Java 17: Inefficient performance when using Streams with large Collections and Optional
I'm following best practices but I've spent hours debugging this and I'm learning this framework and I just started working with I've tried everything I can think of but I'm working with important performance optimization when processing large Collections using `Stream` in Java 17, particularly when dealing with `Optional`..... My goal is to filter a large List and retrieve the first matching element efficiently. However, using `Optional` seems to introduce latency. Here’s a simplified version of my code: ```java import java.util.*; import java.util.stream.*; public class StreamPerformanceDemo { public static void main(String[] args) { List<Integer> numbers = new ArrayList<>(); for (int i = 0; i < 1_000_000; i++) { numbers.add(i); } // Attempting to find the first even number greater than 500,000 Optional<Integer> firstEven = numbers.stream() .filter(n -> n > 500_000) .filter(n -> n % 2 == 0) .findFirst(); firstEven.ifPresent(System.out::println); } } ``` When I run this code, it takes noticeably longer than expected to execute, especially with larger datasets. I've tried switching to a parallel stream to enhance performance: ```java Optional<Integer> firstEven = numbers.parallelStream() .filter(n -> n > 500_000) .filter(n -> n % 2 == 0) .findFirst(); ``` However, the performance improvement is minimal, and sometimes the execution time worsens. I also considered that the use of `Optional` might be adding overhead, but I’m unsure how to optimize this further without losing clarity in my code. Is there a more efficient way to perform this operation with large Collections, or should I approach this question differently? Any insights into best practices when using Streams and Optional together would be greatly appreciated! For context: I'm using Java on Debian. What's the best practice here? The project is a application built with Java. Any help would be greatly appreciated! What's the correct way to implement this? Hoping someone can shed some light on this. I'd be grateful for any help. My development environment is macOS. What's the correct way to implement this?