Share. share. In Hashtable, you specify an object that can be used as a key and the value that goes with the key. Hashtable. No. HashTable on the other hand is the legacy class and was introduced prior to HashMap. The HashMap and Hashtable, both are used to represent a group of objects that are represented in pair. You must understand the differences between HashMap and HashTable as it is an important interview question for any Java professional to kickstart the career. HashMap vs Hashtable. report. HashMap. Hashtable Hashtable is basically a data structure to retain values of key-value pair. In single threaded environment, it is much faster than Hashtable.So if you do not work in multi thread environment ,then hashMap is recommended. HashMap Vs HashTable in Java. HashMap is preferred over the HashTable as HashTable is a legacy class and is considered as due to depreciation. HashTable was released in old versions of Java whereas ConcurrentHashMap is a java 5+ thing. ; Once the size of Hashtable and SynchronizedMap becomes considerable large because for the iteration it has to be locked for the longer duration. Synchronization of HashMap Vs. Hashtable; Both HashMap and Hashtable use hashing techniques to store values based on the key. Summary. I'm having trouble understanding when to use a hashmap and when to use a hashtable in java? HashMap vs HashTable. Posted by just now. On the other hand, Hashtable is thread safe, and therefore can be shared between multiple threads. 24.8k 14 14 gold badges 147 … It will throw NullPointerException. Vote. HashTable; 1: Introduction: Hashmap is the advanced version of HashTable and is introduced as a new class in JDK 1.2. Each pair is called Entry object. Close. Are you preparing for an interview for a Java profession? So we have seen the differences between the Binary Search Tree and Hash Table. hide. ** Both HashTable and HashMap implements Map interface. HashMap vs HashTable. The collection of Entries is referred by the object of HashMap and Hashtable. Hashtable vs HashMap: Parameter. In this article we are going to understand in detail regarding HashMap, HashSet and HashTable Log in or sign up to leave a comment Log In … Yes. Improve this answer. No. * It does not allow null for both key and value. 100% Upvoted. ThreadSafe. Comparison: BST vs HashTable. save. The basic Hashtable is quite similar to the HashMap, even down the method names. HashMap is not thread-safe. HashMap vs HashSet vs Hashtable – HashSet with Examples: Collections: HashMap, HashSet and Hashtable are a part of Collections. (HashMap Here) HashMap, HashSet and HashTable: HashMap, HashSet and Hashtable usually store values in key value pair. HashMap is fast as compared to HashTable. Follow edited Jan 19 '15 at 11:20. naXa. Yes. 0 comments. Keys in a collection must be unique or distinctive. Due to theadSafe and Synchronized,it is often slower than HashMap. When to use which data structure? We have already discussed other popular java interview questions like ArrayList vs Vector and Comparator vs Comparable.This question is generally asked in java intereview to check whether candidate understand correct usage of collection classes and has knowledge of alternative solutions. HashMap is the best thing to use in a single threaded application. Synchronized. Difference between HashMap and Hashtable is one of the most popular java interview questions. Performance. The primary difference between HashMap and Hashtable is that HashMap is not thread-safe, and therefore cannot be shared between multiple threads without external synchronization. While in ConcurrentHashMap, even if its size become very large, only portion or segment of the Map is locked which improves the performance in multithreading environment. 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