Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Java: High-Performance Apps with Java 9
Java: High-Performance Apps with Java 9

Java: High-Performance Apps with Java 9: Boost your application's performance with the new features of Java 9

Arrow left icon
Profile Icon Ramgir
Arrow right icon
€18.99 per month
Paperback Mar 2018 194 pages 1st Edition
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m
Arrow left icon
Profile Icon Ramgir
Arrow right icon
€18.99 per month
Paperback Mar 2018 194 pages 1st Edition
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€8.99 €26.99
Paperback
€32.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with a Packt Subscription?

Free for first 7 days. €18.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing
Table of content icon View table of contents Preview book icon Preview Book

Java: High-Performance Apps with Java 9

Chapter 2. Tools for Higher Productivity and Faster Application

Since the dawn of programming as a profession, the standing goals of every aspiring coder were to quickly produce applications that perform the assigned tasks with lightning speed. Otherwise, why bother? We could slowly do whatever we were doing for thousands of years. In the book of the last century, we made substantial progress in both aspects, and now, Java 9 makes another step in each of these directions.

Two new tools were introduced in Java 9, JShell and the Ahead-of-Time (AOT) compiler--both were expected for a long time. JShell is a Read–Eval–Print Loop (REPL) tool that is well-known for those who program in Scala, Ruby, or Python, for example. It takes a user input, evaluates it, and returns the result immediately. The AOT compiler takes Java bytecode and generates a native (system-dependent) machine code so that the resulting binary file can execute natively.

These tools will be the focus of...

The JShell Tool Usage

JShell helps a programmer to test fragments (snippets) of code as they are written. It shortens the time for development by avoiding the build-deploy-test part of the development cycle. Programmers can easily copy an expression or even several methods into the JShell session and run-test-modify them multiple times immediately. Such a quick turnaround also helps to understand the library API better before using it and to tune the code to express exactly its purpose, thus facilitating better quality software.

How often have we guessed what the JavaDoc for a particular API meant and wasted build-deploy-test cycles for figuring it out? Or we want to recall, how exactly the string will be split by substring(3)? Sometimes, we create a small test application where we run the code we are not sure about, using again the same build-deploy-test cycle. With JShell, we can copy, paste, and run. In this section, we will describe and show how to do it.

JShell is built on the top of...

Ahead-of-Time (AOT)

The big claim of Java was write-once-run-anywhere. It was achieved by creating an implementation of Java Runtime Environment (JRE) for practically all platforms, so the bytecode generated once from the source by Java compiler (javac tool) could be executed everywhere where JRE was installed, provided the version of the compiler javac was compatible with the version of JRE.

The first releases of JRE were primarily the interpreters of the bytecode and yielded slower performance than some other languages and their compilers, such as C and C++. However, over time, JRE was improved substantially and now produces quite decent results, on a par with many other popular systems. In big part, it is due to the JIT dynamic compiler that converts the bytecodes of the most frequently used methods to the native code. Once generated, the compiled methods (the platform-specific machine code) is executed as needed without any interpretation, thus decreasing the execution time.

To utilize...

The JShell Tool Usage


JShell helps a programmer to test fragments (snippets) of code as they are written. It shortens the time for development by avoiding the build-deploy-test part of the development cycle. Programmers can easily copy an expression or even several methods into the JShell session and run-test-modify them multiple times immediately. Such a quick turnaround also helps to understand the library API better before using it and to tune the code to express exactly its purpose, thus facilitating better quality software.

How often have we guessed what the JavaDoc for a particular API meant and wasted build-deploy-test cycles for figuring it out? Or we want to recall, how exactly the string will be split by substring(3)? Sometimes, we create a small test application where we run the code we are not sure about, using again the same build-deploy-test cycle. With JShell, we can copy, paste, and run. In this section, we will describe and show how to do it.

JShell is built on the top of...

Ahead-of-Time (AOT)


The big claim of Java was write-once-run-anywhere. It was achieved by creating an implementation of Java Runtime Environment (JRE) for practically all platforms, so the bytecode generated once from the source by Java compiler (javac tool) could be executed everywhere where JRE was installed, provided the version of the compiler javac was compatible with the version of JRE.

The first releases of JRE were primarily the interpreters of the bytecode and yielded slower performance than some other languages and their compilers, such as C and C++. However, over time, JRE was improved substantially and now produces quite decent results, on a par with many other popular systems. In big part, it is due to the JIT dynamic compiler that converts the bytecodes of the most frequently used methods to the native code. Once generated, the compiled methods (the platform-specific machine code) is executed as needed without any interpretation, thus decreasing the execution time.

To utilize...

Left arrow icon Right arrow icon

Key benefits

  • • Tackle all kinds of performance-related issues and streamline your development
  • • Dive into the new features of Java 9
  • • Implement highly efficient and reliable code with the help of new APIs of Java
  • • Embedded with assessments that will help you revise the concepts you have learned in this book

Description

Java 9 which is one of the most popular application development languages. The latest released version Java 9 comes with a host of new features and new APIs with lots of ready to use components to build efficient and scalable applications. Streams, parallel and asynchronous processing, multithreading, JSON support, reactive programming, and microservices comprise the hallmark of modern programming and are now fully integrated into the JDK. This book focuses on providing quick, practical solutions to enhance your application's performance. You will explore the new features, APIs, and various tools added in Java 9 that help to speed up the development process. You will learn about jshell, Ahead-of-Time (AOT) compilation, and the basic threads related topics including sizing and synchronization. You will also explore various strategies for building microservices including container-less, self-contained, and in-container. This book is ideal for developers who would like to build reliable and high-performance applications with Java. This book is embedded with useful assessments that will help you revise the concepts you have learned in this book. This book is repurposed for this specific learning experience from material from Packt's Java 9 High Performance by Mayur Ramgir and Nick Samoylov

Who is this book for?

This book is targeted at developers who would like to build reliable and high-performance applications with Java.

What you will learn

  • • Familiarize with modular development and its impact on performance
  • • Learn various string-related performance improvements, including compact string and modify string concatenation
  • • Explore various underlying compiler improvements, such as tiered attribution and Ahead-of-Time (AOT) compilation
  • • Learn security manager improvements
  • • Understand enhancements in graphics rasterizers
  • • Use of command-line tools to speed up application development
  • • Learn how to implement multithreading and reactive programming
  • • Build microservices in Java 9
  • • Implement APIs to improve application code

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 13, 2018
Length: 194 pages
Edition : 1st
Language : English
ISBN-13 : 9781789130515
Vendor :
Oracle
Category :
Languages :
Tools :

What do you get with a Packt Subscription?

Free for first 7 days. €18.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing

Product Details

Publication date : Mar 13, 2018
Length: 194 pages
Edition : 1st
Language : English
ISBN-13 : 9781789130515
Vendor :
Oracle
Category :
Languages :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 116.97
Cloud-Native Applications in Java
€41.99
Java: High-Performance Apps with Java 9
€32.99
Test-Driven Java Development, Second Edition
€41.99
Total 116.97 Stars icon
Banner background image

Table of Contents

6 Chapters
1. Learning Java 9 Underlying Performance Improvements Chevron down icon Chevron up icon
2. Tools for Higher Productivity and Faster Application Chevron down icon Chevron up icon
3. Multithreading and Reactive Programming Chevron down icon Chevron up icon
4. Microservices Chevron down icon Chevron up icon
5. Making Use of New APIs to Improve Your Code Chevron down icon Chevron up icon
A. Assessment Answers Chevron down icon Chevron up icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is included in a Packt subscription? Chevron down icon Chevron up icon

A subscription provides you with full access to view all Packt and licnesed content online, this includes exclusive access to Early Access titles. Depending on the tier chosen you can also earn credits and discounts to use for owning content

How can I cancel my subscription? Chevron down icon Chevron up icon

To cancel your subscription with us simply go to the account page - found in the top right of the page or at https://subscription.packtpub.com/my-account/subscription - From here you will see the ‘cancel subscription’ button in the grey box with your subscription information in.

What are credits? Chevron down icon Chevron up icon

Credits can be earned from reading 40 section of any title within the payment cycle - a month starting from the day of subscription payment. You also earn a Credit every month if you subscribe to our annual or 18 month plans. Credits can be used to buy books DRM free, the same way that you would pay for a book. Your credits can be found in the subscription homepage - subscription.packtpub.com - clicking on ‘the my’ library dropdown and selecting ‘credits’.

What happens if an Early Access Course is cancelled? Chevron down icon Chevron up icon

Projects are rarely cancelled, but sometimes it's unavoidable. If an Early Access course is cancelled or excessively delayed, you can exchange your purchase for another course. For further details, please contact us here.

Where can I send feedback about an Early Access title? Chevron down icon Chevron up icon

If you have any feedback about the product you're reading, or Early Access in general, then please fill out a contact form here and we'll make sure the feedback gets to the right team. 

Can I download the code files for Early Access titles? Chevron down icon Chevron up icon

We try to ensure that all books in Early Access have code available to use, download, and fork on GitHub. This helps us be more agile in the development of the book, and helps keep the often changing code base of new versions and new technologies as up to date as possible. Unfortunately, however, there will be rare cases when it is not possible for us to have downloadable code samples available until publication.

When we publish the book, the code files will also be available to download from the Packt website.

How accurate is the publication date? Chevron down icon Chevron up icon

The publication date is as accurate as we can be at any point in the project. Unfortunately, delays can happen. Often those delays are out of our control, such as changes to the technology code base or delays in the tech release. We do our best to give you an accurate estimate of the publication date at any given time, and as more chapters are delivered, the more accurate the delivery date will become.

How will I know when new chapters are ready? Chevron down icon Chevron up icon

We'll let you know every time there has been an update to a course that you've bought in Early Access. You'll get an email to let you know there has been a new chapter, or a change to a previous chapter. The new chapters are automatically added to your account, so you can also check back there any time you're ready and download or read them online.

I am a Packt subscriber, do I get Early Access? Chevron down icon Chevron up icon

Yes, all Early Access content is fully available through your subscription. You will need to have a paid for or active trial subscription in order to access all titles.

How is Early Access delivered? Chevron down icon Chevron up icon

Early Access is currently only available as a PDF or through our online reader. As we make changes or add new chapters, the files in your Packt account will be updated so you can download them again or view them online immediately.

How do I buy Early Access content? Chevron down icon Chevron up icon

Early Access is a way of us getting our content to you quicker, but the method of buying the Early Access course is still the same. Just find the course you want to buy, go through the check-out steps, and you’ll get a confirmation email from us with information and a link to the relevant Early Access courses.

What is Early Access? Chevron down icon Chevron up icon

Keeping up to date with the latest technology is difficult; new versions, new frameworks, new techniques. This feature gives you a head-start to our content, as it's being created. With Early Access you'll receive each chapter as it's written, and get regular updates throughout the product's development, as well as the final course as soon as it's ready.We created Early Access as a means of giving you the information you need, as soon as it's available. As we go through the process of developing a course, 99% of it can be ready but we can't publish until that last 1% falls in to place. Early Access helps to unlock the potential of our content early, to help you start your learning when you need it most. You not only get access to every chapter as it's delivered, edited, and updated, but you'll also get the finalized, DRM-free product to download in any format you want when it's published. As a member of Packt, you'll also be eligible for our exclusive offers, including a free course every day, and discounts on new and popular titles.