One of the more interesting features of Java 9 is undoubtedly JShell, Java’s Read-Eval-Print-Loop implementation. REPL can be a valuable addition to your workflow and introduces patterns that will make you more effective when prototyping. This session shows you how to get started with JShell and shares a few tips and tricks that will make your life easier. Devoxx US 2017

1. #DevoxxUS
REPL: Java developer’s
new friend
Miro Cupak
Senior Software Engineer, DNAstack
22/03/2017
@mirocupak#jshellintro

2. #DevoxxUS
JShell
• interactive tool to execute Java and get immediate results
• JDK’s Read-Eval-Print-Loop
• use cases:
• learning
• switching stacks
• prototyping
• investigating new APIs
@mirocupak#jshellintro

3. #DevoxxUS
More info
• /help
• API: import jdk.jshell.*
• JEP 222: jshell: The Java Shell (Read-Eval-Print Loop)
• http://openjdk.java.net/jeps/222
• Kulla
• http://openjdk.java.net/projects/kulla/
• Robert Field: JShell: An Interactive Shell for the Java Platform
• Thursday 12:00-12:50 PM (LL 20 D)
@mirocupak#jshellintro

4. #DevoxxUS
Questions?
@mirocupak#jshellintro