Basic Structural Modeling

Questions and Answers

What is a class?

A class is a description of a set of objects that share the same attributes, operations, relationships, and semantics.

What is a simple name in the context of a class?

A name that distinguishes a class from other classes.

What is an attribute in relation to a class?

A named property of a class that describes a range of values that instances may hold.

What is the purpose of an operation in a class?

To define a service or action that can be requested from any object of the class. Signup and view all the answers

Which of the following represents a responsibility of a class?

Maintaining state and behavior Signup and view all the answers

What does it mean to elide a class?

To show only some or none of a class's attributes and operations. Signup and view all the answers

What is the significance of a qualified name?

It is the class name prefixed by the name of the package in which the class lives. Signup and view all the answers

A class can have no attributes or operations at all.

True Signup and view all the answers

A __________ is a named property of a class that describes a range of values.

attribute Signup and view all the answers

Match the following types with their correct definitions:

Class = A description of a set of objects Attribute = A named property of a class Operation = A service requested from an object Responsibility = An obligation of a class to perform tasks Signup and view all the answers

Study Notes

Basic Structural Modeling

Classes

A class is a set of objects sharing attributes, operations, relationships, and semantics.
Graphical representation of a class is a rectangle.
Each class has a name, which is either a simple name (just the class name) or a qualified name (class name plus package name).

Attributes

Attributes represent properties of a class, defining possible values instances can hold.
A class can have many or few attributes; attributes describe shared characteristics (e.g., height, width for a Wall class).

Operations

Operations are services that can be invoked on class objects, representing behaviors that affect object state.
Example operations in a Rectangle class include moving, resizing, or querying its properties.
Operations are depicted below attributes graphically and include signatures (name, type, default values, return type).

Organizing Attributes and Operations

Not every attribute and operation needs to be depicted in a class diagram; only relevant ones should be displayed.
Use ellipses ("...") to indicate more attributes or operations exist than shown.

Responsibilities

Each class has responsibilities representing its obligations toward maintaining state and behavior.
Examples: Wall class manages dimensions; FraudAgent class processes and evaluates orders; TemperatureSensor class monitors temperature levels and triggers alarms.

Common Modeling Techniques

Modeling System Vocabulary

Classes are used to model abstractions relevant to solving a specific problem or therapeutic solution.
Identify key terms critical to users or implementers through methods like CRC cards and use case analysis.
Ensure each class has clearly defined roles and responsibilities.
Example classes could include Customer, Order, Product, Shipment, Invoice, and Transaction.

Distribution of Responsibilities

As the number of classes increases, it's vital to ensure responsibilities are balanced among them, allowing for manageable and logical structuring of the system's vocabulary.

Description

Explore the fundamental concepts of basic structural modeling in this quiz. Topics include classes, relationships, common mechanisms, and diagrams. Test your understanding of these key elements and their significance in system design.