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Key benefits

• A full account of Java 9’s new features

• This tutorial emphasises fluency using JShell exercises

• Get a thorough introduction to contract programming code reuse via Java generics

• Learn how to use the new module system

• How to use proper functional programming style inside Java 9

Description

The release of Java 9 has brought many subtle and not-so-subtle changes to the way in which Java programmers approach their code. The most important ones are definitely the availability of a REPL, known as JShell, which will make experiments and prototyping much more straightforward than the old IDE-based project-led approach. Another, more subtle change can be seen in the module system, which will lead to more modularized, maintainable code. The techniques to take full advantage of object-oriented code, functional programming and the new modularity features in Java 9 form the main subjects of this book. Each chapter will add to the full picture of Java 9 programming starting out with classes and instances and ending with generics and modularity in Java.

Who is this book for?

This book can be understood by anyone who is a graduate of computer science or someone who has just begun working as a software engineer. Basically, an understanding of an object-oriented programming language like Python, C++ or indeed, an earlier Java version is sufficient. It would be helpful to have participated in the full product cycle of a software engineering project.

What you will learn

• Engage with object-oriented programming in Java 9, starting with code snippets in JShell

• Optimize your code, applying functional programming features

• Discover the advantages of modularity

• Become very proficient at using JShell itself

• Learn the new approach to Java programming, which uses the REPL as a prototyping tool

What do you get with a Packt Subscription?

Free for first 7 days. $19.99 p/m after that. Cancel any time!

Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!

50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.

Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.

Thousands of reference materials covering every tech concept you need to stay up to date.

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ares09x Apr 30, 2017

Three things:1) The author seems to assume that the reader knows something about O-O languages; it's definitely not for those new to O-O.2) There are a few errors in the end-of-chapter "test your knowledge" questions.3) There's a major problem in Chapter 9 - the section called "Downcasting with interfaces and classes" is not about downcasting, it's about upcasting. When you go up a class or interface hierarchy, as the examples in this section do, from a more specific class or interface to a more general one, you are upcasting. Downcasting is treating an object that is declared as a more general type as if it were a more specific type. So, in the author's example, treating a SpiderDog object as though it were a DrawableInComic object is upcasting; treating an object declared to be of type DrawableInComic as though it were a SpiderDog object is downcasting.Note: this problem may be corrected in the paperback version, I obtained a pdf version of this book.

Amazon Verified review

Markus W. Apr 27, 2017

"Introducing the full range of Java 9's new features via JShell" is the subtitle of this book.More than half of the book is about basic concepts of object oriented programming. For a professional knowing his/her Java these chapters are completely useless.Neither default methods in interfaces nor generics or functional programming with lambda are new to Java 9. The new Stream methods iterate, takeWhile, dropWhile, and ofNullable to be introduced with Java 9 are not even mentioned.The pages are filled with repeated examples and how they are evaluated/displayed in JShell (pleeease, show me one or two examples, not the same five times with different values).But nonetheless learners would have a hard time with this book, too, because the author repeatedly uses concepts without introducing them properly. Ten pages with skecthes of geometric shapes shall lead you to abstraction and inheritance, without defining these concepts at this point. Base classes and interfaces are mixed chapters before they are discussed in detail. The author talks about the benefits of constructors, switches to garbage collection, and only afterwards really tells you what a constructor is.And more basic concepts (data types, variables, methods, conditions, loops) are missing completely, so no chance to learn the language with this book. Even collections appear at one point in the examples out of nowhere.Furthermore some of the presented ideas are misleading. Using immutable objects to prevent problems with concurrent programs is neither the solution to thread safe programs nor the sense of immutable objects.The description of the Jigsaw modularity system new to Java 9 lacks important features, e.g. how to integrate new code with existing one (designed for Java 8 or lower) or how to open modules for reflection, and only provides a basic idea.Even the introduction to JShell is quite basic, not a word about how to set the classpath or modulepath in JShell--which you will need to work with this tool productively.Other changes in the tooling around Java 9 or new API components are completely ignored.Of course, this is an early shot at Java 9 (and an expensive one), but neither will it present you the full range of new features nor is it an introduction for starters. Maybe programmers proficient in other languages but new to Java could benefit from the book. But even for them there will be better introductions to Java 9 soon.

Java 9 with JShell: Introducing the full range of Java 9's new features via JShell

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