Shall Callable be preferred over Runnable?

Question

I have understood the difference between Runnable and Callable interface in Java. From Java 1.5 additional features has been added to Runnable

Answer 1

IMHO, Runnable is a better type to use when taking as argument a function which

• doesn't have a returned value, but only side effects
• must handle exceptions, and not propagate them

Don't forget that Callable.call() throws Exception. That means that if you take a Callable as argument, this Callable can throw any kind of exception, and you must have a way to handle them all in a correct way. If you can't do that, it's better to let the implementor of the Callable handle the exception as he wants to, and make the argument a Runnable to make that clear.