How do I convert a Map to List in Java?
List<Value> list = new ArrayList<Value>(map.values()); assuming: Map<Key,Value> map;
collections
Filtering collections in C#
I am looking for a very fast way to filter down a collection in C#. I am currently using generic List<object> collections, but … Read more
Comparing two collections for equality irrespective of the order of items in them
I would like to compare two collections (in C#), but I’m not sure of the best way to implement this efficiently. I’ve read … Read more
Should I return a Collection or a Stream?
Suppose I have a method that returns a read-only view into a member list: class Team { private List<Player> players = new ArrayList<>(); … Read more
Big-O summary for Java Collections Framework implementations? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, … Read more
how to get the one entry from hashmap without iterating
Is there a elegant way of obtaining only one Entry<K,V> from HashMap, without iterating, if key is not known. As order of entry … Read more
How to check if IEnumerable is null or empty?
I love string.IsNullOrEmpty method. I’d love to have something that would allow the same functionality for IEnumerable. Is there such? Maybe some collection … Read more
What is the difference between Collection and List in Java?
What is the difference between Collection and List in Java? When should I use which? Best Answer 7
Select N random elements from a List in C#
I need a quick algorithm to select 5 random elements from a generic list. For example, I’d like to get 5 random elements … Read more
Is there a built-in method to compare collections?
I would like to compare the contents of a couple of collections in my Equals method. I have a Dictionary and an IList. … Read more
