.get() vs .join()

[Mildred-ui]

Hi all!

I was looking at API for CompletableFuture, then I realized the .get() and .join() method are pretty similar.

.get() : Waits if necessary for this future to complete, and then returns its result.
.join(): Returns the result value when complete, or throws an (unchecked) exception if completed exceptionally.

I just wonder if there's any rules for using these two methods in different situation. Like is get() better than join() in some cases?

Thanks!

[naranghardik16]

the only difference is how methods throw exceptions. get() is declared in Future interface as

V get() throws InterruptedException, ExecutionException;

The exceptions are both checked exceptions which means they need to be handled in the code itself.

The join() method doesn't throw checked exceptions.

public T join()

Instead it throws unchecked CompletionException.

[sharleneq]

To add on, perhaps you can read up on this which provides an example of handling of the exceptions for get() and join() respectively.

https://stackoverflow.com/questions/45490316/completablefuture-join-vs-get