How can I install java openjdk 8 on High Sierra or newer macOS
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