I noticed that there are submit methods for both Runnable task and Callable task. Why is there only invokeAll for Callable tasks, but no invokeAll for Runnable tasks. Thanks
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1possible duplicate of [ExecutorService.invokeAll does NOT support collection of runnable task](http://stackoverflow.com/questions/24081417/executorservice-invokeall-does-not-support-collection-of-runnable-task) – skaffman Jul 17 '14 at 11:52