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, deleting values.

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

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 defined in the Map interface, while …

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 includes for …

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.) Method #1: …

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 tables to...

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 however, if we …

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 implement the Map …

Aug 6, 2014 · HashMap in Java is a widely used data structure, which allows key-value pairs to be stored and retrieved in constant time. In this article, we will look into how the get () and put () …

Nov 1, 2011 · So key for this HashMap is couresID, and value is a ArrayList of all grades (exam attempts) this person has made. The problem is I know how to work with array lists and hashmaps …