Please see
- https://nzhong.github.io/blog/2016/07/java-concurrency-future-vs-promise-1.html
- https://nzhong.github.io/blog/2016/08/java-concurrency-future-vs-promise-2.html
- https://nzhong.github.io/blog/2016/08/java-concurrency-future-vs-promise-3.html
this repo contains various java code that make use of Future & CompletableFuture.