UML = blueprint for software. Two types:

Class Diagram

  1. Identify domain classes (User, Expense, Category)
  2. Add attributes/methods
  3. Draw relationships with multiplicity (1..*, 0..1)

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<<Interface>> | Abstract class | Object

🔗 Types of Relationships in UML Class Diagrams

Relationship Lines Meaning
Association —— connection between two classes (1: M), (M: N) E.g., User has Profile.
Inheritance — >
Realization - - - >
Dependency - - - > uses-a relation. Provided by method params
Aggregation Team ◇--- Player has-a relationship.
Composition House ◆--- Room Stronger form of aggregation. : Rooms don’t exist alone.

Assocation types