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Which of the following problems CANNOT be effectively solved using the Singleton Pattern with thread safety and lazy initialization?

easy🔍 Pattern Recognition Q2 of Q15
OOP & Design Patterns - Singleton Pattern - Thread Safety, Double-Checked Locking & Lazy Init
Which of the following problems CANNOT be effectively solved using the Singleton Pattern with thread safety and lazy initialization?
AGuaranteeing a single logger instance accessible globally
BProviding a global configuration manager with lazy loading
CEnsuring a single database connection instance across threads
DLimiting the number of instances to a fixed maximum greater than one
Step-by-Step Solution
Solution:

  1. Step 1: Analyze each problem's suitability for Singleton

    Singleton enforces exactly one instance; limiting to multiple fixed instances is not Singleton.

  2. Step 2: Identify which problem cannot be solved by Singleton

    Limiting instances to a fixed number >1 requires Multiton or other patterns, not Singleton.

  3. Final Answer:

    Option D -> Option D

  4. Quick Check:

    Only option limiting multiple instances >1 is not solvable by Singleton [OK]
Quick Trick: Singleton allows only one instance, not multiple fixed instances [OK]
Common Mistakes:
MISTAKES
  • Assuming Singleton can limit multiple instances
Trap Explanation:
PITFALL
  • Candidates often think Singleton can limit instances to any fixed number, but it only allows one.
Interviewer Note:
CONTEXT
  • Tests anti-pattern recognition and understanding Singleton limitations
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