This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
As I see it you cannot. Because your anonymous inner class is a SUBCLASS of Popcorn and is being accessed by a reference of type Popcorn. So only methods defined in Popcorn (or its superclasses etc) can be accessed.