Chapter 6. Experimenting with the Java Shell

In the previous chapter, we explored how to migrate pre-Java 9 applications to the new Java platform. We examined several issues that might cause your current applications to have problems running on Java 9. We started with a review of Project Jigsaw and then looked at how modules fit into the new Java platform. We provided you with insights and processes to get your Java 8 code working with Java 9. Specifically, we provided tips for migration planning, shared advice from Oracle regarding migration, and shared tools that you can use to help you as you get started with Java 9.

In this chapter, we will take our first look at the new command line, read-eval-print loop (also referred to as REPL) tool in Java 9, the Java Shell (JShell). We will start with introductory information regarding the tool, the read-eval-print loop concept, and move into the commands and command-line options for use with JShell. We will take a practitioner's approach to our...