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 …

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 …

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 …

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 …

Jul 7, 2009 · I need to convert a HashMap<String, Object> to an array; could anyone show me how it's done?

Mar 26, 2013 · 20 I am new to java and practicing by creating a simplistic NaiveBayes classifier. I am still new to object instantiation, and wonder what to do to initialize a HashMap of …