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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

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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...

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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

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 13, 2018
Length: 194 pages
Edition : 1st
Language : English
ISBN-13 : 9781789133370
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Oracle
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Product Details

Publication date : Mar 13, 2018
Length: 194 pages
Edition : 1st
Language : English
ISBN-13 : 9781789133370
Vendor :
Oracle
Category :
Languages :

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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
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