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What is the main purpose of the Template Method pattern in system design?

easy🧠 Conceptual Q11 of Q15
LLD - Behavioral Design Patterns — Part 1
What is the main purpose of the Template Method pattern in system design?
ATo replace all methods with completely new implementations
BTo define a fixed sequence of steps with some customizable parts
CTo allow direct modification of the entire process by subclasses
DTo create multiple unrelated classes with no shared behavior
Step-by-Step Solution
Solution:

  1. Step 1: Understand the Template Method pattern goal

    The pattern fixes the overall process flow but allows subclasses to customize certain steps.

  2. Step 2: Analyze each option

    To define a fixed sequence of steps with some customizable parts correctly describes this fixed sequence with customizable parts. Options A, B, and C do not match the pattern's intent.

  3. Final Answer:

    To define a fixed sequence of steps with some customizable parts -> Option B

  4. Quick Check:

    Template Method = fixed process + flexible steps [OK]
Quick Trick: Remember: fixed order, flexible details [OK]
Common Mistakes:
MISTAKES
  • Thinking subclasses rewrite the whole process
  • Confusing Template Method with Strategy pattern
  • Believing the pattern removes all common code
  • Assuming no steps are customizable

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