Java 9 Early Access: A Hands-on Session with JShell - The Java REPL | Takipi Blog
JShell / Project Kulla is the first official Java REPL (Read-Eval-Print-Loop), a command line tool that lets you run Java statements on their own without having to wrap them in classes or methods. Similar in a way to Python's interpreter, or to other JVM languages that natively support REPL like Scala and Groovy. Among the upcoming features of Java 9, it's definitely one of the more interesting ones. To check out more exciting features (apart from Project Jigsaw!) that are coming to the JDK near you, you can read a previous post of ours around the top 5 features in Java 9 that will change how you code. Up until now, if you wanted to REPL in Java you could have used alternatives like repl.it which has multi langauge support or the unofficial Java REPL project. With Java 9 though, REPL is bundled right into the JDK together with the langtools package.
Fun fact #2: Another OpenJDK project with a mythological name is project Valhalla; aiming beyond Java 9, and working on features like value types and reified generics. Definitely badass.
But enough with that, let's fire it up and see what it can do. In the following short terminal recoding we're going through a quick test run with JShell v0.61 (There's a known issue with OSX 10.10.3 where the prompt mixes with some of the output so please don't mind that, it'll probably be fixed soon):
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