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HOW WOULD I KNOW HOW MANY THREADS ARE RUNNING CURRENTLY??  RSS feed

 
Greenhorn
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HOW WOULD I KNOW HOW MANY THREADS ARE RUNNING CURRENTLY??
 
Rancher
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Please -PLEASE!-, for all our eyes sake, KeepItDown.
 
(instanceof Sidekick)
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See JConsole which comes with Java5 and later. It can connect to a running program and show you thread information - and a lot more. You can use the same APIs that it uses if you want that info in your own programs.
 
Ranch Hand
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Ideally only one thread should be in running state if its a single processor :-) but if you want to know how many threads (for which start method has been called) are active you can get it by Thread.getActiveCount()
 
Stan James
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I love the ranch because I always see something new. I hadn't read up on activeCount() before. It is for the current thread group only so you may have to walk up the tree of ThreadGroup.getParent to "main" to get all threads.
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