Chapter 8 - Objects and Classes

Question 1

How many classes in a file can be a public class?

Answer 1

Only one.

Question 2

Constructors are a special kind of method. What are their three peculiarities?

Answer 2

A constructor must have the same name as the class itself.
Constructors do not have a return type, not even void.
Constructors are invoked using the new operator when an object is created. Constructors play the role of initializing objects.

Question 3

___ represents an entity in the real world that can be distinctly identified

Answer 3

A class

Question 4

__ is a construct that defines objects of the same type

Answer 4

A class

Question 5

An object is an instance of a __

Answer 5

class

Question 6

__ is invoked to create an object

Answer 6

A constructor

Question 7

Given the declaration Circle x = new Circle(), which of the following statement is most accurate
x contains an int value
x contains an object of the Circle type
x contains a reference to a Circle object
you can assign an int value to x

Answer 7

x contains a reference to a Circle object

Question 8

The default value for data field of a boolean type, numeric type, object type is ____, respectively

Answer 8

false, 0, null