System Overview - UML class diagrams basics
A UML class diagram visually shows the structure of a system by displaying classes, their attributes, methods, and relationships. It helps understand how different parts of a system connect and interact.
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UML class diagrams basics in LLD - Architecture Diagram
Architecture Diagram
+----------------+ +----------------+ +----------------+
| Class A | | Class B | | Class C |
|----------------| |----------------| |----------------|
| - attribute1 | | - attribute2 | | - attribute3 |
| + method1() | | + method2() | | + method3() |
+----------------+ +----------------+ +----------------+
| | |
| association | inheritance | aggregation
|------------------------|------------------------|
v v v
+----------------+ +----------------+ +----------------+
| Class D | | Class E | | Class F |
+----------------+ +----------------+ +----------------+Components
Class A
class
Represents an entity with attributes and methods
Class B
class
Represents another entity with its own attributes and methods
Class C
class
Represents a class that aggregates other classes
Class D
class
Associated class connected to Class A
Class E
class
Inherits from Class B
Class F
class
Aggregated by Class C
Request Flow - 4 Hops
User → Class A
Class A → Class D
Class B → Class E
Class C → Class F
Failure Scenario
Component Fails:Class B
Impact:Inheritance relationship to Class E is unclear or missing, causing confusion about Class E's behavior
Mitigation:Update the diagram to restore or clarify inheritance links; use notes or comments to explain missing parts
Architecture Quiz - 3 Questions
Test your understanding
Which relationship shows that one class inherits properties from another?
Design Principle
UML class diagrams use clear visual symbols to represent different relationships like inheritance, association, and aggregation, helping to understand system structure and class interactions easily.