![]() ![]() Use HashMap if you do not need councurrency. We also learned how a hastable is different from hashmap in Java.ĭo not use Hashtable in your new applications. In this tutorial, we learned about Java Hashtable class, it’s constructors, methods, real life usecases and compared their performances. Enumerator in Hashtable is not fail-fast. Hashtable is traversed by Enumerator and Iterator. Hashtable is slow due to added synchronization. ![]() Hashtable doesn’t allow any null key or value. HashMap allows one null key and multiple null values.Let’s quickly list down the differences between a hashmap and hashtable in Java. Best is to use ConcurrentHashMap class which provide much higher degree of concurrency. A well thought design will perform much better than Hashtable. We are better off externally synchronizing a HashMap. The naive approach to thread-safety in Hashtable (“synchronizing every method”) makes it very much worse for threaded applications. Performance wise HashMap performs in O(log(n)) in comparion to O(n) in Hashtable for most common operations such as get(), put(), contains() etc. ![]() ("Key: " + key + ", Value: " + mappedValue) Iterator itr = hashtable.keySet().iterator() Let’s see a example for how to use Hashtable in java programs.
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