Unified Modeling Language (UML)

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What is Unified Modeling Language (UML)?

Unified Modeling Language (UML) is the universal language of software architecture—a visual toolkit that helps developers, designers, and stakeholders understand, build, and communicate complex systems with clarity and precision. Whether you’re designing a new app or documenting an existing system, UML diagrams make your ideas accessible and your designs professional.

UML - An Overview

Before we begin to look at the theory of the UML, we are going to take a very brief run through some of the major concepts of the UML.

The first thing to notice about the UML is that there are a lot of different diagrams (models) to get used to. The reason for this is that it is possible to look at a system from many different viewpoints. A software development will have many stakeholders playing a part.

For Example:

  • Analysts
  • Designers
  • Coders
  • Testers
  • QA
  • The Customer
  • Technical Authors

Types of UML Diagrams

Fig1. UML Diagram


Class Diagram: The Blueprint of Your System

A class diagram is the backbone of object-oriented design. It gives a static view of your system by showcasing its classes, attributes, methods, and the relationships among them.

 Key Elements of a Class Diagram

·    ·       Class: Represented as a rectangle divided into three compartments:

o   Name (top): The unique identifier of the class (e.g., Team).

o   Attributes (middle): Data fields or properties (e.g., name, city, division).

o   Methods/Operations (bottom): Actions or behaviors (e.g., playGame(), hireCoach())

 ·       Visibility Markers:

o   + Public: Accessible from any class.

o   - Private: Accessible only within the same class.

o   # Protected: Accessible within the class and its subclasses.

o   ~ Package: Accessible within the same package

Fig2. Simple Class Diagram

 ·       Relationships: Lines and arrows connect classes, showing associations like inheritance, aggregation, and composition.







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