JAVA Briefly explain the code in area with a /*comment*/ above it

/** * A program that tests your implementation that

* lists all thread groups

* - and threads within each group -

* in the JVM. */

public class CreateThreadGroups

{

public CreateThreadGroups() {

/* Comment Here */

ThreadGroup alpha = new ThreadGroup("alpha");

ThreadGroup beta = new ThreadGroup("beta");

ThreadGroup theta = new ThreadGroup(alpha, "theta");

/* Comment Here */

(new Thread(alpha, new GroupWorker())).start();

(new Thread(alpha, new GroupWorker())).start();

(new Thread(alpha, new GroupWorker())).start();

(new Thread(beta, new GroupWorker())).start();

(new Thread(theta, new GroupWorker())).start();

(new Thread(theta, new GroupWorker())).start();

}

class GroupWorker implements Runnable

{

public void run() {

while (true) {

try {

Thread.sleep(1000);

for (int i = 0; i < 1000000; i++)

;

}

catch (InterruptedException ie) {

}

}

}

}

}