How can you understand which objects will be released by the garbage collector in memory?

The garbage collector in Java frees objects that are no longer referenced from active parts of the program. To understand which objects will be removed, it is necessary to determine which objects have become unreachable — that is, not referenced by any variable or other object accessible from the root points (GC roots). For example, if an object is not accessible from the call stack, static variables, or JNI, it is considered a candidate for garbage collection.