private static boolean groupStopped = false ;

    private static final Object lock = new Object();

    private static final ThreadGroup group = new ThreadGroup("");

    private static final Thread first = new Thread(group, new Stop());

    private static final Thread second = new Thread(group, new Stop());

            // Give the other thread a chance to start

                Thread.sleep(1000);

            } catch (InterruptedException e) {

            }

            // When the first thread runs, it will stop the group.

            if (Thread.currentThread() == first) {

                synchronized (lock) {

                    try {

                        group.stop();

                    } finally {

                        // Signal the main thread it is time to check

                        // that the stopped thread group was successful

                        groupStopped = true;

                        lock.notifyAll();

                    }

                }

        // Launch two threads as part of the same thread group

        first.start();

        second.start();

        // Wait for the thread group stop to be issued

        synchronized(lock){

            while (!groupStopped) {

                lock.wait();

                // Give the other thread a chance to stop

                Thread.sleep(1000);

            }

        }

        // Check that the second thread is terminated when the

        // first thread terminates the thread group.

        // Clean up any threads that may have not been terminated

        first.stop();

        second.stop();