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While the term "lambda expression" may sound abstract and academic, Java 8 Lambdas can have a big impact on how you program every day. In simplest terms, a lambda expression is a function—a bit of code—that you can pass to another method as an argument. Thus, you can cope with changing requirements by using a behavior, represented by a lambda, as a parameter. Java 8's functional programming features, like lambdas and the new Stream API that enables a cleaner way to iterate through collections, can help you write concise, maintainable code that scales easily and performs well on multicore architectures.

Java 8 in Action is a clearly-written guide to Java 8 lambdas and functional programming in Java. It begins with a practical introduction to the structure and benefits of lambda expressions in real-world Java code. The book then introduces the Stream API and shows how it can make collections-related code radically easier to understand and maintain. Along the way, you'll discover new FP-oriented design patterns with Java 8 for code reuse, code readability, exception handling, data manipulation, and concurrency. For developers also exploring other functional languages on the JVM, the book concludes with a quick survey of useful functional features in Scala.

Raoul-Gabriel Urma has worked as a software engineer for Oracle's Java Platform Group, Google's Python team, Ebay, and Goldman Sachs as well as for several startup projects. He's currently completing a PhD in Computer Science at the University of Cambridge and is a regular speaker and instructor. Mario Fusco is a senior software engineer at Red Hat working on Drools, the JBoss rule engine. He created the open source library lambdaj, an internal Java DSL for manipulating collections in a functional way. Alan Mycroft is Professor of Computer Science at the University of Cambridge, where he researches programming languages, their semantics, optimization and implementation. He is a co-founder and Trustee of the Raspberry Pi Foundation.

You can follow Raoul and Mario on Twitter at @raoulUK and @mariofusco.

Table of Contents
PART I: FUNDAMENTALS
1 Java 8: why should you care? - FREE
2 Passing code with behavior parameterization - AVAILABLE
3 Lambda expressions - AVAILABLE
PART II: FUNCTIONAL-STYLE DATA PROCESSING
4 Processing data with streams - AVAILABLE
5 Collecting data with streams - AVAILABLE
6 Parallel data processing and performance - AVAILABLE
PART III: EFFECTIVE JAVA 8 PROGRAMMING
7 Refactoring, testing, debugging - AVAILABLE
8 Default methods - AVAILABLE
9 Optional: a better alternative to null - AVAILABLE
10 CompletableFuture: composable asynchronous programming - AVAILABLE
11 New Date and Time API - AVAILABLE
PART IV: BEYOND JAVA 8
12 Thinking functionally - AVAILABLE
13 Functional programming techniques - AVAILABLE
14 Blending OOP and FP: comparing Java 8 and Scala - AVAILABLE
15 Conclusions and "where next" for Java - FREE
APPENDICES:
A Miscellaneous language updates - AVAILABLE
B Miscellaneous library updates - AVAILABLE
C Performing multiple operations in parallel on a Stream - AVAILABLE
D Lambdas and bytecode - AVAILABLE
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