Uninstall Oracle Java on Mac OSX using the Terminal / Install AdoptOpenJDK using homebrew

gistfile1.txt

Remove Java from the Apple System Preferences Pane
----------------------------------------------------
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane 
sudo rm -fr ~/Library/Application\ Support/Oracle/Java

Install with Homebrew
---------------------
install Homebrew if you haven't already. Make sure it is updated:

brew update
brew tap homebrew/cask-versions
brew search java
brew cask info java

Install a specific version of the JDK such as java8, java9, java10, java11, java12, or just java for the current:
brew cask install java

The AdoptOpenJDK version is available as well now from Homebrew Cask:
brew cask install adoptopenjdk
Will be installed into /Library/Java/JavaVirtualMachines/ which is the traditional location expected on Mac OSX.

update your .bash_profile
--------------------------
export JAVA_8_HOME=$(/usr/libexec/java_home -v1.8)
export JAVA_12_HOME=$(/usr/libexec/java_home -v12)

alias java8='export JAVA_HOME=$JAVA_8_HOME'
alias java12='export JAVA_HOME=$JAVA_12_HOME'

export JAVA_HOME=$JAVA_12_HOME

reload bash or start a new terminal session
-------------------------------------------
source ~/.bash_profile

verify the new version
----------------------
which java && java -version