How to know the current version of Java

If you have java set in your System Environment Variable (PATH/JAVA_HOME) by using the Command Line (CMD on Windows or Terminal or Linux/Mac) you can simply know which version of Java is set in the PATH and is currently in use, simply use the command java -version

% java -version
openjdk version "1.8.0_332"
OpenJDK Runtime Environment Corretto-8.332.08.1 (build 1.8.0_332-b08)
OpenJDK 64-Bit Server VM Corretto-8.332.08.1 (build 25.332-b08, mixed mode)

If you will use java -v you will get an error,

java -v
Unrecognized option: -v
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. The program will exit.

You can also know the version of Java Compiler utility using the command javac -version

% javac -version
javac 1.8.0_332