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Java Lambdas
and Parallel
Streams
—
Michael Müller

JAVA LAMBDAS AND
PARALLEL STREAMS
Michael Müller

Java Lambdas and Parallel Streams
Michael Müller
Brühl, Nordrhein-Westfalen,
Germany
ISBN-13 (pbk): 978-1-4842-2486-1 ISBN-13 (electronic): 978-1-4842-2487-8
DOI 10.1007/978-1-4842-2487-8
Library of Congress Control Number: 2016960327
Copyright © 2016 by Michael Müller
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole
or part of the material is concerned, specifically the rights of translation, reprinting, reuse
of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physi-
cal way, and transmission or information storage and retrieval, electronic adaptation, com-
puter software, or by similar or dissimilar methodology now known or hereafter developed.
Trademarked names, logos, and images may appear in this book. Rather than use a trade-
mark symbol with every occurrence of a trademarked name, logo, or image we use the
names, logos, and images only in an editorial fashion and to the benefit of the trademark
owner, with no intention of infringement of the trademark.
The use in this publication of trade names, trademarks, service marks, and similar terms,
even if they are not identified as such, is not to be taken as an expression of opinion as to
whether or not they are subject to proprietary rights.
While the advice and information in this book are believed to be true and accurate at the
date of publication, neither the authors nor the editors nor the publisher can accept any
legal responsibility for any errors or omissions that may be made. The publisher makes no
warranty, express or implied, with respect to the material contained herein.
Managing Director: Welmoed Spahr
Lead Editor: Steve Anglin
Technical Reviewer: Kishori Sharan
Editorial Board: Steve Anglin, Pramila Balan, Laura Berendson, Aaron Black,
Louise Corrigan, Jonathan Gennick, Robert Hutchinson, Celestin Suresh John,
Nikhil Karkal, James Markham, Susan McDermott, Matthew Moodie,
Natalie Pao, Gwenan Spearing
Coordinating Editor: Mark Powers
Copy Editor: Deanna Hegle
Compositor: SPi Global
Indexer: SPi Global
Artist: SPi Global
Distributed to the book trade worldwide by Springer Science+Business Media New York,
233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax (201)
348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress
Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business
Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.
For information on translations, please e-mail rights@apress.com, or visit www.apress.com.
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Any source code or other supplementary materials referenced by the author in this text are
available to readers at www.apress.com. For detailed information about how to locate your
book’s source code, go to www.apress.com/source-code/. Readers can also access source
code at SpringerLink in the Supplementary Material section for each chapter.
Printed on acid-free paper

To my wife Claudia and my kids:
ank you for your patience during night-
writing and other long sessions.
I love you.
To the many people I conversed with at
conferences as well as attendees of my
talks:
ank you for the informative and
interesting conversations. From that, I
recognized how important the matter of
Java Lambdas and Streams is for you and
how much information demand exists.
Without you, this book would not have
been written.
To you, my dear reader:
ank you for your interest in this book.
I hope I wrote an understandable and
valuable book, which helps you to achieve
success.

Contents
About the Author. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
About the Technical Reviewer. . . . . . . . . . . . . . . . . . . . . . ix
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .1
Chapter 2: The Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Chapter 3: First Analysis—From Naive to Flexible . . . .7
Chapter 4: Lambda Expressions . . . . . . . . . . . . . . . . . .13
Chapter 5: Default Method . . . . . . . . . . . . . . . . . . . . . .19
Chapter 6: Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Chapter 7: Make the Acquaintance of Streams . . . . . .29
Chapter 8: stream(), Stream and Spliterator. . . . . . . .35
Chapter 9: Parallel Stream . . . . . . . . . . . . . . . . . . . . . .41
Chapter 10: Collector and Concurrency . . . . . . . . . . . .47
Chapter 11: GroupingCollector. . . . . . . . . . . . . . . . . . . .61
Appendix A: Program to Create the Demo Data . . . . .69
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
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