**ConcurrentHashMap:** forEach, forEachKey, forEachValue, forEachEntry. Parallelism threshold (e.g., 2) = min elements for parallel execution. Don't modify map during forEach.
map.forEach((k,v) -> process(k,v));
map.forEachKey(2, k -> process(k));
map.forEachEntry(2, e -> process(e.getKey(), e.getValue()));
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like JP Morgan. The answer also includes follow-up discussion points that interviewers commonly explore.
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