MacOS查看安装的jdk版本和目录

命令：/usr/libexec/java_home -V

iMac ~ % /usr/libexec/java_home -V
Matching Java Virtual Machines (1):
    1.8.0_212, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home
iMac ~ % 

已安装的：
Matching Java Virtual Machines (1):
版本： 1.8.0_212, x86_64: "Java SE 8"
安装路径：/Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home

默认使用的jdk路径：/Library/Java/JavaVirtualMachines/jdk1.8.0_212.jdk/Contents/Home