简书链接:mac的java安装目录
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/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home
https://blog.csdn.net/wengyupeng/article/details/52410564
打开终端，执行 /usr/libexec/java_home -V

MacBook-Air:~ eng$ /usr/libexec/java_home -V
Matching Java Virtual Machines (4):
1.8.0_101, x86_64: “Java SE 8” /Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home
1.7.0_79, x86_64: “Java SE 7” /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
1.6.0_65-b14-466.1, x86_64: “Java SE 6” /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
1.6.0_65-b14-466.1, i386: “Java SE 6” /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home

默认JDK1.6(Apple自带JDK)路径： /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

默认JDK1.7、1.8(Oracle) Home : /Library/Java/JavaVirtualMachines/jdk1.8.0_101.jdk/Contents/Home

环境设置

export JAVA_HOME=$(/usr/libexec/java_home)
export PATH=$JAVA_HOME/bin:$PATH
export CLASS_PATH=$JAVA_HOME/lib 需要说明的是Mac OSX 10.5之后苹果就建议设置$JAVA_HOME变量到/usr/libexec/java_home，添加完毕之后，按esc退出插入模式，并键入wq!保存退出文件。