Java ThreadGroup.isDestroyed()

public boolean isDestroyed()

public class Main {
  public static void main(String[] args) {
    ThreadGroupDemo tg = new ThreadGroupDemo();
  }/*  w  w  w  .j av  a  2 s  . co m*/
}

class ThreadGroupDemo implements Runnable {
  public ThreadGroupDemo() {
    try {
      ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");

      ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");

      Thread t1 = new Thread(pGroup, this);
      System.out.println("Starting " + t1.getName());
      t1.start();

      Thread t2 = new Thread(cGroup, this);
      System.out.println("Starting " + t2.getName());
      t2.start();

      t1.join();
      t2.join();

      if (!cGroup.isDestroyed()) {
        cGroup.destroy();
      } else {
        System.out.println(cGroup.getName() + " destroyed");
      }

      // parent group destroyed
      if (!pGroup.isDestroyed()) {
        pGroup.destroy();
      } else {
        System.out.println(pGroup.getName() + " destroyed");
      }

    } catch (Exception ex) {
      System.out.println(ex.toString());
    }
  }

  public void run() {

    System.out.println(Thread.currentThread().getName()
        + " finished executing.");
  }
}