Question 1

An approach used to specify the software solution in terms of collaborating objects, their attributes and their methods is called object oriented design.

Accepted Answer

Object-oriented design is a programming approach that models a system as a group of interacting objects, each with its own attributes and methods.

Question 2

An interface class is an object class that provides the means by which an actor can interface with the system.

Accepted Answer

An interface class is a class that defines a set of methods that must be implemented by any class that implements the interface. It does not provide any implementation of the methods, only the definition of the methods.

Question 3

A dependency relationship is illustrated with a dashed arrow line.

Accepted Answer

In UML diagrams, a dependency relationship is represented by a dashed arrow line, indicating that one element depends on another.

Question 4

Navigability is illustrated with an arrowhead pointing only to the direction a message can be sent.

Accepted Answer

In UML diagrams, navigability is shown with an arrowhead indicating the direction in which a message or communication can be sent between objects or classes.

Question 5

Visibility is the level of access an external object has to an attribute or method.

Accepted Answer

Visibility in programming refers to the scope or level of access that external objects or classes have to a particular attribute or method within a class.

Question 6

Method is the software logic that is executed in response to a message.

Accepted Answer

A method is a function or procedure associated with a class or object in object-oriented programming, and it is executed when a message (or call) is sent to the object.

Question 7

In a pure object-oriented environment every piece of code exists inside an object class.

Accepted Answer

In a pure object-oriented environment, all code and data are encapsulated within objects, which are instances of classes.

Question 8

An object-oriented system is structured into at least three different types of object classes.

Accepted Answer

An object-oriented system is typically structured into at least three different types of object classes: entity classes, boundary classes, and control classes.

Question 9

Entity classes are identified during systems analysis and usually correspond to items in real life and contain information, known as attributes, that describes the different instances of the entity.

Accepted Answer

Entity classes are conceptual representations of real-world objects or concepts in a system, and they have attributes that store data about specific instances of these entities.

Question 10

Interface classes are a means through which the attributes will interface with the instances of an entity.

Accepted Answer

Interface classes define a contract with methods that must be implemented by any class that inherits from them, but they do not directly manage attributes or instances of an entity.

Question 11

The responsibility of the interface class is twofold: (1) it translates the user's input into information that the system can understand and use to process the business event; (2) it takes data pertaining to a business event and translates the data for appropriate presentation to the user.

Accepted Answer

An interface class serves as a bridge between the user and the system, converting user inputs into system-understandable data and presenting system data in a user-friendly format.

Question 12

Controller classes implement the business logic or business rules of the system.

Accepted Answer

Controller classes are responsible for handling user input, validating data, and performing business logic. They do not implement the business logic or business rules of the system.

Question 13

System classes handle operating system-specific functionality.

Accepted Answer

System classes in programming languages like Java provide methods and fields that allow interaction with the underlying operating system, such as accessing environment variables, system properties, and performing input/output operations.

Question 14

By employing persistence classes, it allows the entity classes to be more implementation neutral and potentially more reusable.

Accepted Answer

Persistence classes abstract the database operations, allowing entity classes to focus on business logic, making them more implementation-neutral and reusable across different contexts.

Question 15

By employing persistence classes, it allows the entity classes to be more implementation specific and potentially more usable.

Accepted Answer

Persistence classes are used to separate the persistence logic from the entity classes, making the entity classes less implementation-specific and more reusable across different contexts.

Question 16

Persistence classes read and write to a database.

Accepted Answer

Persistence classes are designed to handle the storage and retrieval of data from a database, managing the interaction between the application and the database.

Question 17

Public attributes can be accessed and public methods can be invoked by any other method in any other class.

Accepted Answer

Public attributes and methods are accessible from any other class, as they have no access restrictions.

Question 18

Private attributes can be accessed and private methods can be invoked only by any method in the class in which the attribute or method is defined.

Accepted Answer

Private attributes and methods in a class are intended to be accessed only within the class itself, ensuring encapsulation and restricting access from outside the class.

Question 19

A class responsibility is essentially the same thing as a class method.

Accepted Answer

The answer of A class responsibility is essentially the same...

Question 20

A class responsibility is implemented by the creation of one or more methods that may have to collaborate with other classes and methods.

Accepted Answer

A class responsibility is typically fulfilled by implementing methods that may need to interact with other classes and methods to perform the required tasks.

Quiz 18: Object-Oriented Design and Modeling Using the UML