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Compare the Lazy Initialization with Synchronized Method approach and the Double-Checked Locking approach for Singleton. When is the synchronized method approach preferable?

hard⚖️ Approach Comparison Q8 of Q15

OOP & Design Patterns - Singleton Pattern - Thread Safety, Double-Checked Locking & Lazy Init

Compare the Lazy Initialization with Synchronized Method approach and the Double-Checked Locking approach for Singleton. When is the synchronized method approach preferable?

AWhen instance creation is expensive and performance critical

BWhen multiple instances are allowed

CWhen simplicity and correctness are prioritized over performance

DWhen eager initialization is required

Step-by-Step Solution

Solution:

Step 1: Analyze synchronized method approach
Synchronized method is simpler but locks every call, impacting performance.
Step 2: Identify when simplicity is preferred
Use synchronized method when code simplicity and correctness are more important than performance.
Final Answer:
Option C -> Option C
Quick Check:
Synchronized method is simpler but slower; preferred for correctness over speed [OK]

Quick Trick: Synchronized method is simpler but slower than double-checked locking [OK]

Common Mistakes:

MISTAKES

Assuming synchronized method is always better performance-wise

Trap Explanation:

PITFALL

Candidates confuse performance trade-offs and simplicity trade-offs between approaches.

Interviewer Note:

CONTEXT

Tests trade-off reasoning between two Singleton implementations

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