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UML Class Diagrams Explained

📑 5 slides 👁 33 views 📅 5/1/2026
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Introduction to UML Class Diagrams

UML class diagrams show system structure through classes, attributes, methods, and relationships.

Introduction to UML Class Diagrams
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Class Notation Basics

  • Classes are represented as boxes with three compartments: name, attributes, and methods.
  • Visibility notations (+ public, - private, # protected, ~ package) define access levels.
  • Attributes and methods include data types and visibility for clarity.
Class Notation Basics
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Parameter Directionality

  • Parameters can be In (input), Out (output), or InOut (input and output).
  • Directionality indicates data flow between objects during method calls.
  • Crucial for understanding how methods interact with class attributes.
Parameter Directionality
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Class Relationships

  • Common relationships: Association, Aggregation, Composition, and Inheritance.
  • Aggregation (whole-part) and Composition (stronger whole-part) differ in dependency.
  • Inheritance shows 'is-a' relationships, while Realization indicates interface implementation.
Class Relationships
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Benefits & Applications

  • Class diagrams provide a clear visual of system architecture and OOP concepts.
  • They enable faster design, analysis, and code generation in development tools.
  • Essential for communication between technical and non-technical stakeholders.
Benefits & Applications
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