Java Parallel Streams Internals: Order of Results for Collections

This video shows how the choice of collection type in Java affects the order of results when using ParallelStreams. When an ordered collection like a List is used, encounter order is maintained due to the ordered nature of Spliterators. The example in this video demonstrates that after filtering and transforming elements, the final result is also ordered when converted back to an array using the toArray terminal operation. Conversely, unordered collections like HashSets don't guarantee order in the results, potentially offering speed advantages. The importance of considering order is emphasized, especially when dealing with large datasets where unordered collections may offer performance gains.