Secondary development Based on java

I’d like to do some secondary development for nextcloud by java. But I haven‘t found some demo or APIs and usage description for APIs. so, I need some suggestions from you. Regard sincerely.

Something like this?

Not everything seems to be up to date (, some apps also provide API stuff that might not be documented here.

I’ll move to the development section…

not really. I need RESTFUl API or demo based on java.

we don’t have that.

ok, thank you all the same.