Learning Java Lambdas : an in-depth look at one of the most important features of modern Java / Toby Weston.

Format:

Book

Author/Creator:

Weston, Toby, author.

Language:

English

Subjects (All):

Functional programming (Computer science).

Functions--Computer programs.

Functions.

Java (Computer program language).

Physical Description:

1 online resource (100 pages)

Edition:

1st edition

Place of Publication:

Birmingham, England : Packt Publishing, 2017.

System Details:

text file

Biography/History:

Weston Toby: Toby Weston - Independent Software DeveloperI specialise in modern software development; functional and object-oriented programming, agile and lean best practice. I wrote the book Essential Acceptance Testing and have written for magazines as well as regularly blogging. I've been part of the software industry for more than fifteen years and love what I do. I love talking and writing about it and sharing my experiences online with Udemy.

Summary:

Understand and utilize Java Lambdas About This Book Take a deep dive into one of the single most important additions to modern Java Master Java lambdas, and fully understand functions, classes, and scope. Improve your programming skills, which will enable you to write cleaner and more dynamic code Who This Book Is For Learning Java Lambdas is for developers looking to upgrade their Java skills and familiarize themselves with one of the most important new features of Java. This book is not for absolute beginners and will be more suited to professionals who are already comfortable with Java coding. You should have a basic knowledge of Java before reading this book. What You Will Learn What a lambda is and how it differs from other Java features How to use lambdas effectively in your own projects The use of method references and advanced scoping The difference between lambdas and closures The differences in bytecode produced when using lambdas In Detail 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. Style and approach This book is a deep dive into one of the core new features of the Java language ? Lambdas. It covers them in great details, making sure that you fully understand how lambdas work, and how they can be put to use in your own programs.

Contents:

Cover

Copyright

Credits

About the Author

www.PacktPub.com

Customer Feedback

Table of Contents

Preface

Chapter 1: Introduction

The road to modern Java

Modern Java features

Chapter 2: Lambdas Introduction

λs in functional programming

1930s and the lambda calculus

1950s and LISP

What is a lambda

Functions vs classes

Lambdas in modern Java

Some theoretical differences

Some concrete differences

Capture semantics

Shadowed variables

Summary

λ basic syntax

Syntax breakdown

Chapter 3: Lambdas in Depth

Functional interfaces

@FunctionalInterface

Extension

Other interface improvements

Type inference improvements

Java type inference

Target-typing for lambdas

Type parameters in method calls

Type parameters in chained method calls

Method references

Example

Method reference types

Constructor reference

Static method reference

Instance method reference of particular object (in this case, a closure)

Instance method reference of a arbitrary object whose instance is supplied later (lambda)

Scoping

Effectively final

Circumventing final

Exception handling

Using a callback

Dealing with exceptions when writing lambdas

As a caller (dealing with exceptions when calling lambdas)

Lambdas vs closures

Basic differences

Other differences

Bytecode recap

Descriptors

Converting a method signature

Code examples

Example 1

Example 2

Example 3

Example 4

Example 4 (with method reference)

Example 5

Appendix: Bytecode

WaitFor

Example 4 (with Method Reference)

Index.

Notes:

Includes index.

Description based on online resource; title from PDF title page (ebrary, viewed April 21, 2017).

ISBN:

9781787281028

1787281027

OCLC:

983202669