Quick Answer
Thread safety and performance best practices: prefer immutability (zero synchronization cost), use concurrent collections instead of synchronized wrappers, minimize lock scope (only lock around the actual shared state, not expensive operations), avoid nested locks (deadlock risk), use lock-free atomics for counters/flags, profile to find actual bottlenecks before optimizing, and use VirtualThreads (Java 21) for I/O-bound tasks.
Answer
Prefer immutability and stateless logic. Minimize synchronized sections. Use atomic types and concurrent collections. Load-test multithreaded code thoroughly.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
