Following are some difference as :
HashMap | HashTable |
1 Hashmap is not synchronized in nature . |
1 Hashtable is synchronised. |
2 iterator in the HashMap is fail-safe . Fail-safe - “if the Hashtable is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove method, the iterator will throw a ConcurrentModificationException” |
2 while for the Hashtable is not. |
3 HashMap permits null values and only one null key. |
3 while Hashtable doesn't allow key or value as null. |
4 HashMap use iterator. |
4 Hashtable use enumeration. |
5 HashMap is faster. | 5 Hashtable is slower. |
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