Understand the difference between the shutdown and shutdownNow methods. Display a list of all the incomplete tasks on the screen.
It should look something like:
pool-1-thread-1, localId=1,
pool-1-thread-2, localId=2,
pool-1-thread-3, localId=3,
pool-1-thread-4, localId=4,
pool-1-thread-5, localId=5.
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