MS FX trading IV

Q: what if someone successfully de-serializes a singleton? What's the value of that static field?

%A: null, but if it de-serializes into the same class loader as the original singleton, then the field will be non-null

%A: whether it's null or not, this new instance is usable. Whoever has a handle on this new instance can use it without calling getInstance().

Q: How do you prevent cloning of a singleton?
A: override Object.clone() to throw.

Q: a base class has a static method and field. Can subclass declare those same members?
%A: yes hiding.

Q: what's hiding vs overriding?
%A: compile-time vs runtime binding

Q: If I have a base type variable pointing to a derived object, and I call a static method defined in both, which version runs?
%A: base version, due to compile-time binding.

Q: what are the generations in a GC? Does an object jump from Eden to another generation or does it move incrementally?

Q: what objects are in each generation esp. the permanent generation?