Help with java executors: wait for task termination?

The ExecutorService gives you a mechanism to execute multiple tasks simultaneously and get a collection of Future objects back (representing the asynchronous computation of the task).

Rather than submitting Runnables or Callables to an Executor directly and storing the corresponding Future return values I'd recommend using a CompletionService implementation to retrieve each Future when it completes. This approach decouples the production of tasks from the consumption of completed tasks, allowing for example new tasks to originate on a producer thread over a period of time.

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