The difference between Executors.newSingleThreadExecutor().execute(command) and new Thread(command).start();

Question

Well title says it, what is the difference between Executors.newSingleThreadExecutor().execute(command) and new Thread(command).start();

Answer 1

Executors.newSingleThreadExecutor().execute(command) will reuse previously constructed thread, it will not created new thread as in case of new Thread(). If the thread that have not been used for sixty seconds are terminated, It's a kind of pool which contains a single thread which make its equivalent newFixedThreadPool(1).