Install Oracle's implementation of the Java Platform, Standard Edition Development Kit (JDK 8).Do not install either JDK 9 or JDK 10, as they are currently incompatible with DrJava.Log in to the user account in which you will be programming.Your account must have Administrator privileges (with a non-blank password)and you must be connected to the Internet.Here is a flowchart that might help guide you in choosing a source for Java 11.Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, and the standard libraries from our textbook. This approach using rapid delivery train with LTS is new in the Java world. Free-of-cost implementations may also receive updates under LTS from some providers. This applies, at least, customers paying a commercial vendor. This means the version will receive updates and fixes for years instead of months. Versions 8 and 11 are both LTS, as will be version 17. The exception is that every three years, the sixth release in succession shall be designated a Long-Term Support (LTS) version. However, these versions may not be supported free-of-cost with patches after the successive version arrives. These are production-ready fully-tested releases. Every six months a new version arrives, as discussed in this article.

Oracle and the Java community have adopted a faster cadences for releases, a fashion known as the Release Train.

Note that Java development has changed recently.

Java 12, not yet released for production, runs on High Sierra as well. The implementations of Java 8, 9, 10, and 11 based on OpenJDK from vendors such as Azul Systems, Oracle, and AdoptOpenJDK run on macOS High Sierra and Mojave (and some older macOS as well).

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