[Solved] In designing a parking lot system using OOP, which component is best suited to decide which type of parking spot (e.g., compact, large, handicapped) should be allocated to an incoming vehicle? | OOP & Design Patterns

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

In designing a parking lot system using OOP, which component is best suited to decide which type of parking spot (e.g., compact, large, handicapped) should be allocated to an incoming vehicle?

AThe ParkingLot class, as it manages all spots and vehicles

BThe ParkingSpot class, since it represents the spot's characteristics

CThe Vehicle class, because it knows its own size and type

DA Factory or Strategy pattern component that encapsulates the allocation logic

Step-by-Step Solution

Step 1: Understand responsibilities
The Vehicle class only knows about itself, not allocation rules. The ParkingSpot class represents a spot but doesn't decide allocation. The ParkingLot manages overall state but delegating allocation logic to a dedicated component improves modularity.
Step 2: Recognize design pattern role
The Factory or Strategy pattern encapsulates allocation logic, allowing easy extension and modification without changing core classes.
Final Answer:
Option D -> Option D
Quick Check:
Allocation logic centralized -> easier to maintain and extend [OK]

Quick Trick: Allocation logic belongs in a dedicated pattern component, not core entities [OK]

Common Mistakes:

MISTAKES

Assigning allocation responsibility to Vehicle or ParkingSpot classes
Putting all logic inside ParkingLot class leading to tight coupling

Trap Explanation:

PITFALL

Options A and B seem plausible because they relate to vehicle and spot attributes, but they violate single responsibility and reduce extensibility. Option D is tempting but leads to monolithic design.

Interviewer Note:

CONTEXT

Tests candidate's understanding of responsibility assignment and design pattern application in OOP LLD

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Solution Trace

More OOP & Design Patterns Quizzes

In designing a parking lot system using OOP, which component is best suited to decide which type of parking spot (e.g., compact, large, handicapped) should be allocated to an incoming vehicle?

Step 1: Understand responsibilities

Step 2: Recognize design pattern role

Final Answer:

Quick Check:

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