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, …

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 …

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 …

As you have HashMap<String, HashMap>, you would need two loops - one for the outer and one for the inner HashMap. Btw - you should definitively type the second HashMap - don't know …

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

Sep 6, 2009 · If I have the value "foo", and a HashMap<String> ftw for which ftw.containsValue("foo") returns true, how can I get the corresponding key? Do I have to loop …

Sep 17, 2008 · Map<String, Integer> map = new HashMap<>(); String key = "a random key"; int count = map.getOrDefault(key, 0); // ensure count will be one of 0,1,2,3,... map.put(key, count …

HashMap<String, String> servicesNameHashmap = new HashMap<String, String>(); in your for loop. It will have same effect like same key and multiple values.

May 6, 2011 · What is the easiest way to get key associated with the max value in a map? I believe that Collections.max(someMap) will return the max Key, when you want the key that …