Differences between a HashMap and a Hashtable in Java?
Explanation
There are many differences between a HashMap and a Hashtable in Java. Some are as follows:
| Hashmap | Hashtable |
| Hashmap is not synchronized. | Hashtable is synchronized. |
| Hashmap allows for one null key number. And also any number of null values. | Hashtable does not allow for any null keys or values. |
- As hashtable is synchronized it will make hashmap better for non-threaded applications. As synchronization Objects will not perform better than unsynchronization ones.
- There is one subclass of HashMap and that is
LinkedHashMap.you could easily swap out the hashmap for aLinkedHashMap. This wouldn’t be as easy if you were using hashtable
Also read, what is a minimum number of keys that can store in the B-tree?