable -> {
            final Thread thread = new Thread(runnable, "HelloWorldThread");
            thread.setDaemon(true);
            return thread;
        };
        final ExecutorService executor = Executors.newCachedThreadPool(threadFactory);
        executor.submit(() -> System.out.println("Hello World"));
    }

}