In designing a parking lot system using OOP, which design pattern best encapsulates the creation of different types of parking spots (e.g., compact, large, handicapped) to allow easy extension without modifying existing code?

easy🔍 Pattern Recognition Q1 of Q15

OOP & Design Patterns - Design a Parking Lot - LLD with OOP (Classes, Patterns, Extensibility)

ASingleton pattern to ensure only one instance of each parking spot type exists

BObserver pattern to notify spots when a vehicle arrives

CFactory pattern to create parking spot objects based on type at runtime

DDecorator pattern to add features to parking spots dynamically

Step-by-Step Solution

Solution:

Step 1: Identify the need for object creation flexibility
The system must create different parking spot types without changing existing code, which calls for a creational pattern.
Step 2: Evaluate each pattern's purpose
Singleton restricts instances but doesn't help with multiple spot types; Observer is for event notification, not creation; Decorator adds behavior dynamically but doesn't create new types.
Step 3: Recognize Factory pattern's role
Factory pattern encapsulates object creation logic and allows easy extension by adding new spot types without modifying client code.
Final Answer:
Option C -> Option C
Quick Check:
Factory pattern is the standard for flexible object creation [OK]

Quick Trick: Factory pattern creates objects flexibly [OK]

Common Mistakes:

MISTAKES

Confusing Singleton with Factory for object creation
Thinking Observer manages object creation
Assuming Decorator creates new object types

Trap Explanation:

PITFALL

Candidates often pick Singleton thinking it controls instance creation, but it limits instances rather than types.

Interviewer Note:

CONTEXT

Tests understanding of creational patterns and extensibility in OOP design.

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More OOP & Design Patterns Quizzes

In designing a parking lot system using OOP, which design pattern best encapsulates the creation of different types of parking spots (e.g., compact, large, handicapped) to allow easy extension without modifying existing code?

Step 1: Identify the need for object creation flexibility

Step 2: Evaluate each pattern's purpose

Step 3: Recognize Factory pattern's role

Final Answer:

Quick Check:

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