ExecutorService vs Casual Thread Spawner

Question

I have a basic question about how ExecutorService works in Java.

It is quite hard to see the difference between simply creating Threads to

Answer 1

ExecutorService provides many advantages compared to plain threads

1. You can create/manage/control life cycle of Threads & optimize thread creation cost overheads
2. You can control processing of tasks ( Work Stealing, ForkJoinPool, invokeAll) etc.
3. You can schedule tasks in Future time
4. You can monitor the progress and health of threads

Even for a single Thread, I prefer to use Executors.newFixedThreadPool(1);

Have a look at related SE questions:

Java's Fork/Join vs ExecutorService - when to use which?

What are the advantages of using an ExecutorService?