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.) …

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 …

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 …

Jan 13, 2016 · Tengo una estructura en HashMap y necesito iterarla a través de un for. Como puedo hacer esta iteración? Mi código: import java.util.HashMap; import java.util.Map; public …

Apr 23, 2009 · How are we able to sort a HashMap&lt;key, ArrayList&gt;? I want to sort on the basis of a value in the ArrayList.