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Which design pattern is most appropriate when you want to define the skeleton of an algorithm in a base class but allow subclasses to override certain steps without changing the algorithm's structure?

easy💻 Programming Recognition Q1 of Q15

OOP & Design Patterns - Template Method Pattern - Define Skeleton, Override Steps

Which design pattern is most appropriate when you want to define the skeleton of an algorithm in a base class but allow subclasses to override certain steps without changing the algorithm's structure?

ATemplate Method Pattern

BStrategy Pattern

CObserver Pattern

DDecorator Pattern

Step-by-Step Solution

Solution:

Step 1: Identify the pattern intent
The question describes a fixed algorithm structure with customizable steps.
Step 2: Match to design patterns
Template Method Pattern defines the skeleton in a base class and lets subclasses override steps.
Final Answer:
Option A -> Option A
Quick Check:
Algorithm skeleton + subclass step overrides = Template Method [OK]

Quick Trick: Fixed algorithm skeleton with customizable steps? Template Method [OK]

Common Mistakes:

MISTAKES

Confusing Strategy Pattern which encapsulates algorithms separately
Choosing Observer Pattern which is about event notification
Selecting Decorator Pattern which adds responsibilities dynamically

Trap Explanation:

PITFALL

Strategy Pattern looks similar but it encapsulates interchangeable algorithms, not fixed skeletons.

Interviewer Note:

CONTEXT

Tests understanding of when to use Template Method Pattern.

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