The problem with Android is even if Google add more support to the new futures in java it would take at least 3 years until the developers could actually use it, how could he make an app that run only on less than 5% in the first year so yeah android will be ALWAYS late in adding new java future, there is only one solution to this use KOTLIN, just kidding probably updateing the last 3 or 4 last android version but that would be IMPOSSIBLE seince google is’ not the responcibe on the updates on most android phone, this is going off topic, but Androisneed to find a way to keep up with Java since Oracle boosting Java we want to expect more from android expected new UI and support for the stupid notch, BTW… ok this going off topic I need to stop.
In 3D games performance and memory losses from using Java are not comparable with advantages of faster development and easier project management 
Also, using shaders reduces the weight that JVM would do on CPU. OP instead talks about optimizing very little sizes of memory and specific parts, so i think this discussion goes over the macro-architecture of the software and instead concentrate on a single algorithm implementation.
it doesn’t create garbase on desktop after some time because normal java has escape analysis. 
In this condition, and after that time, or if you do this, or if this condition exists, if and if and or if and or…
Or you use SafeArrayList and remove all of the IFs ands ors, etc…
something-more-than-0 versus 0. For the cost of a declaration.