Android™ How to Program, Second Edition

Self-Review Exercises (Sections G.6–G.13)

G.3 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 subclass 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 _____________.

G.4 State whether each of the statements that follows is true or false. If false, explain why.

a) All methods ...