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collections

What is the difference between Collection and List in Java?

by IT Nursery

What is the difference between Collection and List in Java? When should I use which? 7 Answers 7

Tags collections, java

Select N random elements from a List in C#

by IT Nursery

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

Tags algorithm, c, collections, element, random

Is there a built-in method to compare collections?

by IT Nursery

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

Tags .net, c, collections

Difference between HashSet and HashMap?

by IT Nursery

Apart from the fact that HashSet does not allow duplicate values, what is the difference between HashMap and HashSet? I mean implementation wise? … Read more

Tags collections, hashmap, hashset, java

Assert equals between 2 Lists in Junit

by IT Nursery

How can I make an equality assertion between lists in a JUnit test case? Equality should be between the content of the list. … Read more

Tags collections, java, junit, unit-testing

count vs length vs size in a collection

by IT Nursery

From using a number of programming languages and libraries I have noticed various terms used for the total number of elements in a … Read more

Tags collections, naming-conventions, semantics, terminology

How can I initialize an ArrayList with all zeroes in Java?

by IT Nursery

It looks like arraylist is not doing its job for presizing: // presizing ArrayList<Integer> list = new ArrayList<Integer>(60); Afterwards when I try to … Read more

Tags collections, java

Case-INsensitive Dictionary with string key-type in C#

by IT Nursery

If I have a Dictionary<String,…> is it possible to make methods like ContainsKey case-insensitive? This seemed related, but I didn’t understand it properly: … Read more

Tags c, collections, generic-collections

Immutable vs Unmodifiable collection [duplicate]

by IT Nursery

This question already has answers here: Java Immutable Collections (7 answers) Closed 2 days ago. From the Collections Framework Overview: Collections that do … Read more

Tags collections, immutability, java

How to sort Counter by value? – python

by IT Nursery

Other than doing list comprehensions of reversed list comprehension, is there a pythonic way to sort Counter by value? If so, it is … Read more

Tags collections, counter, python, sorting
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