Iteration Over Java Collections With High Performance

Introduction

Java developers usually deal with collections such as ArrayList and HashSet. Java 8 came with lambda and the streaming API that helps us to easily work with collections. In most cases, we work with a few thousands of items and performance isn’t a concern. But, in some extreme situations, when we have to travel over a few millions of items several times, performance will become a pain.

I use JMH for checking the running time of each code snippet.

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