Convert a List of CompletableFutures to a CompletableFuture of a List

listOfFuturesToFutureList.java

public static <T> CompletableFuture<List<T>> listOfFuturesToFutureList(final List<CompletableFuture<T>> listOfFutures) {
    final Function<List<CompletableFuture<T>>, List<T>> transformFunction = futures -> futures.stream()
        .map(CompletableFuture::join)
        .collect(Collectors.toList());
    return CompletableFuture.allOf(listOfFutures.toArray(new CompletableFuture[0]))
        .thenApply(v -> transformFunction.apply(listOfFutures));
}