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Java 9 Programming By Example

You're reading from   Java 9 Programming By Example Your guide to software development

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781786468284
Length 504 pages
Edition 1st Edition
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Author (1):
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Peter Verhas Peter Verhas
Author Profile Icon Peter Verhas
Peter Verhas
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Table of Contents (11) Chapters Close

Preface 1. Getting Started with Java 9 2. The First Real Java Program - Sorting Names FREE CHAPTER 3. Optimizing the Sort - Making Code Professional 4. Mastermind - Creating a Game 5. Extending the Game - Run Parallel, Run Faster 6. Making Our Game Professional - Do it as a Webapp 7. Building a Commercial Web Application Using REST 8. Extending Our E-Commerce Application 9. Building an Accounting Application Using Reactive Programming 10. Finalizing Java Knowledge to a Professional Level

Functional programming in Java


Since we have created a lot of code in our example for this chapter, we will look at the functional programming features of Java, which will help us delete many lines from our code. The less code we have, the easier it is to maintain the application; thus, programmers love functional programming. But this is not the only reason why functional programming is so popular. It is also an excellent way to describe certain algorithms in a more readable and less error prone manner than conventional loops.

Functional programming is not a new thing. The mathematical background was developed for it in the 1930s. One of the first (if not the first) functional programming languages is LISP. It was developed in the 1950s and it is still in use, so much that there is a version of the language implemented on the JVM (Clojure).

Functional programming, in short, means that we express the program structure in terms of functions. In this meaning, we should think of functions as...

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