In this section, we will add the Java kernel to your installation. The steps are very similar, regardless of whether you're installing in a Windows or a macOS environment.
The Java kernel, IJava, was developed and maintained by Spence Park at https://github.com/SpencerPark/IJava. There are a couple of requirements for using the Java kernel, which will be covered in the following sections.
You can check the version of Java you have installed by using the following command at a command-line prompt:
java --versionWe need version 9 or later.
Also, the installed version must be a JDK. The JRE will not suffice. You can download the latest Java version at www.oracle.com/technetwork/java. At the time of writing this book, version 10 was generally available so I installed that version, as you can see from the following screenshot:
