What are the types of Executor Interfaces ?

Posted in: Spring Framework
The java.util.concurrent package defines three Executor Interfaces :

1. Executor : a simple Interface that supports launching new tasks.
2. ExecutorService : A subinterface of Executor, which adds features that help manage the lifecycle, both of the individual tasks and of the Executor itself.
3. ScheduledExecutorService : a subinterface of ExecutorService, supports future and/or periodic execution of tasks.