gistfile1.txt

combinedFuture.thenApply(v ->
       Stream.of(completableFuture1, completableFuture2, completableFuture3).
               map(CompletableFuture::join).
               collect(Collectors.toList()));
String combined = Stream.of(completableFuture1, completableFuture2, completableFuture3)
       .map(CompletableFuture::join)
       .collect(Collectors.joining(" "));
System.out.println(combined); // Hello Knolders! Its allOf