I found it a little surprising that Java's generics are a good fit for your task. Don't you have tons of boxed ints eating lots of memory? That's what I'm strug

I found it a little surprising that Java's generics are a good fit for your task. Don't you have tons of boxed ints eating lots of memory? That's what I'm struggling with a lot when I do graph processing in Java. At that point I tend to resort to C++. Or do you use fastutil?