Maybe this SO post can shed some light on the matter:
https://stackoverflow.com/questions/4343202/difference-between-super-t-and-extends-t-in-java
Here's also a small example you can play around with:
public static void main(String[] args) {
final Container container =new Container<>(new
A
Hi there,
I mostly work with Scala and don't know too much about the internal
machinery of Java.
There is something very confusing to me.
Since Java generics don't support type variations like Scala, why do you
have things like
```
public class TumblingEventTimeWindows extends WindowAssigner
```
