UML Class Diagrams: Key Concepts

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Questions and Answers

Which element is NOT a typical primary component of a UML class diagram?

  • Operations
  • Use cases (correct)
  • Classes
  • Attributes

In a class diagram, what relationship does a solid line with a hollow arrowhead typically represent?

  • Dependency
  • Aggregation
  • Inheritance (Generalization) (correct)
  • Association

What type of relationship signifies a 'part-of' connection where the 'part' can outlive the 'whole'?

  • Composition
  • Aggregation (correct)
  • Generalization
  • Dependency

Which symbol in a class diagram indicates that an attribute or operation has private visibility?

<p><code>-\</code> (A)</p> Signup and view all the answers

What does the multiplicity notation 0..* on an association line indicate in a class diagram?

<p>Zero or many instances (D)</p> Signup and view all the answers

Which UML diagram is used to primarily depict the static structure of a system, including classes and their relationships?

<p>Class diagram (B)</p> Signup and view all the answers

What type of relationship represents a strong 'part-of' relationship where the 'part' is destroyed if the 'whole' is destroyed?

<p>Composition (C)</p> Signup and view all the answers

Within the context of class diagrams, what are 'operations'?

<p>Behaviours or functions that a class can perform (A)</p> Signup and view all the answers

Which graphical representation signifies a dependency relationship between two classes in a UML class diagram?

<p>A dashed line with an open arrowhead (A)</p> Signup and view all the answers

When identifying potential classes and attributes for a class diagram, which analysis technique focuses on identifying nouns found within the requirements documentation?

<p>Noun/Verb Analysis (D)</p> Signup and view all the answers

Flashcards

Class Diagram

A visual representation of a system's static structure, showcasing classes, attributes, operations, and relationships.

Attributes

Characteristics or properties that define the data held by a class.

Operations

Actions or functions that a class can perform, defining its behavior.

Dependency

A relationship where one class uses or depends on another.

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Aggregation

A weaker 'part-of' relationship where the part can exist independently of the whole.

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Composition

A stronger 'part-of' relationship where the part cannot exist independently and is destroyed with the whole.

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Inheritance (Generalization)

A hierarchical relationship where one class (subclass) inherits from another (superclass).

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Multiplicity

Specifies how many instances of one class relate to another (e.g., one-to-many).

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Noun/Verb Analysis

Determining classes and attributes by identifying the nouns in requirements documentation.

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Visibility

Controls the visibility of attributes and operations, determining where they can be accessed (+ public, - private, # protected).

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Study Notes

  • UML class diagrams primarily represent classes, attributes, and operations; use cases are not a primary element.
  • A solid line with a hollow arrowhead in a class diagram represents inheritance (generalization).
  • Aggregation indicates a "part-of" relationship where the part can exist independently of the whole.
  • A minus sign (-) denotes private visibility for an attribute or operation.
  • In multiplicity notation, 0..* signifies zero or many instances.
  • A class diagram illustrates the static structure of a system, including classes and their relationships.
  • Composition represents a strong "part-of" relationship where the part cannot exist independently of the whole and is destroyed if the whole is destroyed.
  • Operations are behaviors or functions that a class can perform.
  • A dashed line with an open arrowhead represents a dependency relationship between two classes.
  • Noun/Verb Analysis focuses on the nouns found in requirements documentation to identify potential classes and attributes.

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