Почему этот вывод не работает здесь System.out.println(Thread.currentThread().getName());?

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/*
Пишем свою ThreadFactory
*/

public class Solution {

    public static void main(String[] args) {
        class EmulatorThreadFactoryTask implements Runnable {
            @Override
            public void run() {
                emulateThreadFactory();
            }
        }

        ThreadGroup group = new ThreadGroup("firstGroup");
        Thread thread = new Thread(group, new EmulatorThreadFactoryTask());

        ThreadGroup group2 = new ThreadGroup("secondGroup");
        Thread thread2 = new Thread(group2, new EmulatorThreadFactoryTask());

        thread.start();
        thread2.start();
    }

    private static void emulateThreadFactory() {
        AmigoThreadFactory factory = new AmigoThreadFactory();
        Runnable r = new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName());
            }
        };
        factory.newThread(r).start();
        factory.newThread(r).start();
        factory.newThread(r).start();
    }

    public static class AmigoThreadFactory implements ThreadFactory {
        private static AtomicInteger groupNumber = new AtomicInteger(1);
        private AtomicInteger threadNumber = new AtomicInteger(1);
        ThreadGroup tg;
        String prefix;

        public AmigoThreadFactory() {
            tg = Thread.currentThread().getThreadGroup();
            prefix = tg.getName() + "-pool-" + groupNumber.getAndIncrement() + "-thread-";
        }

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(tg, r, prefix + threadNumber.getAndIncrement(), 0);
            if (t.isDaemon()) {
                t.setDaemon(false);
            }
            if (t.getPriority() != Thread.NORM_PRIORITY) {
                t.setPriority(Thread.NORM_PRIORITY);
            }
            return t;
        }
    }

}