What happens when an object is dereferenced but its member object is still referenced?

Question

class ClassA {
    ClassB mem1 = new ClassB();
    ClassB mem2 = new ClassB();
}

class ClassB {
}

public class Sample {
    public static void main(String[] args)          


        

Answer 1

After obj1 is no longer referenced, it becomes eligible for garbage collection. mem1 still has a reference, so if java were to garbage-collect at this point, obj1 and mem2 it points too would be freed, but mem1 would remain untouched as obj2 still points to it.

Of course, after obj2 = null, it can also be collected.