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8 Ιαν 2024 · Hashtable locks the entire table during a write operation, thereby preventing other reads or writes. This could be a bottleneck in a high-concurrency environment. ConcurrentHashMap, however, allows concurrent reads and limited concurrent writes, making it more scalable and often faster in practice.
Hashtable is belongs to the Collection framework; ConcurrentHashMap belongs to the Executor framework. Hashtable uses single lock for whole data. ConcurrentHashMap uses multiple locks on segment level (16 by default) instead of object level i.e. whole Map.
26 Ιουλ 2021 · The ConcurrentHashMap and SynchronizedHashMap both are the Collection classes which are thread-safe and can be used in multithreaded and concurrent java application. But there are few differences that exists between them.
Hashtable can be a bottleneck under high concurrency due to its global locking, while ConcurrentHashMap provides a more scalable approach to concurrency with better performance. When implementing multithreaded Java applications, it’s essential to understand these differences to choose the right data structure for your needs. Further Reading
31 Αυγ 2024 · In Java, both Hashtable and ConcurrentHashMap are implementations of the Map interface used to store key-value pairs. However, they differ significantly in handling synchronization and...
5 Ιαν 2024 · In summary, developers should consider the concurrency requirements of their applications and choose the appropriate class accordingly, with Hashtable for simpler scenarios and ConcurrentHashMap for improved concurrency support and performance in multi-threaded environments.
29 Ιουλ 2021 · Concurrent hash map applies locks only at bucket level called fragment while adding or updating the map. So, a concurrent hash map allows concurrent read and write operations to the map. HashTable is a thread-safe legacy class introduced in the Jdk1.1. It is a base implementation of Map interface.
