Class Diagrams

What does a class describe?

• The attributes of a single object

• A set of objects with similar characteristics

• An object itself

• The behavior of a single object

What is an instance of a class?

• A specific object created from a class

• A blueprint for creating objects

• A relationship between two classes

• A method within a class

Which of the following is NOT a principle of Object-Oriented Programming?

• Abstraction

• Compilation

• Encapsulation

• Inheritance

What does polymorphism allow in Object-Oriented Programming?

• Objects to be created from multiple classes

• Different objects to be processed differently based on their data type

• Classes to inherit from multiple parent classes

• Objects to hide their internal implementation

What does encapsulation mean?

• Creating multiple instances of a class

• Defining relationships between classes

• Hiding the details of class implementation

• Binding data with the code that manipulates it

What is the purpose of a class diagram?

• To represent the structure of classes and their relationships

• To show the sequence of operations

• To define the behavior of individual objects

• To capture user requirements

What does aggregation in UML represent?

• A strong form of association

• A relationship where one class contains another

• A type of inheritance

• A relationship where classes are loosely connected

What does composition imply in UML?

• Objects are loosely associated

• Objects can exist independently

• Objects can be part of multiple classes

• The life and death of associated objects coincide

What is the first compartment of a class notation?

• Attributes

• Class name

• Methods

• Relationships

What does multiplicity indicate in a class diagram?

• The number of methods in a class

• The number of objects involved in an association

• The number of attributes in a class

• The number of classes in a system