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What are collection classes in C#?
Collection classes serve various purposes, such as allocating memory dynamically to elements and accessing a list of items on the basis of an index etc.
The following are the classes in Collections −
Sr.No | Class & Description & Useage |
---|---|
1 | ArrayList It represents ordered collection of an object that can be indexed individually. |
2 | Hashtable It uses a key to access the elements in the collection. |
3 | SortedList It uses a key as well as an index to access the items in a list. |
4 | Stack It represents a last-in, first out collection of object. |
5 | Queue It represents a first-in, first out collection of object. |
6 | BitArray It represents an array of the binary representation using the values 1 and 0. |
Let us see an example of the BitArray class in C# −
Example
using System; using System.Collections; namespace CollectionsApplication { class Program { static void Main(string[] args) { //creating two bit arrays of size 8 BitArray ba1 = new BitArray(8); BitArray ba2 = new BitArray(8); byte[] a = { 60 }; byte[] b = { 13 }; //storing the values 60, and 13 into the bit arrays ba1 = new BitArray(a); ba2 = new BitArray(b); //content of ba1 Console.WriteLine("Bit array ba1: 60"); for (int i = 0; i < ba1.Count; i++) { Console.Write("{0, -6} ", ba1[i]); } Console.WriteLine(); //content of ba2 Console.WriteLine("Bit array ba2: 13"); for (int i = 0; i < ba2.Count; i++) { Console.Write("{0, -6} ", ba2[i]); } Console.WriteLine(); BitArray ba3 = new BitArray(8); ba3 = ba1.And(ba2); //content of ba3 Console.WriteLine("Bit array ba3 after AND operation: 12"); for (int i = 0; i < ba3.Count; i++) { Console.Write("{0, -6} ", ba3[i]); } Console.WriteLine(); ba3 = ba1.Or(ba2); //content of ba3 Console.WriteLine("Bit array ba3 after OR operation: 61"); for (int i = 0; i < ba3.Count; i++) { Console.Write("{0, -6} ", ba3[i]); } Console.WriteLine(); Console.ReadKey(); } } }
Output
Bit array ba1: 60 False False True True True True False False Bit array ba2: 13 True False True True False False False False Bit array ba3 after AND operation: 12 False False True True False False False False Bit array ba3 after OR operation: 61 True False True True False False False False
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