Copy/usr/libexec/java_home -V

lists one line per Java environment installed (and known to the /usr/bin/java command).

You can still have other Java distributions which are not registered. They are typically downloaded as ZIP files without an installer, or using another package manager like homebrew.

Mac OS X has a cool binary (/usr/libexec/java_home) that returns the path to a Java home directory from the current user's settings. You may want to issue:

Copy/usr/libexec/java_home -V

It prints the full JVM list with architectures like this:

CopyMatching Java Virtual Machines (2):
    13, x86_64: "OpenJDK 13"    /Library/Java/JavaVirtualMachines/openjdk-13.jdk/Contents/Home
    1.8.0_265, x86_64:  "AdoptOpenJDK 8"    /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/openjdk-13.jdk/Contents/Home

If you want to print the JAVA_HOME path of a specific JDK version, you can do it like this:

Copy/usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

You can see the complete usage options of below:

CopyUsage: java_home [options...]
    Returns the path to a Java home directory from the current user's settings.

Options:
    [-v/--version   <version>]       Filter Java versions in the "JVMVersion" form 1.X(+ or *).
    [-a/--arch      <architecture>]  Filter JVMs matching architecture (i386, x86_64, etc).
    [-d/--datamodel <datamodel>]     Filter JVMs capable of -d32 or -d64
    [-t/--task      <task>]          Use the JVM list for a specific task (Applets, WebStart, BundledApp, JNI, or CommandLine)
    [-F/--failfast]                  Fail when filters return no JVMs, do not continue with default.
    [   --exec      <command> ...]   Execute the $JAVA_HOME/bin/<command> with the remaining arguments.
    [-R/--request]                   Request installation of a Java Runtime if not installed.
    [-X/--xml]                       Print full JVM list and additional data as XML plist.
    [-V/--verbose]                   Print full JVM list with architectures.
    [-h/--help]                      This usage information.