Book Image

Learning Java Lambdas

By : Toby Weston
Book Image

Learning Java Lambdas

By: Toby Weston

Overview of this book

In this short book, we take an in-depth look at lambdas in Java, and their supporting features. The book covers essential topics, such as functional interfaces and type inference, and the key differences between lambdas and closures. You will learn about the background to functional programming and lambdas, before moving on to understanding the basic syntax of lambdas and what differentiates these anonymous functions from standard anonymous classes. Lastly, you'll learn how to invoke lambdas and look at the bytecode generated. After reading this book, you'll understand lambdas in depth, their background, syntax, implementation details, and how and when to use them. You'll also have a clear knowledge of the difference between functions and classes, and why that's relevant to lambdas. This knowledge will enable you to appreciate the improvements to type inference that drive a lot of the new features in modern Java, and will increase your understanding of method references and scoping.

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Table of Contents (10 chapters)
Learning Java Lambdas
Learning Java Lambdas
Credits
Credits
About the Author
About the Author
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Introduction
Introduction
The road to modern Java
2
Lambdas Introduction
Lambdas Introduction
λs in functional programming
Functions vs classes
λ basic syntax
3
Lambdas in Depth
Lambdas in Depth
Functional interfaces
Type inference improvements
Method references
Scoping
Exception handling
Lambdas vs closures
Bytecode recap
Descriptors
Converting a method signature
Code examples
Example 1
Example 2
Example 3
Example 4
Example 4 (with method reference)
Example 5
Summary
Bytecode
Bytecode
WaitFor
Example 1
Example 2
Example 3
Example 4
Example 4 (with Method Reference)
Example 5

Learning Java Lambdas

Copyright © 2017 Toby Weston

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: March 2017

Production reference: 1290317

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham 

B3 2PB, UK.

ISBN 978-1-78728-208-7

www.packtpub.com

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