[Solved] Which of the following is the correct way to implement a Null Object in a class hierarchy? - Ans: Create a subclass that overrides methods with empty implementations | LLD

LLD - Behavioral Design Patterns — Part 2

Which of the following is the correct way to implement a Null Object in a class hierarchy?

ACreate a subclass that overrides methods with empty implementations

BUse a global variable set to null

CThrow exceptions in the Null Object methods

DReturn null from all methods in the Null Object

Step-by-Step Solution

Solution:

Step 1: Identify how Null Object should behave
It should implement the same interface but provide harmless (empty) behavior.
Step 2: Choose the correct implementation approach
Creating a subclass that overrides methods with empty implementations fits the pattern.
Final Answer:
Create a subclass that overrides methods with empty implementations -> Option A
Quick Check:
Null Object subclass overrides methods safely [OK]

Quick Trick: Null Object overrides methods with empty bodies [OK]

Common Mistakes:

MISTAKES

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Which of the following is the correct way to implement a Null Object in a class hierarchy?