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Collection classes have various uses, such as dynamically allocating memory to elements, accessing a list of items based on index, etc.
The following are the classes in Collections:
| Serial number | Category and description and usage |
|---|---|
| 1 |
ArrayList It represents an ordered collection of objects that can be individually indexed. |
| 2 |
Hashtable It uses keys to access elements in the collection. |
| 3 |
SortedList It uses keys and indexes to access items in the list. |
| 4 |
Stack It represents a last-in-first-out collection of objects. |
| 5 |
Queue It represents a first-in, first-out collection of objects. |
| 6 |
BitArray It represents an array using binary representation of values 1 and 0 . |
Let’s look at an example of the BitArray class in C#:
Online Demo
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();
}
}
}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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