![]() ![]() But I will counter this attitude in this case, saying that the overhead of Stream.forEach() compared to an ordinary for loop is so significant in general that using it by default will just pile up a lot of useless CPU cycles across all of your application. In many cases, performance is not critical, and you shouldn’t do any premature optimisation – so you may claim that this argument is not really an argument per se. Things may have changed for the better, although there is still a measurable difference. Note: Her benchmarks have been repeated by Nicolai Parlog with JMH, with slightly different results in the extreme cases, but nothing substantially different:īeware, both articles (as well as this one) were written in 2015. Java performance tutorial – How fast are the Java 8 streams? Performance – you will lose on it Angelika Langer has wrapped up this topic well enough in her article and the related talk that she’s giving at conferences: ![]() Here’s a short list of cons of the “modern” approach compared to the classic one:ġ. when chaining a set of operations via Stream’s map(), flatMap() and other operations). only if you truly benefit from the internal, functional iteration (e.g. I claim that the “modern” approach should be used with extreme care, i.e. ![]()
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