Difference Between Hashmap And Hashtable In Java
distinguishing between HashMap and Hashtable in Java
Difference Between Hashmap And Hashtable In Java
In Java, a HashMap is a non-synchronized data structure that allows null values and keys, while a Hashtable is a synchronized data structure that does not permit null keys or values. HashMap is generally preferred for better performance in non-thread-safe scenarios, while Hashtable is used in situations where thread safety is required. Additionally, HashMap allows for more flexibility in terms of operations and allows for the use of iterators, whereas Hashtable uses enumeration for iteration and doesn't offer the same level of flexibility.
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1 - HashMap and Hashtable are both classes in Java that implement the Map interface, allowing you to store key value pairs.
2) One key difference between them is that HashMap is not synchronized, meaning it is not thread safe, while Hashtable is synchronized, making it thread safe.
3) Because HashMap is not synchronized, it is generally more efficient in terms of performance compared to Hashtable.
4) HashMap allows for a single null key and multiple null values, while Hashtable does not allow null keys or values.
5) The iterator in HashMap is fail fast, meaning it throws a ConcurrentModificationException if the map is structurally modified while iterating. In contrast, the enumerator in Hashtable is not fail fast.
6) HashMap was introduced in Java 1.2 as part of the Java Collections Framework, while Hashtable has been in Java since the early versions.
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