How to change environment variables in macOS?

Question

Java

I need to change the version of the Java language (16) to Java 1.8
When installing Java, I don’t even understand where it installs it, it doesn’t say anything, damn it, where to look

Answer 1

Good afternoon! I prefer to use
sdkman
https://sdkman.io/install
sdk install java {version}
sdk use java {version}