Java ThreadGroup .parentOf (ThreadGroup g)

public final boolean parentOf(ThreadGroup g)

public class Main {
  public static void main(String[] args) {
    ThreadGroupDemo tg = new ThreadGroupDemo();
  }/*from ww w  .ja va 2s . c  o m*/
}

class ThreadGroupDemo implements Runnable {

  public ThreadGroupDemo() {
    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();

    // determine which ThreadGroup is parent
    boolean isParent = pGroup.parentOf(cGroup);
    System.out.println(pGroup.getName() + " is the parent of "
        + cGroup.getName() + "? " + isParent);

    isParent = cGroup.parentOf(pGroup);
    System.out.println(cGroup.getName() + " is the parent of "
        + pGroup.getName() + "? " + isParent);

  }

  public void run() {
    System.out.println(Thread.currentThread().getName()
        + " finished executing.");
  }
}