Shuffle a list of integers with Java 8 Streams API

Question

I tried to translate the following line of Scala to Java 8 using the Streams API:

// Scala
util.Random.shuffle((1 to 24).toList)

To write t

Answer 1

You may find the following toShuffledList() method useful.

private static final Collector SHUFFLER = Collectors.collectingAndThen(
        Collectors.toCollection(ArrayList::new),
        list -> {
            Collections.shuffle(list);
            return list;
        }
);

@SuppressWarnings("unchecked")
public static  Collector> toShuffledList() {
    return (Collector>) SHUFFLER;
}

This enables the following kind of one-liner:

IntStream.rangeClosed('A', 'Z')
         .mapToObj(a -> (char) a)
         .collect(toShuffledList())
         .forEach(System.out::print);

Example output:

AVBFYXIMUDENOTHCRJKWGQZSPL