Easy way to convert Iterable to Collection

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In my application I use 3rd party library (Spring Data for MongoDB to be exact).

Methods of this library return Iterable<T>, while the rest of my code expects Collection<T>.

Is there any utility method somewhere that will let me quickly convert one to the other? I would like to avoid creating a bunch of foreach loops in my code for such a simple thing.

22 Answers
22

In JDK 8+, without using any additional libs:

Iterator<T> source = ...;
List<T> target = new ArrayList<>();
source.forEachRemaining(target::add);

Edit: The above one is for Iterator. If you are dealing with Iterable, 

iterable.forEach(target::add);

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