[JAVA] Check the version of the JDK installed and the version of the JDK enabled

1. Check the installed JDK version

Execute the following command.

/usr/libexec/java_home -V

Execution result

$ /usr/libexec/java_home -V
Matching Java Virtual Machines (3):
    12.0.1, x86_64:	"AdoptOpenJDK 12"	/Library/Java/JavaVirtualMachines/adoptopenjdk-12.jdk/Contents/Home
    11.0.3, x86_64:	"AdoptOpenJDK 11"	/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home
    1.8.0_212, x86_64:	"AdoptOpenJDK 8"	/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

2. Check the version of JDK that is enabled

Execute the following command.

java -version

Execution result

$ java -version
openjdk version "12.0.1" 2019-04-16
OpenJDK Runtime Environment AdoptOpenJDK (build 12.0.1+12)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 12.0.1+12, mixed mode, sharing)

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