Display all running Thread in java pgm

Display all running Thread

public class Main extends Thread

{

 public static void main(String[] args)

   {

      Main t1 = new Main();

      t1.setName("thread1");

      t1.start();

      ThreadGroup currentGroup =

      Thread.currentThread().getThreadGroup();

      int noThreads = currentGroup.activeCount();

      Thread[] lstThreads = new Thread[noThreads];

      currentGroup.enumerate(lstThreads);

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

      System.out.println("Thread No:" + i + " = "+ lstThreads[i].getName());

   }

}