Learn how to fine-tune and parallelize the behavior of Java iterators, using Java 8's forEach() method and Streams API. Then see some performance benchmarks that might surprise you ...

An extensible terminal operation, Stream::collect, also is featured, enabling the output of a pipeline to be summarized in multiple ways. Use of streams in the Java ecosystem now is pervasive.

Parallel streams utilize the fork/join pool which defaults to the number of available cores. This can help improve performance, but it's limited by the pool size and the fact that this is I/O-bound ...