What is the difference between submit and execute method with ThreadPoolExecutor [duplicate]

Answer 1

The difference is that execute doesn't return a Future, so you can't wait for the completion of the Runnable and get any exception it throws using that.

Answer 2

Submit appears to be a more generic form of execute. In particular, submit returns a Future object that represents the result of the computation.

ThreadPoolExecutor-1

ThreadPoolExecutor -2

Answer 3

The submit(...) method is an executor framework extension introduced in ExecutorService interface.

Its main difference from execute(Runnable) is that submit(...) can accept a Callable<V> (whereas execute() accepts only Runnable) and returns an instance of Future<V>, which you can use later in the caller to retrieve the result asynchronously (potentially blocking until the computation performed by the Callable is completed).