Static Fragment retains Activity's static variables?

Question

I have a static Fragment with setRetainInstance(true) inside an Activity, and this Fragment uses an Activity's member static variable. I see that after an orientation change the value of that static variable is retained without need to saving it on Activity's onSaveInstanceState(). Can someone explain to me why? Thanks

Answer 1

Static members belong to the class itself and not to the instances of that class. Check here for a simple example:

https://www.caveofprogramming.com/java/java-for-beginners-static-variables-what-are-they.html

Answer 2

Static members aren't tied to the Activity lifecycle.