TaskScheduleExecute
	|_ ScheduledThreadPoolExecutor
			|_ ThreadPoolExecutor
						|_ AbstractExecutorService
									|_ ExecutorService
												|_ Executor
			|_ ScheduledExecutorService
						|_ ExecutorService
									|_ Executor

Java Concurrency API -> Thread Pool
1. Cached thread pool
2. Fixed thread pool (**)
3. Single-threaded pool
4. Fork/Join pool

1. newSingleThreadExecutor()
2. newCachedThreadPool()
3. newFixedThreadPool(int n) (**)
4. newScheduledThreadPool(int corePoolSize)
5. newSingleThreadScheduledExecutor()

ThreadPoolExecutor

corePoolSize    : Số lương Thread mặc định trong Pool
maxPoolSize     : Số lượng tối đa Thread trong Pool
queueCapacity   : Số lượng tối đa của BlockingQueu

Ví dụ:
corePoolSize: 5
maxPoolSize: 15
queueCapacity: 100
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