Book Image

Mastering Java 11 - Second Edition

By : Dr. Edward Lavieri, Mandar Jog
Book Image

Mastering Java 11 - Second Edition

By: Dr. Edward Lavieri, Mandar Jog

Overview of this book

Java 11 is a long-term release and its new features add to the richness of the language. It emphasizes variable-type inference, performance improvements, along with simplified multithreading. The Java platform has a special emphasis on modularity, making this the programming platform of choice for millions of developers. The modern Java platform can be used to build robust software applications, including enterprise-level and mobile applications. Fully updated for Java 11, this book stands to help any Java developer enjoy the richness of the Java programming language. Mastering Java 11 is your one-stop guide to fully understanding recent Java platform updates. It contains detailed explanations of the recent features introduced in Java 9, Java 10, and Java 11 along with obtaining practical guidance on how to apply the new features. As you make your way through the chapters, you'll discover further information on the developments of the Java platform and learn about the changes introduced by the variable handles and Project Coin, along with several enhancements in relation to import statements processing. In the concluding chapters, you'll learn to improve your development productivity, making your applications more efficient. You'll also be able to get to grips with the command-line flags with respect to various utilities and the command-line utility changes featured in the current Java platform. By the end of the book, you'll have obtained an advanced level understanding of the Java platform and its recent changes.
Table of Contents (20 chapters)

Getting started with JShell

JShell is a command-line tool that is located in the /bin folder. The syntax for this tool is as follows:

jshell <options> <load files>

As you can see in the following screenshot, there are several options that can be used with this tool:

You have already seen the -h option, which we executed with jshell -h. This provided the listing of JShell options.

To log into your JShell, you can simply use the jshell command. You will see that the prompt in the command window changes accordingly:

Exiting the shell is as easy as entering /exit. Once inside the JShell, you can enter any of the following commands:

Command Functionality
/drop

Use this command to delete a source entry that is referenced by name or id.

Here is the syntax:

/drop <name or id>

/edit

With this command, you can edit a source entry using name or id reference...