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Java 7 vs Java 8+ ConcurrentHashMap?
Tests whether you know Java 7's ConcurrentHashMap used segment-level locking (a fixed array of locks, each guarding a slice of the table), while Java 8 moved to per-bucket synchronization combined with CAS operations on individual bins -- finer-grained locking that improves concurrency, plus the same bucket-treeification HashMap gained.
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