Executors and Futures

Thread pools: a fixed set of threads that run tasks from a queue, so the number of threads no longer grows with the amount of work. Creating a thread per task stops working somewhere between a hundred tasks and a hundred thousand, and shutting a pool down is the step that gets skipped and leaves a process nothing can stop. It covers ExecutorService, Runnable and Callable, Future.get(), shutdown, CompletableFuture, and choosing a pool for a workload. It leaves out the fork/join framework's internals.