Deck 10: Object-Oriented Programming

Question 1

A class specifies a set of instance variables and methods that are "bundled together" for defining a type of object.

Answer 1

True

Question 2

A class can be used to make as many object instances of that type as needed.

Answer 2

True

Question 3

The mere use of objects constitutes object-oriented programming.

Answer 3

False

Question 4

Object-oriented programming languages provide three fundamental features that support a programming paradigm in which computation occurs as message passing between objects.

Question 5

The three fundamental features of an object-oriented programming language that support object-oriented development are __________________, _________________, and __________________.

Question 6

In procedural programming, the focus is on variables and the passing of variables to functions, whereas in object-oriented programming, the focus is on _____________ and _____________________________.

Question 7

Encapsulation provides a form of information hiding.

Question 8

Private members of a class in Python begin and end with two underscore characters.

Question 9

Information hiding is a form of abstraction.n.

Question 10

Getters and setters are methods providing controlled access to private instance variables.

Question 11

The def keyword is used to define classes, just as it is used to define functions.

Question 12

There is no means in Python for accessing the private members of a class.

Question 13

Name mangling occurs when the identifiers within a class are not sufficiently distinct.

Question 14

Functions serving as methods of a given class must have an extra first parameter, which by convention is named self.

Question 15

Although methods are defined as functions in Python, methods cannot raise an exception as regular functions can.

Question 16

Special methods are methods that are automatically called in Python.

Question 17

Special methods __repr__ and __str__ both produce the same string representation of a given object's value.

Question 18

There are special methods in Python corresponding to both arithmetic and relational operators.

Question 19

Selected members of a class can be made inaccessible ("hidden") from its clients, referred to as

A) blocked access
B) information hiding
C) information integrity
D) information management

Question 20

What keyword is used to define a new class in Python?

A) class
B) def
C) new
D) declare

Question 21

What is the name of the special method to initialized instance variables in Python?

A) __assign__
B) __set__
C) __init__
D) __initialize__

Question 22

Which of the following is the correct way to access private instance variable x in object a of type ClassA?

A) a.__x
B) a.__x__
C) a._ClassA__x
D) a.__ClassA__x

Question 23

Special Methods are defined with

A)two underscores before the method name
B) two underscores after the method name
C) two underscores before and after the method name
D) the key word special before the method definition

Question 24

_______________ is a fundamental feature of object-oriented programming languages that allows for information hiding.

Question 25

Private members of a class in Python must begin with two ________________ characters.

Question 26

Information hiding provides a form of ____________________.

Question 27

________ and _________ are methods providing controlled access to private instance variables.

Question 28

______________________ is used in Python to indicate that particular members of a class are to be considered private.

Question 29

Functions in Python meant to serve as methods of a particular class must have an added first parameter, by convention named ___________.

Question 30

Special methods are predefined methods in Python that are automatically called, with names that begin and end with two ___________________ characters.

Question 31

The two methods that are implemented to display the value of a given object are named__________ and ___________.

Question 32

For an XYCoord class that stores x and y private instance variables, how should the variables be named?

Question 33

Give appropriate getter and setter methods for an XYCoord class containing private instance variables x and y.

Question 34

Give an appropriate __init__ method for a class named FullName that stores the first and last name of a given individual. Assume that the class contains (private) instance variables first_name and last_name.

Question 35

For person1, an object instance of class FullName containing private instance variables first_name and last_name, indicate how each of these instance variables can be directly accessed from outside the class.

Question 36

For a class named FullName that contains an __init__ method that is passed a first and last name to construct a new object with, give an instruction that creates a new object of type FullName containing the name "Yu Huang."

Question 37

Give the __str__ method for a class named FullName that contains the first and last name of an individual, such that the name is displayed (when printed) in the form lastname, firstname. Assume that the class contains (private) instance variables first_name and last_name.

Question 38

For a class named Money that stores a dollar and cent amount, give an appropriate __add__ method. Assume that the class contains (private) instance variables dollars and cents. (Note: the cent amount stored should be in the range 0 to 99.)

Question 39

For a class named Money that stores a dollar and cent amount, give an appropriate __eq__ method that determines if two Money values are equal. (Note: the cent amount stored in Money objects is in the range 0 to 99.)

Question 40

Inheritance, in object-oriented programming, is the ability of a class to inherit members of another class as part of its own definition.

Question 41

The can be only one class defined for a given parent class in Python.

Question 42

There can be multiple levels of subclasses for a given class.

Question 43

All subclasses can serve as a subtype of its parent class.

Question 44

Another name for a subclass is a _____________ class or _____________ class.

Question 45

Another name for a superclass is a _____________ class or _____________ class.

Question 46

A _____________ is something that can be substituted for and behave as its parent type.

Question 47

Built-in function _______ can be used to determine the type (class name) of any value in Python.

Question 48

Built-in function _______ can be used to get the class description of a built-in type in Python.

Question 49

For class FullName that contains an __init__ method that is passed a first and last name to construct a new object with, define a subclass of the FullName class named FullNamePlus that also stores a person's middle name. The subclass should include an __init__ method, getter/setter methods, and a __str__ methods that displays a name in the form lastname, firstname middlename. (Assume that class FullName contains getter methods accessing the first and last names.)

Question 50

In object-oriented programming, polymorphism allows objects of different types, each with their own specific behaviors, to be treated as the same general type.

Question 51

A class in which one or more methods are unimplemented (or only implemented to raise an exception) is called an abstract class.

Question 52

The word polymorphism derives from Greek meaning:

A) something of a particular form
B) something with no particular form
C) something that can take many forms
D) something that can take any form

Question 53

Duck typing, used in Python, refers to the fact that:

A) all class types can be placed in order
B) all class types are automatically "imprinted" to be of type object
C) any class type can be redefined at runtime
D) any set of classes with a common set of methods, even if not subclasses of a common type,
Can be treated similarly

Question 54

A class with one or more unimplemented methods is called an __________ class.

Question 55

in Python, any set of classes with a common set of methods, even if not subclasses of a common type, can be treated similarly. This kind of typing is called ___________________.

Question 56

Give the definition of an abstract class named Currency that stores a currency amount (as an integer value). Include in the class an __init__ method and an abstract __str__ method. Define three subclasses of the Currency class named USCurrency (dollars), EuroCurrency (euros), and the ChineseCurrency (yuan). Implement the __str__ method of each so that the proper currency symbol is displayed. The Unicode string for displaying Euro and Chinese currency symbols are '\u20AC' and '\u5143, respectively.

Question 57

UML is a specification language specifically for specifying the design of Python programs.

Question 58

UML is a graphical programming language.

Question 59

A class diagram in UML is used to specify the static aspects of an object-oriented design.

Question 60

Interaction diagrams in UML are used to represent the interactions of the user of a given program.

Question 61

The most common relationship between classes is a UML class diagram is association.

Question 62

Multiplicity in a UML class diagrams refers to the total number of relationships defined between classes.

Question 63

Aggregation in UML defines a "part of" relationship.

Question 64

Role names are used to describe an association between two classes.

Question 65

The + and - symbols in UML class diagrams are used to denote

A) public and private access
B) instance variables and method members
C) built-in and user-defined classes
D) abstract and concrete methods

Question 66

Subclass relationships in UML are indicated by use of a solid line with a(n)

A) arrowhead
B) black square
C) closed arrowhead
D) black diamond

Question 67

A class that groups together a set of objects that exist independently of that class is referred to as

A) composition
B) aggregation
C) accumulation
D) multiplicity

Question 68

Match the descriptions with their terms:

-indicates the direction of method calls made

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 69

Match the descriptions with their terms:

-indicates a part-of relationship

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 70

Match the descriptions with their terms:

-indicates that the methods of one class are called by the methods of the other

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 71

Match the descriptions with their terms:

-indicates a grouping of classes

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 72

Match the descriptions with their terms:

-indicates the number of objects that may be associated

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 73

Match the descriptions with their terms:

-describes an association between two classes

A) association
B) navigation
C) multiplicity
D) composition
E) aggregation
F) role names

Question 74

Two types of diagrams in UML are _________ diagrams that express the static aspects of an object-oriented design, and _________ diagrams that denote the sequence of methods calls at execution time.

Question 75

The three sections of a class as denoted in UML are ____________, ______________, and __________.

Question 76

Initialization methods like __init__ in Python are named ______________ in UML.

Question 77

The direction of method calls between two classes can be optionally specified in UML by the use of ______________.

Question 78

_______________ in a UML class diagrams is used to indicate the number of objects that may be associated with an object of another type.

Question 79

____________ in UML class diagrams is indicated by the use of a filled diamond head, while __________ is indicated by use of an unfilled diamond head.

Question 80

Denote in UML a Fraction class with private instance variables numer and denom, an __init__ method, setter and getter methods, a method for properly displaying a fraction value, a method for adding two fraction values (such that the '+' symbol can be used, returning a Fraction result), and a method for comparing if two given Fraction objects are equal (using the '==' symbol, returning a Boolean result).