Have you worked with ParallelStream?

Yes, I have worked with ParallelStream in Java. It is a convenient tool for parallel processing of collections using streams.

ParallelStream allows automatic parallelization of operations on collection elements, which can significantly speed up processing on multi-core processors.

Example of usage:

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
int sum = numbers.parallelStream()
                 .filter(n -> n % 2 == 0)
                 .mapToInt(Integer::intValue)
                 .sum();
System.out.println("Sum of even numbers: " + sum);

It is important to remember that not all operations are suitable for parallel execution — for example, operations with side effects or non-thread-safe data structures can lead to errors.

Also, consider the overhead of creating and managing threads, so for small collections, ParallelStream may be less efficient than a sequential Stream.