About Question enthuware.ocpjp.v8.-2-.1124 :

[__JJ__]

ExecutorService allows you to execute a Callable.

Hi admin,
Sorry, ExecutorService allows you to submit a Callable. Of course, execute in common language means the same thing, but the method in Executor is execute, whereas the method in ExecutorService is submit, and the method in SES is schedule.

[admin]

I think it is clear from the context that the explanation is talking their difference wrt Runnable and Callable. For example, when we say "run a class", it doesn't mean the class has a method named run.