java.util.Hashtable methods are synchronized, java.util.Hashmap methods are not thread-safe.
If you use Hashtable there will be a performance hit as no two threads will be able to access its methods at the same time.
If you care about Thread safety in your app Hashtable is the way to go.
If you dont care about thread safety Hashmap is the way to go as it is more efficient than hashtable.
Also, java.util.Hashtable doesn't allow any null keys, where as java.util.HashMap allows one null key.
Hashmap vs Hashtable
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