Checking whether all tasks in ThreadPoolExecutor are completed

Question

How can I check whether all tasks submitted to ThreadPoolExecutor are completed?

New tasks can be added from previously submitted tasks, so I can't call shutdown followed by awaitTermination nor invokeAll, as it will ignore these new tasks.

Answer 1

yourThreadPoolExecutor.getActiveCount(); will return 0 when all tasks have completed.

Answer 2

You can use ThreadPoolExecutor.getCompletedTaskCount()