How to collect the elements of a Stream into a Queue? [duplicate]

Question

I have the following code:

Queue<Reward> possibleRewards = 
    Stream.of(Reward.values())
          .flatMap(reward -> IntStream.range(0, reward.getOccurencies()).mapToObj(i -> reward))
          .collect(Collectors.toList());

As you can see, I need to collect the elements of the Stream into a Queue, not a List. However, there's no Collectors.toQueue() method. How can I collect the elements into a Queue?

Answer 1

You can use Collectors.toCollection(), which lets you choose whatever Collection implementation you wish to produce:

Queue<Reward> possibleRewards = 
    Stream.of(Reward.values())
          .flatMap(reward -> IntStream.range(0, reward.getOccurencies()).mapToObj(i -> reward))
          .collect(Collectors.toCollection(PriorityQueue::new)); // use whatever Queue 
                                                                 // implementation you want