HashMap vs. Hashtable in Java: Which is Faster for Single-Threaded Applications?

Differences Between HashMap and Hashtable in Java: Which is More Efficient for Non-Threaded Applications?

When utilizing data structures in Java, HashMap and Hashtable stand out as popular choices. However, there are key differences between these two implementations that impact their suitability for various situations.

Key Differences:

• Synchronization: Hashtable is synchronized, while HashMap is not. Synchronization ensures thread-safe access, preventing multiple threads from modifying the same data concurrently.
• Null Handling: Hashtable does not permit null keys or values. HashMap, on the other hand, allows a single null key and multiple null values.
• Iteration Order: HashMap follows the natural insertion order, while Hashtable does not guarantee any specific iteration order.

Efficiency for Non-Threaded Applications:

In non-threaded applications where synchronization is not a concern, HashMap outperforms Hashtable. Unsynchronized objects, like HashMap, typically exhibit better performance compared to synchronized ones. Therefore, HashMap is the more efficient choice for non-threaded scenarios.

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