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

Table of Contents

JShell – A Read-Evaluate-Print-Loop for Java 9

Real-World Objects to UML Diagrams and Java 9 via JShell

Classes and Instances

Encapsulation of Data

Mutable and Immutable Classes

Inheritance, Abstraction, Extension, and Specialization

Members Inheritance and Polymorphism

Contract Programming with Interfaces

Advanced Contract Programming with Interfaces

Maximization of Code Reuse with Generics

Advanced Generics

Object-Oriented, Functional Programming, and Lambda Expressions

Modularity in Java 9

Exercise Answers