Object Orientation and Generic Programming

Question 1

Why do we use a class diagram?

Answer 1

Represents a static view of an application

Question 2

What are the types being modelled within a system with a class diagram?

Answer 2

Classes
Interfaces
Data types
Components

Question 3

What is the order of components on class diagram box (top to bottom)

Answer 3

Class Name
Class Attributes
Class Operations

Question 4

How do you write an attribute in a class diagram box?

Answer 4

name : attribute type

Question 5

How do you write an operation in a class diagram box?

Answer 5

name(parameter : type) return type

Question 6

How to you write Zero or One?

Answer 6

0..1

Question 7

What is 0..* or *

Answer 7

Zero or more

Question 8

How to identify a multiplicity of “exactly three”

Answer 8

3

Question 9

How to identify a multiplicity of “two to four”

Answer 9

2..4

Question 10

What is the short hand for an aggregation relationship?

Answer 10

has-a

Question 11

What is a reflexive association?

Answer 11

A class that is associated with itself (employee)

Question 12

What do you use to organize a model’s classes?

Answer 12

Package

Question 13

Why use an interface class?

Answer 13

Because you want to implement it.

Question 14

What is the visibility symbol for public?

Answer 14

+

Question 15

What is the visibility symbol for private?

Answer 15

-

Question 16

What is the visibility symbol for protected?

Answer 16

#

Question 17

What is the visibility symbol for package?

Answer 17

~

Question 18

What four major elements are required for a language to be object oriented?

Answer 18

Abstraction
Encapsulation
Modularity
Hierarchy

Question 19

What is an issue with abstraction?

Answer 19

It exposes the attributes of a class e.g. person.age = -56

Question 20

What is a proper way to deal with the issues of abstraction?

Answer 20

Encapsulation

Question 21

Why is modularity used in object oriented programming?

Answer 21

The OOP approach is to break down complex programs into more manageable sub-problems (reusability)

Question 22

What are the attributes of modularity?

Answer 22

Simplicity
Independence
Narrow Interface
Balance of concerns
Reuse