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, …

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 …

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 …

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.) …

On an average, the time complexity of a HashMap insertion, deletion, and the search takes O (1) constant time in java, which depends on the loadfactor (number of entries present in the hash …

A hash_map is an older, unstandardized version of what for standardization purposes is called an unordered_map (originally in TR1, and included in the standard since C++11). As the name …

I'm using a HashMap. When I iterate over the map, the data is returned in (often the same) random order. But the data was inserted in a specific order, and I need to preserve the …

HashMap<String, HashMap> selects = new HashMap<String, HashMap>(); For each Hash<String, HashMap> I need to create a ComboBox, whose items are the value (which …

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 …