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What is the main purpose of the Null Object pattern in system design?

easy🧠 Conceptual Q11 of 15
LLD - Behavioral Design Patterns — Part 2
What is the main purpose of the Null Object pattern in system design?
ATo encrypt sensitive data before storage
BTo create multiple instances of an object for load balancing
CTo optimize database queries by caching null values
DTo replace null references with an object that does nothing but follows the expected interface
Step-by-Step Solution
Solution:

  1. Step 1: Understand the problem with null references

    Null references can cause errors like null pointer exceptions when methods are called on them.

  2. Step 2: Explain how Null Object pattern solves this

    The pattern replaces null with a harmless object that implements the same interface but performs no action, avoiding errors.

  3. Final Answer:

    To replace null references with an object that does nothing but follows the expected interface -> Option D

  4. Quick Check:

    Null Object pattern = harmless object instead of null [OK]
Quick Trick: Null Object means safe empty object, not null itself [OK]
Common Mistakes:
MISTAKES
  • Confusing Null Object with caching or encryption
  • Thinking it creates multiple instances for load balancing
  • Assuming it optimizes database queries

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