executorService = Executors.newScheduledThreadPool (1) on a thread of it this way makes sense it?

  thread   thread pool

executorService = Executors.newScheduledThreadPool (1);

above , on one thread only, it is also necessary to use the thread pool , direct new thread and then start not enough , there is the difference? Seeking advice.
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Note that threads in the pool can be reused , and what new Thread , exhausted gone.

1 ex useful , only one thread can be restricted to work .
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create threads and destroying threads are the need of time. Performance is not high , read this article
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run in the thread pool it may still be safe , and if on a thread, then why open the thread it? In the main thread ran not?