If you have just updated your macOS and want to know what version of Java you have already, the easiest way is to check the java version using the terminal.
$ java -version
$ java -version
java version "11"
Java(TM) SE Runtime Environment (build 11)
Java HotSpot(TM) 64-Bit Server VM (build 23.2-b04, mixed mode)
If you have multiple JDK installed you can find them under /Library/Java/JavaVirtualMachines directory.
To run a specific version of Java on macOS you can make use of JAVA_HOME,
Example:
$ /usr/libexec/java_home -v 15 --exec javac -version
Identify installed Java (JDK) Version on macOS
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