import java.lang.*;

class NewThread extends Thread 

{

    NewThread(String threadname, ThreadGroup tgob)

    {

        super(tgob, threadname);

        start();

    }

public void run()

    {

        for (int i = 0; i < 10; i++) 

        {

            try 

            {

                Thread.sleep(10);

            }

            catch (InterruptedException ex) 

            {

              System.out.println("Thread " + Thread.currentThread().getName()

                                   + " interrupted");

            }

        }

        System.out.println(Thread.currentThread().getName() + 

              " finished executing");

    }

} 

public class ThreadGroupDemo 

{

    public static void main(String arg[]) throws InterruptedException,

        SecurityException, Exception

    {

        // creating the thread group

        ThreadGroup gfg = new ThreadGroup("Parent thread");

        ThreadGroup gfg_child = new ThreadGroup(gfg, "child thread");

        // daemon status is set to true

        gfg.setDaemon(true);

        // daemon status is set to true

        gfg_child.setDaemon(true);

        NewThread t1 = new NewThread("one", gfg);

        System.out.println("Starting " + t1.getName());

        NewThread t2 = new NewThread("two", gfg);

        System.out.println("Starting " + t2.getName());

        // string equivalent of the parent group

        System.out.println("String equivalent: " + gfg.toString());

    }

}