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Queue with Examples in C#?
The Queue class in C# is the first-in, first-out collection of objects. Let us see some of the methods of the Queue class in C# −
Sr.No | Methods & Description |
---|---|
1 | Clear() Removes all objects from the Queue<T>. |
2 | Contains(T) Determines whether an element is in the Queue<T>. |
3 | CopyTo(T[], Int32) Copies the Queue>T< elements to an existing onedimensional Array, starting at the specified array index. |
4 | Dequeue() Removes and returns the object at the beginning of the Queue<T>. |
5 | Enqueue(T) Adds an object to the end of the Queue<T>. |
6 | Equals(Object) Determines whether the specified object is equal to the current object.(Inherited from Object) |
7 | GetEnumerator() Returns an enumerator that iterates through the Queue<T> |
8 | GetHashCode() Serves as the default hash function. (Inherited from Object) |
9 | GetType() Gets the Type of the current instance. |
Example
Let us now see some examples −
To get the object at the beginning of the Queue, the code is as follows −
using System; using System.Collections.Generic; public class Demo { public static void Main() { Queue<string> queue = new Queue<string>(); queue.Enqueue("A"); queue.Enqueue("B"); queue.Enqueue("C"); queue.Enqueue("D"); queue.Enqueue("E"); queue.Enqueue("F"); queue.Enqueue("G"); Console.WriteLine("Count of elements = "+queue.Count); Console.WriteLine("Element at the beginning of queue = " + queue.Peek()); } }
Output
This will produce the following output −
Count of elements = 7 Element at the beginning of queue = A
To remove all objects from the Queue, the code is as follows −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main() { Queue<string> queue = new Queue<string>(); queue.Enqueue("Gary"); queue.Enqueue("Jack"); queue.Enqueue("Ryan"); queue.Enqueue("Kevin"); queue.Enqueue("Mark"); queue.Enqueue("Jack"); queue.Enqueue("Ryan"); queue.Enqueue("Kevin"); Console.Write("Count of elements = "); Console.WriteLine(queue.Count); queue.Clear(); Console.Write("Count of elements (updated) = "); Console.WriteLine(queue.Count); } }
Output
This will produce the following output −
Count of elements = 8 Count of elements (updated) = 0
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