Java™ How To Program (Early Objects), Tenth Edition

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 ...