Book Image

Java 9: Building Robust Modular Applications

By : Dr. Edward Lavieri, Peter Verhas, Jason Lee
Book Image

Java 9: Building Robust Modular Applications

By: Dr. Edward Lavieri, Peter Verhas, Jason Lee

Overview of this book

Java 9 and its new features add to the richness of the language; Java is one of the languages most used by developers to build robust software applications. Java 9 comes with a special emphasis on modularity with its integration with Jigsaw. This course is your one-stop guide to mastering the language. You'll be provided with an overview and explanation of the new features introduced in Java 9 and the importance of the new APIs and enhancements. Some new features of Java 9 are ground-breaking; if you are an experienced programmer, you will be able to make your enterprise applications leaner by learning these new features. You'll be provided with practical guidance in applying your newly acquired knowledge of Java 9 and further information on future developments of the Java platform. This course will improve your productivity, making your applications faster. Next, you'll go on to implement everything you've learned by building 10 cool projects. You will learn to build an email filter that separates spam messages from all your inboxes, a social media aggregator app that will help you efficiently track various feeds, and a microservice for a client/server note application, to name just a few. By the end of this course, you will be well acquainted with Java 9 features and able to build your own applications and projects. This Learning Path contains the best content from the following two recently published Packt products: • Mastering Java 9 • Java 9 Programming Blueprints
Table of Contents (33 chapters)
Title Page - Courses
Packt Upsell - Courses
Preface
25
Taking Notes with Monumentum
Bibliography
Index

Chapter 18. Managing Processes in Java

With a very quick tour through some of the big new features of Java 9, as well as those from a couple of previous releases, let's turn our attention to applying some of these new APIs in a practical manner. We'll start with a simple process manager.

While having your application or utility handle all of your user's concerns internally is usually ideal, occasionally you need to run (or shell out to) an external program for a variety of reasons. From the very first days of Java, this was supported by the JDK via the Runtime class via a variety of APIs. Here is the simplest example:

    Process p = Runtime.getRuntime().exec("/path/to/program"); 

Once the process has been created, you can track its execution via the Process class, which has methods such as getInputStream(), getOutputStream(), and getErrorStream(). We have also had rudimentary control over the process via destroy() and waitFor(). Java 8 moved things forward by adding destroyForcibly() and waitFor...