Based on my previous posts related to Hashtable and HashMap let’s see the difference.
| HashMap | Hashtable |
|---|---|
| Non-Synchronized. Fast. | Synchronized. Slow |
| Allows one null key and any number of null values. | Hashtable doesn’t allow null keys and null values. |
| Use LinkedHashMap to maintains the insertion order.
TreeMap to sort mappings based on the ascending order of keys. |
Hashtable doesn’t guarantee any kind of order. |
| Iterator in HashMap is fail-fast. | Enumerator in Hashtable is not fail-fast. |
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