Executors

The Java Concurrency API defines the following 3 base interfaces for executors:

• Executor : is the super type of all executors. It defines only one method execute(Runnable)

• ExecutorService: is an Executor that allows tracking progress of value-returning tasks (Callable) via Future object, and manages the termination of threads. Its key methods include submit() and shutdown().

• ScheduledExecutorService: is an ExecutorService that can schedule tasks to execute after a given delay, or to execute periodically. Its key methods are schedule(), scheduleAtFixedRate() and scheduleWithFixedDelay().