[Solved] Consider two approaches to implementing payment processing: 1. Using conditional statements inside a single class. 2.... When is approach 2 clearly better than approach 1? | OOP & Design Patterns

OOP & Design Patterns - Strategy Pattern - Replace Conditionals with Polymorphism

Consider two approaches to implementing payment processing: 1. Using conditional statements inside a single class. 2. Using the Strategy Pattern with dependency injection. When is approach 2 clearly better than approach 1?

AWhen performance is critical and conditionals are faster

BWhen the number of payment methods is fixed and never changes

CWhen new payment methods need to be added frequently without modifying existing code

DWhen the system must minimize memory usage

Step-by-Step Solution

Solution:

Step 1: Compare maintainability of approaches
Conditional approach requires modifying existing code to add new methods, violating the open-closed principle.
Step 2: Identify Strategy Pattern advantage
Strategy Pattern allows adding new behaviors by creating new classes without changing existing code.
Final Answer:
Option C -> Option C
Quick Check:
Strategy improves extensibility for frequent additions [OK]

Quick Trick: Strategy excels when behaviors change often [OK]

Common Mistakes:

MISTAKES

Picking performance over maintainability
Ignoring open-closed principle

Trap Explanation:

PITFALL

Candidates confuse performance with maintainability trade-offs.

Interviewer Note:

CONTEXT

Tests understanding of design trade-offs between approaches.

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Solution Trace

More OOP & Design Patterns Quizzes

When is approach 2 clearly better than approach 1?

Step 1: Compare maintainability of approaches

Step 2: Identify Strategy Pattern advantage

Final Answer:

Quick Check:

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