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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.
 
It is sorta covered in the JavaRanch Style Guide.
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