The difference between the Runnable and Callable interfaces in Java

Question

what is the difference between using the Runnable and Callable interfaces when designing a concurrent thread in Java, why would you choose one over the other?

Answer 1

you should note that the Callable interface is similar to Runnable, in that both are designed for classes whose instances are potentially executed by another thread

but a Runnable, however, does not return a result and cannot throw a checked exception.