A. Dynamic Binding: When a super class type of object is declared, the reference(for instance, x) can point to either a _________ class object or a _________class object. If a method (say, do()) in super class is overridden in the subclass, in the above case, will x.do() call the super class version or sub class version? Down casting: if a super class reference points to a subclass object, and a "subclass only" method is called, a downcasting is needed to make the call otherwise compile time error will occur. B. Interfaces: The story of last digit. How many interfaces can a class implement? why? Can interface type be used to declare objects? C. Abstract Classes: What if a class implements only part of the interface? Can abstract classes become super classes? What if the abstract methods are not implemented in sub classes either? D. Comparable Interface: public interface Comparable{
int compareTo(Object obj);
} E. Challenge of the Week: All MC questions of Chapter 4.
