How can parallel streams improve performance in Java?

How can parallel streams improve performance in Java?

Parallel streams allow you to process collections in parallel, utilizing multiple CPU cores, which can significantly speed up operations.

Can you give me an example of using parallel streams?

Sure! You can use list.parallelStream().map(...) to process elements concurrently. For instance, list.parallelStream().filter(x -> x > 10).collect(Collectors.toList()) filters elements greater than 10 in parallel.

Are there any downsides to using parallel streams?

Yes, parallel streams can introduce overhead for small datasets and may lead to unpredictable performance due to thread management.

When should I avoid using parallel streams?

Avoid using parallel streams for small collections, I/O-bound tasks, or when the order of processing is important.