UML Class and Objects Quiz

Explain the basic components of a UML class diagram.

• Functions, variables, inheritance, and encapsulation

• Variables, methods, inheritance, and interfaces

• Classes, attributes, operations, and relationships

• Objects, properties, inheritance, and polymorphism

What is the purpose of object-oriented modeling?

• To represent abstract concepts in a software system

• To create a visual representation of data flow in a software system

• To organize files and folders in a software system

• To represent real-world objects and their interactions in a software system.

Differentiate between association and aggregation in UML.

• Association represents a relationship between two classes, while aggregation represents a whole-part relationship.

• Association and aggregation are the same thing in UML.

• Association represents a whole-part relationship, while aggregation represents a relationship between two classes.

• Association is used for inheritance, while aggregation is used for encapsulation.

Explain the concept of UML class relationships with an example.

• Dependency is a type of UML class relationship where one class uses another class. For example, a 'Driver' class uses a 'Car' class to drive.

• Inheritance is a type of UML class relationship where one class inherits the properties and behaviors of another class. For example, a 'Car' class can inherit from a 'Vehicle' class, as a car is a type of vehicle.

• Aggregation is a type of UML class relationship where one class is composed of other classes. For example, a 'University' class is composed of 'Student' and 'Professor' classes.

• Association is a type of UML class relationship where one class is a part of another class. For example, a 'Wheel' class is a part of a 'Car' class.

What is the notation used to represent an object in UML?

• Entity diagram

• Instance graph

• Object chart

• Class diagram

Describe the attributes and methods of a UML class.

• The attributes and methods of a UML class include the color and size of the class

• The attributes and methods of a UML class include the weight and height of the class

• The attributes and methods of a UML class include the data members and functions or operations that the class can perform.

• The attributes and methods of a UML class include the brand and model of the class

What are the key elements of object-oriented modeling?

• Classes, objects, inheritance, polymorphism, and encapsulation

• Algebra, geometry, calculus, statistics

• Variables, loops, functions, arrays

• HTML, CSS, JavaScript, SQL

How is association different from aggregation in UML?

• Association represents a relationship between two classes, while aggregation represents a part-whole relationship where the part can exist independently of the whole.

• Association and aggregation are the same in UML

• Association represents a part-whole relationship, while aggregation represents a relationship between two classes

• Association is used for inheritance, while aggregation is used for composition