Mac 查看下查看已安装的 Java JDK 版本及其安装目录

只需要一个简单的命令

/usr/libexec/java_home -V

比如我的输出如下

Matching Java Virtual Machines (3):
    11.0.1, x86_64: "OpenJDK 11.0.1"    /Library/Java/JavaVirtualMachines/openjdk-11.0.1.jdk/Contents/Home
    1.8.0_202, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home
    1.8.0_201, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home

/Library/Java/JavaVirtualMachines/openjdk-11.0.1.jdk/Contents/Home

最后一行表示当前的 Java 所在目录，这个我们可以通过 java -version 来核实

openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)

或者通过 ls -lh /usr/bin/java 来查看

/usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java