What is the difference between HashMap and Hashtable?
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What is the difference between HashMap and Hashtable?
HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow nulls.
Which one is better for multi-threaded applications?
Hashtable is better for multi-threaded applications due to its synchronized nature, but it can be slower.
Can you give an example of when to use each?
Use HashMap for single-threaded applications or when performance is critical. Use Hashtable for thread-safe operations.
Are there any performance differences?
Yes, HashMap generally performs better than Hashtable because it is not synchronized.
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