Java: Generational GC

Using a reachability analysis. Frame the concept in practical terms so you can explain it during interview discussion.

Java uses a reachability analysis to determine if an object is unreachable. It starts from GC roots and follows references to check if an object can be reached. If not, the object is considered unreachable and eligible for garbage collection. For instance, objects no longer referenced by any active thread or static fields can become unreachable after a reachability check.