Show all running thread(s)

I know this is an easy question for all of you thread experts.
I am currently working with swing applications and still learning more about threads.
now my problem:
I just want to display all threads that are running when I execute my application.
I search and found this link:
http://jug.org.ua/wiki/display/JavaAlmanac/Listing+All+Running+Threads
does all threads found in a thread group?
Is this a good example to show all running threads?
If you have a good solution or link please let me know.
Thanks in advance. :)

ThreadGroup itself is just a container for a number of threads. There's a root ThreadGroup which includes every thread running by the JVM.
As you want to just list all running threads, it's a good solution until you see that it omits a thread. You can try this in several cases to ensure no running thread is ignored.

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