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Introducing
Java 8
A Quick-Start Guide to Lambdas
and Streams
Raoul-Gabriel Urma
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©2015 O’Reilly Media, Inc. The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. #15305
Introducing Java 8
Raoul-Gabriel Urma
Introducing Java 8
by Raoul-Gabriel Urma
Copyright © 2015 O’Reilly Media, Inc. All rights reserved.
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August 2015:
First Edition
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Revision History for the First Edition
2015-08-20:
2015-09-02:
First Release
Second Release
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The O’Reilly logo is a registered trademark of O’Reilly Media, Inc.
Introducing Java 8
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978-1-491-93434-0
[LSI]
Table of Contents
1. Java 8: Why Should You Care?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Code Readability
Multicore
A Quick Tour of Java 8 Features
1
3
3
2. Adopting Lambda Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Why Lambda Expressions?
Lambda Expressions Defined
Lambda Expression Syntax
Where to Use Lambda Expressions
Method References
Putting It All Together
Testing with Lambda Expressions
Summary
The Need for Streams
What Is a Stream?
Stream Operations
Filtering
Matching
Finding
Mapping
Reducing
Collectors
Putting It All Together
Parallel Streams
Summary
11
13
13
14
15
16
18
18
19
20
21
21
22
22
23
23
24
24
26
27
3. Adopting Streams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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