If the formatting requirements change often but the database schema remains stable, what is the expected consequence when applying the Single Responsibility Principle?

easy🧾🤔 Trace Reasoning Q3 of Q15

OOP & Design Patterns - Single Responsibility Principle - One Class, One Reason to Change

A class is responsible for both formatting user input and saving it to a database. If the formatting requirements change often but the database schema remains stable, what is the expected consequence when applying the Single Responsibility Principle?

AThe class will become more complex as responsibilities are combined.

BBoth formatting and database classes must be changed simultaneously.

CThe database schema will need frequent updates to accommodate formatting changes.

DOnly the formatting class needs modification, leaving the database class unaffected.

Step-by-Step Solution

Solution:

Step 1: Identify responsibilities
The class has two responsibilities: formatting input and saving data.
Step 2: Apply SRP
Separate these into two classes: one for formatting, one for persistence.
Step 3: Analyze impact of changes
When formatting rules change, only the formatting class requires modification; the persistence class remains stable.
Final Answer:
Option D -> Option D
Quick Check:
Separate responsibilities isolate changes [OK]

Quick Trick: Separate concerns to isolate changes [OK]

Common Mistakes:

MISTAKES

Assuming database changes with formatting updates
Believing both responsibilities must be changed together
Thinking combining responsibilities reduces complexity

Trap Explanation:

PITFALL

Option B looks plausible because both responsibilities are in one class, but SRP separates them.

Interviewer Note:

CONTEXT

Tests understanding of how SRP isolates changes to specific responsibilities.

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If the formatting requirements change often but the database schema remains stable, what is the expected consequence when applying the Single Responsibility Principle?

Step 1: Identify responsibilities

Step 2: Apply SRP

Step 3: Analyze impact of changes

Final Answer:

Quick Check:

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