AdoptOpenJDK class documentation
We can use Javadoc published by Oracle
AdoptOpenJDK does not provide its own JDK/JVM. As stated on their website :
AdoptOpenJDK uses infrastructure, build and test scripts to produce prebuilt binaries from OpenJDK™ class libraries and a choice of either the OpenJDK HotSpot or Eclipse OpenJ9 VM.
So, essentially, they built OpenJDK. Oracle provides an OpenJDK build as long as the version has not reached its end of life. OpenJDK was then responsible for developing the OpenJDK project. However, since both JDKs pass the JCK-tests, they are direct replacements for each other. Therefore, you can use the official Oracle Javadoc.
As far as I know, OpenJDK doesn’t have a dedicated Javadoc homepage, although there is a corresponding issue in the AdoptOpenJDK github .