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. One of the major differences between HashMap and Hashtable is that HashMap is non-synchronized whereas Hashtable is synchronized, which means Hashtable is thread-safe and can be shared between multiple threads but HashMap cannot be shared between multiple threads without proper synchronization. 5 days ago · HashMap and Hashtable are used to store key-value pairs in Java, but they differ in terms of synchronization, performance, and usage scenarios. In this chapter, you will learn about the differences between HashMap and Hashtable, including their features, performance, and when to use each in Java.
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