Question

Difference between different type of thread pools

Answer 1

There are various thread pools in java:
Thread Executor : A thread pool with only one thread. So all the submitted tasks will be executed sequentially. Method : Executors.newSingleThreadExecutor()
Cached Thread Pool : A thread pool that creates as many threads it needs to execute the task in parrallel. The old available threads will be reused for the new tasks. If a thread is not used during 60 seconds, it will be terminated and removed from the pool. Method : Executors.newCachedThreadPool()
Fixed Thread Pool : A thread pool with a fixed number of threads. If a thread is not available for the task, the task is put in queue waiting for an other task to ends. Method : Executors.newFixedThreadPool()
Scheduled Thread Pool : A thread pool made to schedule future task. Method : Executors.newScheduledThreadPool()
Single Thread Scheduled Pool : A thread pool with only one thread to schedule future task. Method : Executors.newSingleThreadScheduledExecutor()