Set JAVA_HOME at the command line. Automatically set JAVA_HOME. Java installers have come a long way over the years. In the past to install Java one had to download ZIP files, with manual extractions ...

To be precise, say if you have installed Java in the path C:\Program Files\Java\jdk1.8.0_121 on your computer, ... Set JAVA_HOME environment variable & update the system path.

java -version java version "1.8.0_202" Java(TM) SE Runtime Environment (build 1.8.0_202-b08) Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode) jenv doctor [OK] No JAVA_HOME set [OK] ...