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. Compare and contrast HashMap and Hashtable in Java based on synchronization, null keys and values, and iteration order. See answers from experts and users with examples and references. 5 days ago · Learn the key differences between HashMap and Hashtable classes in Java, such as synchronization, null keys and values, performance, and iteration. See examples, diagrams, and related topics.
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