Cool; next question - you have a library that returns Futures. You have another library that takes CompletableFutures. How do you feed the output of the first i

Cool; next question - you have a library that returns Futures. You have another library that takes CompletableFutures. How do you feed the output of the first into the input of the second? Also, as a note, FutureTask is the only implemented class out of those; the others are all interfaces.