Yoshida Shinya is an OpenJDK committer on the JEP 222, JShell , also called project Kulla. The Jshell in JDK 9 would enable developers to use a read–eval–print loop (REPL), a shell interface that would facilitate the learning and testing of Java 9. In the video below, Yoshida demonstrates how to use the JShell tool to test code, use JShell API with other tools, and his JavaFX plug-in for JShell. Watch his demos