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Add initial documentation for Java-based packages

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# Homebrew and Java
This page describes how Java is handled in Homebrew for users. Prospective formula authors may refer to existing Java-based formulae for examples of how to install packages written in Java via Homebrew, or visit the [Homebrew discussion forum](https://github.com/Homebrew/discussions/discussions) to seek guidance for their specific situation.
Most Java-based packages in Homebrew use the default Homebrew-provided `openjdk` package for their JDK dependency, although some packages with specific version requirements may use a versioned package such as `openjdk@8`.
## Executing commands using a different JDK
In situations where the user wants to override the use of the Homebrew-provided JDK, setting the `JAVA_HOME` environment variable will cause the specified location to be used as the Java home directory instead of the version of `openjdk` specified as a dependency.