Inheritance and interface notation in LLD - Architecture Diagram

System Overview - Inheritance and interface notation

This system models how inheritance and interfaces work in object-oriented design. It shows how classes inherit properties and methods from parent classes and how interfaces define contracts that classes must follow. The key requirement is to clearly represent the relationships between classes and interfaces.

Architecture Diagram

          +----------------+
          |   Interface A  |
          +----------------+
                  ^
                  |
          +----------------+
          |   Class B      |
          +----------------+
                  |
                  v
          +----------------+
          |   Class C      |
          +----------------+

Components

Interface A

interface

Defines a contract with method signatures that implementing classes must follow

Class B

class

Implements Interface A and provides concrete method implementations

Class C

class

Inherits from Class B and can override or extend its behavior

Request Flow - 3 Hops

Class C → Class B

Class B → Interface A

User → Class C

Failure Scenario

Component Fails:Class B

Impact:Class C cannot inherit or use methods from Class B, breaking functionality

Mitigation:Refactor Class C to implement Interface A directly or fix Class B implementation

Architecture Quiz - 3 Questions

Which component defines the method signatures that must be implemented?

A Interface A

B Class B

C Class C

D User

Design Principle

This architecture demonstrates how interfaces define contracts that classes must implement, and how inheritance allows classes to reuse and extend behavior. It separates the 'what' (interface) from the 'how' (class implementation), promoting modular and flexible design.