[layer8]

JDKs are just a directory tree. Not sure what you mean on Windows, you simply unpack the JDKs to whatever directories you want, and set PATH and/or JAVA_HOME according to which you want to use, and/or switch them in your IDE.

[rimmontrieu]

The advantage of using a package manager like scoop or chocolatey is that you have a unified interface to manage multiple versions of JDK, and you can switch the default version system-wide on the fly, regardless of your IDE:

  scoop bucket add java

  # Install JDK 11
  scoop install java/temurin11-jdk
  # Install JDK 17
  scoop install java/temurin17-jdk
  # Use JDK 11
  scoop reset temurin11-jdk
  # Use JDK 17
  scoop reset temurin17-jdk

I also wrote a short guide on my website: https://raizensoft.com/tutorial/install-java-gamedev/

[layer8]

Thanks, but what does “the default version system-wide” mean, other than setting environment variables or replacing the JDK in a fixed location?

[rimmontrieu]

You can do that manually but it's tedious if you want to use multiple JDKs. Assuming you want to test two apps outside of an IDE, one only supports Java 8 API, and the other supports Java 21 API, you don't want to edit JAVA_HOME every time you switch back and forth between the two apps.

With scoop you can just launch the terminal and run `scoop reset [java-version]`