Web Reference: Jul 23, 2025 · HashMap allows one null key and multiple null values whereas Hashtable doesn't allow any null key or value. HashMap is generally preferred over HashTable if thread synchronization is not needed. Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones. Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values. Understanding the differences between HashMap and HashTable is crucial for any Java developer. While both serve the purpose of storing key-value pairs, their characteristics make them suitable for different scenarios.
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