LLD - Behavioral Design Patterns — Part 2
You have a Null Object implementation but still get null pointer exceptions in your system. What is the most likely cause?
You have a Null Object implementation but still get null pointer exceptions in your system. What is the most likely cause?
medium📝 Analysis Q14 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand Null Object pattern goal
It replaces null references to avoid null pointer exceptions.Step 2: Identify why exceptions still occur
If some code still uses null directly, exceptions will happen despite Null Object presence.Final Answer:
Some parts of the code still use null instead of the Null Object -> Option AQuick Check:
Null Object must replace all nulls to avoid exceptions [OK]
Quick Trick: All nulls must be replaced by Null Object [OK]
Common Mistakes:
MISTAKES- Assuming Null Object throws exceptions
- Ignoring interface implementation correctness
- Confusing caching with Null Object usage
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