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Concurrency
Executors
In all of the previous examples, there's a close connection between the
task being done by a new thread, as defined by its
Runnable
object, and the thread itself, as
defined by a Thread
object. This works well for small
applications, but in large-scale applications, it makes sense to
separate thread management and creation from the rest of the
application. Objects that encapsulate these functions are known as
executors. The following subsections describe executors in
detail.