HashMap vs. Hashtable:
Both HashMap and Hashtable are two implementation
class of Map interface which contains pair. In a pair, one is key and one is
value.
There are many differences between HashMap and
Hashtable.
|
HashMap Introduced in 1.2 version HashMap is not synchronized, that means it is not in thread safe. HashMap allows one null key and multiple null values. HashMap is faster. We can traverse HashMap by Iterator. |
Hashtable Introduced in 1.0 version, that’s why it is called as legacy. Hashtable is synchronized, that means it is thread safe. Hashtable not allowed any null key or value. Hashtable is slow. We can traverse Hashtable by Enumerator and Iterator. |
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