public static void dumptg (ThreadGroup tg){
        // First, get our thread group
        if (tg == null){
            // none specified, assume current thread group
            tg = Thread.currentThread().getThreadGroup();    
        }
        
        // display the threadgroup name and object id
        System.out.println("ThreadGroup "+tg.getName()+ ", objid = "+tg.hashCode());
        
        // display the threadgroup's number of active subgroups
        System.out.println("  subgroups  = "+tg.activeGroupCount());
        
        // get and display the number of active threads in this threadgroup and all subgroups
        int tcount = tg.activeCount();
        System.out.println("  total threads = "+tcount);
        
        // allocate an array big enough to hold the number of threads
        Thread[] arr = new Thread[tcount];
        
        // fill in the array with the active threads (include subgroups)
        int num = tg.enumerate(arr,true);
        
        // display how many were stored.
        System.out.println("\nTHREADNAME, THREADID, THREADGROUP");
        
        // display the name, id and owning threadgroup of each thread
        for (int i = 0; i<num; i++){
            System.out.println(arr[i].getName()+", "+
                               arr[i].hashCode()+", "+
                               arr[i].getThreadGroup().getName());
        }
        
    }

public void NotesMain ()  {

        //other code here

        System.out.println("Dump the current threadgroup:\n");
        dumptg(null);
    }