Executor.java javadoc ties together
– ExecutorService.java extended-interface
– Executor.java parent-interface
– Executors.java — all-static utility class, similar to Collections and Arrays.
This Javadoc hints that
JDK *implementations* i.e. concrete classes provided in this package implement ExecutorService, which is a more extensive interface than Executor. The Executors class provides convenient factory methods for these Executors.
Remember the Lab49 IV question? There are just 2 executor services (bundled in JDK), so better know them