Java Lambdas and (parallel) Streams


This book is no longer available for sale.

Java Lambdas and (parallel) Streams

The compact starter: Foundation, supporting structures, parallel processing

About the Book

This book is retired. Get the current edition at

Lambdas and Streams allow a concise functional programming style.Albeit very powerful, the lambda syntax looks strange at first glance and the developer needs to get familiarized.This books provides you a concise introduction into this matter

  • Share this book

  • Categories

    • Computers and Programming
    • Java
    • Functional Programming
  • Feedback

    Email the Author(s)

This book is a translation into English of Java Lambdas und (parallel) Streams which was originally written in German.

About the Author

Michael Müller
Michael Müller

Michael Müller is an IT professional with more than 35 years of experience including about 30 years in the healthcare sector. During this time, he has worked in different areas, especially project and product management, consulting, and software development. He gained international knowledge not only by targeting international markets, but also by leading external teams (from Eastern Europe and India).

Currently, he is head of IT (software development, infrastructure, operations) at the German DRG institute []. In this role, he is responsible for Web applications as well as other Java and .NET projects. Web projects are preferably built with Java technologies such as JSF with the help of supporting languages like JavaScript.

Michael is a JSF professional user and a member of the JSR 344 and JSR 372 (JSF) expert groups. Due to his community activities he was invited to join the NetBeans Dream Team and became a member January 2016.

He frequently reads books and writes reviews as well as technical papers, which are mostly published in German-printed magazines and on his website []. Beside that, he irregular blogs about software development [].

Michael likes to share his knowledge.

Enjoy his writings!

Table of Contents

    • Preliminary note
    • Cover image
    • Acknowledgements
    • About the Author
    • About this book
      • Conventions
      • Links
      • Errors and typos
      • Copyright
    • 1. Inroduction
      • 1.1 Lambdas and (Parallel) Streams
      • 1.2 The challenge
      • 1.3 The solution
      • 1.4 A first explanation
    • 2. The data
    • 3. First analysis - from naive to flexible
      • 3.1 Fix filter
      • 3.2 Simple parameterization
      • 3.3 Behavior parameterization
      • 3.4 Anonymous classes
    • 4. Lambda expressions
      • 4.1 Functional interface
      • 4.2 Lambda notation
      • 4.3 Lazy evaluation
      • 4.4 Summary
    • 5. Default method
      • 5.1 The problem
      • 5.2 Solution - The Java way
      • 5.3 Rules to choose a default method
      • 5.4 Summary
    • 6. Optional
    • 7. Make the acquaintance of Streams
      • 7.1 Examples
      • 7.2 Parallel processing
      • 7.3 Summary
    • 8. stream(), Stream and Spliterator
      • 8.1 Stream
      • 8.2 Spliterator
      • 8.3 Summary
    • 9. Parallel Stream
      • 9.1 Summary
    • 10. Collector and Concurrency
      • 10.1 Java concurrency
      • 10.2 Collect
      • 10.3 Summary
    • 11. Additional chapters
  • Appendix
    • Program to create the demo data
      • Basic data
      • Article
      • Persons
      • Other classes
      • Demo program
  • Notes

The Leanpub 60 Day 100% Happiness Guarantee

Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

Now, this is technically risky for us, since you'll have the book or course files either way. But we're so confident in our products and services, and in our authors and readers, that we're happy to offer a full money back guarantee for everything we sell.

You can only find out how good something is by trying it, and because of our 100% money back guarantee there's literally no risk to do so!

So, there's no reason not to click the Add to Cart button, is there?

See full terms...

80% Royalties. Earn $16 on a $20 book.

We pay 80% royalties. That's not a typo: you earn $16 on a $20 sale. If we sell 5000 non-refunded copies of your book or course for $20, you'll earn $80,000.

(Yes, some authors have already earned much more than that on Leanpub.)

In fact, authors have earnedover $13 millionwriting, publishing and selling on Leanpub.

Learn more about writing on Leanpub

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!

Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.

Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.

Learn more about writing on Leanpub