CODEWITHSUNDEEP
javasetshuffle
quento
quento

Reputation: 1114

get ALL elements from set in random order

I need to get all elements from set in random order. I found some solutions, however i would like to find the best and the fastest. Is there any analogue for Collections.shuffle?

Upvotes: 1

Views: 1336

Answers (1)

Burleigh Bear
Burleigh Bear

Reputation: 3314

There's not a direct analogue, because there's no order on sets, so shuffling has no semantics for the set. If you want to get the elements in different orders a number of times, you need to convert the Set to a list (which you know has no duplicates because it just came from a Set) and shuffle it.

List<Elem> withAnOrdering = new ArrayList<>(fromMySetOfElem);
for (int i = 0; i < numTimes; i++)
{
     Collections.shuffle(withAnOrdering);
     //Do something with the ordering

}

Upvotes: 4

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