What are the differences between a HashMap and a Hashtable in Java? Which is more efficient for non-threaded applications?

Map<String, String> myMap = new HashMap<String, String>() {{ put("a", "b"); put("c", "d"); }}; However, the anonymous subclass might introduce unwanted behavior in some cases. This …

Apr 7, 2010 · Hashmap is used for storing data in key value pairs. We can use a hashmap for storing objects in a application and use it further in the same application for storing, updating, …

Jan 5, 2017 · 64 Map is an interface that HashMap implements. The difference is that in the second implementation your reference to the HashMap will only allow the use of functions …

Jul 1, 2009 · Since all maps in Java implement the Map interface, the following techniques will work for any map implementation (HashMap, TreeMap, LinkedHashMap, Hashtable, etc.) …

Sep 26, 2008 · if you are talking in terms of Java, both are collections which allow objects addition, deletion and updation and use Hasing algorithms internally. The significant difference …

Apart from the fact that HashSet does not allow duplicate values, what is the difference between HashMap and HashSet in their implementation? It's a little bit vague because both use hash …

Mar 15, 2010 · HashMap is implemented by Hash Table while TreeMap is implemented by Red-Black tree. The main difference between HashMap and TreeMap actually reflect the main …

What is the difference between HashMap, LinkedHashMap and TreeMap in Java? I don't see any difference in the output as all the three has keySet and values. Also, what are Hashtables? …

Nov 6, 2008 · Note that there is a difference between the "Map" abstract data type and the Map Java interface. As mentioned in other answers, the legacy Dictionary class does not …