Answer
Thread-safe optimized collections.
Examples: ConcurrentHashMap, CopyOnWriteArrayList.
Avoids manual synchronization.
Examples: ConcurrentHashMap, CopyOnWriteArrayList.
Avoids manual synchronization.
Quick Answer
java.util.concurrent provides thread-safe collections: ConcurrentHashMap (segmented locking, much better than synchronized HashMap), CopyOnWriteArrayList (thread-safe for read-heavy scenarios, writes copy the entire array), BlockingQueue (LinkedBlockingQueue, ArrayBlockingQueue - blocks producer/consumer when full/empty), ConcurrentLinkedQueue (lock-free). Choose based on read/write ratio and blocking needs.
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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.
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Source: SugharaIQ