Suppose I would like to run static method foo
asynchronously
void foo() throws Exception {...}
Since foo
throws an exception I would prefer create a Callable
and invoke ExecutorService.submit
with it to get a Future
.
Now I wonder how to declare those Callable
and Future
properly.
Should I declare them
Callable<Void> and Future<Void>?
Should I declare them
Callable<Void>
andFuture<Void>
?
Yes.
Void
is similar to the wrapper classes Integer
, Long
etc. for the primitive types int
, long
etc. You could say it's a wrapper class for void
, even though void
is not really a type.