How can I install java openjdk 8 on High Sierra or newer macOS How do I install OpenJDK 8 on High Sierra or newer macOS?
It looks like support for the Java Oracle JDK version 8 will be deprecated after January 2019 Java SE Overview
Additionally, it looks like publishing and distributing Docker containers with the Oracle Java JDK may not be legal Running Java on Docker
Fastest Solution

Use the adoptopenjdk cask

See also https://discourse.brew.sh/t/how-to-install-openjdk-with-brew/712/4 

To install latest:

brew cask install adoptopenjdk


To install a specific version

brew tap AdoptOpenJDK/openjdk
brew cask install adoptopenjdk8
brew cask install adoptopenjdk9


Manual Solution

If you are looking to just bring down the binary without actually installing it, simply navigate to https://adoptopenjdk.net