How to free up memory of an Executor Service that has been shut down for garbage collecting?

I am working on at the moment on a program that uses a lot of threads.

A- My question is related to freeing up the executors once they have shut down for garbage collecting, what is the best way? I have read somewhere that I have to access the Future (Runnable or Callable) and affect it null for the garbage collector to pick it up.is that true?

B- Same question goes for thre开发者_开发技巧adpools?

Thanks for your help,

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If there is no reference to the Executor Service anymore this should be done automatically.

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Resources of inner Thread CallAble or Runnable are enabled to GC after it compleate, except resource which they return.

If you want force to run GC. You should call:

System.qc();

Then GC will start his work in background.