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There are several differences between HashMap and Hashtable in Java: Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones. Hashtable does not allow null keys or values.
26 Σεπ 2008 · A hashtable, on the other hand, has an associated function that takes an entry, and reduces it to a number, a hash-key. This number is then used as an index into the array, and this is where you store the entry. A hashtable revolves around an array, which initially starts out empty.
23 Ιαν 2022 · The Hashtable class implements a hash table, which maps keys to values. Any non-null object can be used as a key or as a value. To successfully store and retrieve objects from a Hashtable, the objects used as keys must implement the hashCode method and also the equals method.
8 Ιαν 2024 · HashMap uses Iterator to iterate over values, whereas Hashtable has Enumerator for the same. The Iterator is a successor of Enumerator that eliminates its few drawbacks. For example, Iterator has a remove() method to remove elements from underlying collections. The Iterator is a fail-fast iterator.
17 Απρ 2023 · In Hashtable vs hashmap, the hashtable is synchronized and thread-safe, making it suitable for multi-threaded applications, while Hashmap is not synchronized and faster than Hashtable, making it a better choice for single-threaded applications.
2 Μαρ 2012 · I understand that a Hashtable object cannot accept null values for either key or value entries, that it is synchronized collection, and that it uses slightly less memory than a HashMap. I'm wondering about the scenarios where it would be more appropriate to use a Hashtable instead of a HashMap .
12 Οκτ 2023 · This tutorial introduces the differences between Hashtable and HashMap in Java also lists some example codes to understand the topic. Hashtable is a class in Java collections framework that is used to store data in key-value pairs. It is a legacy class in Java and works on the hash concept to store elements.
