Beyontec Interview Questions and Answers

HashMap is not synchronized and allows null values, while Hashtable is synchronized and does not allow null values.

• HashMap is faster and preferred for non-thread-safe operations.

• Hashtable is slower but thread-safe.

• HashMap allows null values, while Hashtable does not.

• HashMap is not synchronized, so it is not suitable for concurrent operations.

• Hashtable is synchronized, making it suitable for concurrent operations.

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