Installing Java 8 & Java 11 on macOS BigSur with Homebrew

Install Homebrew

$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

I had an issue with macOS Big Sur (11.2.3)

zsh: command not found: brew

So I added and it was resolved

$ export PATH=/opt/homebrew/bin:$PATH

Add Homebrew TAP

$ brew tap <tabname>

I added tabname as AdoptOpenJDK/openjdk

$ brew tap AdoptOpenJDK/openjdk

Install AdoptOpenJDK with Homebrew TAP

$ brew install --cask <version>

Install Java 8 with Homebrew Tap

$ brew install --cask adoptopenjdk8

Install Java 11 with Homebrew Tap

$ brew install --cask adoptopenjdk11

Export and add alias

For switching Java version

Add these command in .zshrc file

export JAVA_8_HOME=$(/usr/libexec/java_home -v1.8)
alias java8='export JAVA_HOME=$JAVA_8_HOME'
export JAVA_11_HOME=$(/usr/libexec/java_home -v11)
alias java11='export JAVA_HOME=$JAVA_11_HOME'

Run this command after saving

$ source ~/.zshrc

Switch and check Java version

Switch to Java 8, use java8 and check Java version

$ java8
$ java -version

Switch to Java 11, use java11 and check Java version

$ java11
$ java -version

References

https://medium.com/w-logs/installing-java-11-on-macos-with-homebrew-7f73c1e9fadf

https://github.com/Homebrew/discussions/discussions/902

https://stackoverflow.com/questions/36657321/after-installing-brew-i-get-command-not-found-brew/36805293