Self-Review Exercises
10.1 Fill in the blanks in each of the following statements:
a) If a class contains at least one abstract method, it’s a(n) ________ class.
b) Classes from which objects can be instantiated are called ________ classes.
c) ________ involves using a superclass variable to invoke methods on superclass and sub-class objects, enabling you to “program in the general.”
d) Methods that are not interface methods and that do not provide implementations must be declared using keyword _______.
e) Casting a reference stored in a superclass variable to a subclass type is called _______.
10.2 State whether each of the statements that follows is true or false. If false, explain why.
a) All methods in an abstract class must be declared ...
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