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Java 9 with JShell Cover

Java 9 with JShell

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

Publisher:Packt Publishing Limited
By: Gaston C. Hillar  
Paid access
|Sep 2025
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Explore Java 9 with JShell and UML

Key Features

  • 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

Book 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.

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

Who this book is 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.

Table of Contents

  1. JShell: A Read-Evaluate-Print-Loop for Java 9
  2. Objects from the real-world to UML diagrams and Java 9 in the JShell
  3. Classes and instances in Java 9
  4. Encapsulation of data
  5. Mutable and immutable classes
  6. Inheritance, abstraction, extension and specialization
  7. Members inheritance, typecasting and polymorphism
  8. Contract programming with interfaces
  9. Advanced Contract Programming with Interfaces
  10. Maximization of code reuse with generics in Java 9
  11. Advanced generics in Java 9
  12. Object-Oriented, Functional Programming and Lambda Expressions in Java 9
  13. Modularity in Java 9
https://github.com/packtpublishing/java-9-with-jshell
PDF ISBN: 978-1-78728-519-4
Publisher: Packt Publishing Limited
Copyright owner: © 2017 Packt Publishing Limited
Publication date: 2025
Language: English
Pages: 408
Related subjects:
Computer sciences,
Programming and languages

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