Difference between Collections.synchronizedMap(Map) and ConcurrentHashMap.

Both maps are thread-safe implementations of the Map interface.

ConcurrentHashMap allows concurrent modification of the Map from several threads without the need to block them while synchronizedMap creates a blocking Map which will degrade performance.

synchronizedMap ensures data consistency and enables every thread to have an up-to-date view of the map.

ConcurrentHashMap is preferred where performance is critical and each thread only inserts data to the map, with reads happening less frequently while use synchronizedMap for data consistency across threads.

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