参看： http://www.baeldung.com/java-home-on-windows-7-8-10-mac-os-x-linux
From OS X 10.5, Apple introduced a command line tool (/usr/libexec/java_home) which dynamically finds the top Java version specified in Java Preferences for the current user.
Open ~/.bash_profile in any text editor and add:
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export JAVA_HOME=$(/usr/libexec/java_home) |
Save and close the file.
Open a Terminal and run the source command to apply the changes:
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source ~/.bash_profile |
Now we can check the value of the JAVA_HOME variable:
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echo $JAVA_HOME |
The result should be the path to the JDK installation:
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/Library/Java/JavaVirtualMachines/jdk1.8.0_111.jdk/Contents/Home |
来源：https://www.cnblogs.com/carol-wei/p/7836699.html