Submit, Wait, Shut Down

Five things this topic established, and where each one was.

What the topic established, and which card it was on
The thing	Where
A pool separates what work there is from which thread runs it	Handing Work to a Pool
`Callable` returns a value and may throw; `Runnable` does neither	Runnable Against Callable
`get()` blocks, so submit everything before collecting anything	What Future.get() Does
`shutdown` asks, `awaitTermination` waits, `shutdownNow` insists	Shutting a Pool Down
A pool nobody shuts down keeps the process alive with nothing to do	Why Your Program Hung After main Returned

The one worth carrying: submitting is not running and getting is waiting. Almost every disappointing result from a thread pool is one of those two sentences being forgotten at a call site.

Java
Concurrency