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Java 8 Lambdas Richard Warburton Download Full High Quality Version for Free at ruthenpress.info Read "Java 8 Lambdas Pragmatic Functional Programming" by Richard Warburton available from Rakuten Kobo. Sign up today and get $5 off your first. Editorial Reviews. Book Description. Functional Programming for the Masses. About the Author. Richard is an empirical technologist and solver of deep-dive.
Default methods in a nutshell 9. Usage patterns for default methods 9. Optional methods 9. Multiple inheritance of behavior 9. Resolution rules 9. Three resolution rules to know 9. Most specific default-providing interface wins 9.
Conflicts and explicit disambiguation 9. Diamond problem Using Optional as a better alternative to null How do you model the absence of a value? Reducing NullPointerExceptions with defensive checking Problems with null What are the alternatives to null in other languages? Introducing the Optional class Patterns for adopting Optional Creating Optional objects Extracting and transforming values from optionals with map Chaining Optional objects with flatMap Default actions and unwrapping an optional Combining two optionals Rejecting certain values with filter Practical examples of using Optional Wrapping a potentially null value in an optional Exceptions vs.
Optional Putting it all together Summary CompletableFuture: composable asynchronous programming A common thread is how much easier it is to read code using the new Streams API to manipulate objects and collections, such as filtering out albums that were made in the UK from a List of all albums.
For many people, what Java 8 offers by way of functional programming is incredibly limited: This is the only mention of this word in this book. Who Should Read This Book? This book is aimed squarely at Java developers who already have core Java SE skills and want to get up to speed on the big changes in Java 8.
I assume that you already know about all of these elements. How to Read This Book This book is written in an example-driven style: This approach also lets you try out the ideas as you go along.
In fact, at the end of most chapters there are further examples for you to practice on your own. I highly recommend that you try doing these katas as you get to the end of the chapter. Because the use of lambda expressions is all about abstracting complexity away into libraries, I introduce a bunch of common library niceties as I go along.
Chapters 2 through 6 cover the core language changes and also the improved libraries that JDK 8 brings. The final three chapters are about applying functional programming in the wild. Chapter 8 explains how existing principles of good software design also apply to lambda expressions. These chapters also introduce third-party libraries, where relevant.
The latter chapters are more complex, but they also teach you how to be a more complete programmer who can confidently use lambda expressions in your own designs.
There are also exercises as you go along, and the answers to these can be found on GitHub. Conventions Used in This Book The following typographical conventions are used in this book: Italic Indicates new terms, URLs, email addresses, filenames, and file extensions. Constant width Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords. Constant width bold Shows commands or other text that should be typed literally by the user.
This element signifies a tip or suggestion. This element indicates a warning or caution. Using Code Examples Supplemental material code examples, exercises, etc.
This book is here to help you get your job done.
In general, if example code is offered with this book, you may use it in your programs and documentation. For example, writing a program that uses several chunks of code from this book does not require permission.
Answering a question by citing this book and quoting example code does not require permission. We appreciate, but do not require, attribution.
An attribution usually includes the title, author, publisher, and ISBN. For example: Copyright Richard Warburton, For more information about Safari Books Online, please visit us online. How to Contact Us Please address comments and questions concerning this book to the publisher: You can access this page at http: To comment or ask technical questions about this book, send email to bookques tions oreilly.
For more information about our books, courses, conferences, and news, see our website at http: Find us on Facebook: It was great to be introduced to Meghan by Martijn and Ben to begin with; this book would never have happened without that meeting.
Martijn in particular has been hugely helpful with his battle-won advice on writing a technical book. It would also be remiss of me to ignore the Project Lambda development team at Oracle. The London Java Community also deserves its share of praise for being so actively involved and supportive when helping to test out the early Java release and making it so easy to see what kinds of mistakes developers make and what can be fixed.
A lot of people have been incredibly supportive and helpful while I was going through the effort of writing a book. It has also been great to have encouragement and positive comments from friends such as old compsoc members, especially Sadiq Jaffer and the Boys Brigade.
Java 1. Businesses are requiring ever more complex applications, and most programs are executed on machines with powerful multicore CPUs. The elephant in the room is the rise of multicore CPUs. The java. There are limits to the level of abstractions that library writers can use in Java today. A good example of this is the lack of efficient parallel operations over large collections of data.
Java 8 allows you to write complex collection-processing algorithms, and simply by changing a single method call you can efficiently execute this code on multicore CPUs.
In order to enable writing of these kinds of bulk data parallel libraries, however, Java needed a new language change: Abstraction is a concept that is familiar to us all from object-oriented programming. The difference is that object-oriented programming is mostly about abstracting over data, while functional programming is mostly about abstracting over behavior.
The real world has both of these things, and so do our programs, so we can and should learn from both influences.
There are other benefits to this new abstraction as well. Easier-to-read code is also easier to maintain, more reliable, and less error-prone.
Being able to pass functions around easily also makes it easier to write lazy code that initializes values only when necessary. In addition, the language changes that enable the additional collection methods, de fault methods, can be used by everyday programmers who are maintaining their own libraries.
What Is Functional Programming? Functional programming is a term that means different things to different people. At the heart of functional programming is thinking about your problem domain in terms of immutable values and functions that translate between them.
The communities that have developed around different programming languages each tend to think that the set of features that have been incorporated into their language are the key ones. In this book, I focus on pragmatic functional programming, including techniques that can be used and understood by most developers and that help them write programs that are easier to read and maintain.
Specifically, the examples represent the kind of information you might see on albums.