Quick Answer
Atomic classes (AtomicInteger, AtomicLong, AtomicBoolean, AtomicReference) provide lock-free thread-safe operations using CPU-level CAS (Compare-And-Swap). compareAndSet(expected, newValue) atomically updates only if current value matches expected - retries on failure. Faster than synchronized for simple counter/flag scenarios because no thread blocking. Used for high-performance counters and accumulators.
Answer
Provide lock-free thread-safe operations. Examples: AtomicInteger, AtomicBoolean, AtomicReference. Faster than synchronized blocks for single-variable operations.
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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.
