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
Taking Notes with Monumentum

Practical uses of JShell

Whether you are a new or seasoned developer or just new to Java, you are bound to find the JShell very useful. In this section, we will look at some practical uses of JShell. Specifically, we will cover:

  • Feedback modes
  • Listing your assets
  • Editing in the JShell

Feedback modes

Command-line tools usually provide relatively sparse feedback in an effort to not overcrowd the screen or otherwise become a nuisance to developers. JShell has several feedback modes in addition to giving developers the ability to create their own custom modes.

As you can see from the following screenshot, there are four feedback modes--concise, normal, silent, and verbose. Here, we entered the /set feedback command without any parameters to list the feedback modes as well as to identify what the current feedback mode is. The first line of output displays the command-line command and argument set that would be used to set the mode to the currently set mode. So, in the following screenshot, the current...