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Actually this is also the only easy macOS OpenJDK install solution I've found so far.

It's like nvm (for Node.js) but for installing JDKs.

On linux you can use your package manager + alternative system.

There is also Azul Zulu Homebrew cask available, but last I checked it was a couple of patch version behind.

I've been using their ZuluVM distribution for a few years, and I've been very happy with it.

direct download without any registration !