Java 8 CompletableFuture.allOf(…) with Collection or List [duplicate]

Unfortunately, to my knowledge CompletableFuture does not support collections.

You could do something like this to make the code a bit cleaner, but it essentially does the same thing

public <T> CompletableFuture<List<T>> allOf(List<CompletableFuture<T>> futuresList) {
    CompletableFuture<Void> allFuturesResult =
    CompletableFuture.allOf(futuresList.toArray(new CompletableFuture[futuresList.size()]));
    return allFuturesResult.thenApply(v ->
            futuresList.stream().
                    map(future -> future.join()).
                    collect(Collectors.<T>toList())
    );
}

Found this very informative : http://www.nurkiewicz.com/2013/05/java-8-completablefuture-in-action.html