What's New in Java 8
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What's New in Java 8

An unofficial guide to Java and JDK 1.8

About the Book

If you're just getting to Java 8, I definitely recommend@adamldavis' book -- very concise and helpful. -Fred Jonsson

Java 8 is a giant step forward for the Java language. In Project Lambda, Java gets a new closure syntax (lambda expressions), method-references, and default and static methods on interfaces. It manages to add many of the features of functional languages without losing the clarity and simplicity Java developers have come to expect. In addition, many of the existing Java core library classes have been enhanced with the new Streams API.

This ebook will help you understand Java 8, including: Project Lambda, the new Date-Time API, Streams, default methods, Nashorn, and more.

This book is 100% complete and available in print here and other places.

If you like this, please check out Adam's other books: Learning Groovy, Modern Java Second Edition, and Modern Programming Made Easy

10% of all proceeds go directly to the Electronic Frontier Foundation (EFF).

DisclaimerJava is a registered trademark of Oracle. You can find Java here on Oracle's website.

About the Author

Adam L. Davis
Adam L. Davis

Adam Davis makes software. He's spent many years developing in Java (since Java 1.2) and has enjoyed using Spring, Hibernate, Grails, and many others. He has used Java, Groovy, JavaScript, AWS, and much more to build applications for over a decade and has worked at both large and small corporations. Adam is a Certified Spring Professional and has a Masters and a Bachelors degree in Computer Science from Georgia Tech.


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Table of Contents

  • Preface
  • 1. Overview
  • 2. Lambda Expressions
    • 2.1 Syntax
    • 2.2 Scope
    • 2.3 Method references
    • 2.4 Functional Interfaces
    • 2.5 Comparisons to Java 7
  • 3. Default Methods
    • 3.1 Default and Functional
    • 3.2 Multiple Defaults
    • 3.3 Static Methods on Interface
  • 4. Streams
    • 4.1 What is a Stream?
    • 4.2 Generating Streams
    • 4.3 For Each
    • 4.4 Map/Filter/Reduce
    • 4.5 Parallel Array
    • 4.6 Peek
    • 4.7 Limit
    • 4.8 Sort
    • 4.9 Collectors and Statistics
    • 4.10 Grouping and Partitioning
    • 4.11 Comparisons to Java 7
  • 5. Optional
  • 6. Nashorn
    • 6.1 jjs
    • 6.2 Scripting
    • 6.3 ScriptEngine
    • 6.4 Importing
    • 6.5 Extending
    • 6.6 Invocable
  • 7. New Date and Time API
    • 7.1 New Classes
    • 7.2 Creation
    • 7.3 Enums
    • 7.4 Clock
    • 7.5 Period and Duration
    • 7.6 Temporal Adjusters
    • 7.7 Instant
    • 7.8 Time Zones
    • 7.9 Backwards Compatibility
  • 8. No More Permanent Generation
  • 9. Miscellaneous
    • 9.1 Base64
    • 9.2 CompletableFuture
    • 9.3 Annotations on Java Types
    • 9.4 Repeating Annotations
  • 10. Functional Programming in Java 8
    • 10.1 Functions
    • 10.2 Immutability
    • 10.3 Concurrency
    • 10.4 Tail-Call Optimization
  • 11. Conclusion
  • Backports
  • Contact the Author
  • Notes

Causes Supported

Electronic Frontier Foundation

Defending your civil liberties in a digital world.

Based in San Francisco, EFF is a donor-supported membership organization working to protect fundamental rights regardless of technology.

From the Internet to the iPod, technologies are transforming our society and empowering us as speakers, citizens, creators, and consumers. When our freedoms in the networked world come under attack, the Electronic Frontier Foundation (EFF) is the first line of defense. EFF broke new ground when it was founded in 1990—well before the Internet was on most people's radar—and continues to confront cutting-edge issues defending free speech, privacy, innovation, and consumer rights today. From the beginning, EFF has championed the public interest in every critical battle affecting digital rights.

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