This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
You can't tell for sure. The object referenced to by c1 originally might not be eligible for garbage collection, because it might have been assigned to a different reference inside f(). Also, we can't tell if there are additional objects that could be garbage collected inside MyClass without knowing the structure of the class.
All code in my posts, unless a source is explicitly mentioned, is my own.