C# | Create a Queue from another collection
Queue represents a first-in, first out collection of object. It is used when you need a first-in, first-out access of items. When you add an item in the list, it is called enqueue, and when you remove an item, it is called deque. Queue
Properties :
- Enqueue adds an element to the end of the Queue.
- Dequeue removes the oldest element from the start of the Queue.
- Peek returns the oldest element that is at the start of the Queue but does not remove it from the Queue.
- The capacity of a Queue is the number of elements the Queue can hold.
- As elements are added to a Queue, the capacity is automatically increased as required by reallocating the internal array.
- Queue accepts null as a valid value for reference types and allows duplicate elements.
Syntax:
public T[] ToArray ();
Here T[] is a new array containing elements copied from the Queue
Below given are some examples to understand the implementation in a better way :
Example 1:
// C# code to Create a Queue // from a collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a Queue of strings Queue< string > myQueue1 = new Queue< string >(); // Inserting the elements into the Queue myQueue1.Enqueue( "w3wiki" ); myQueue1.Enqueue( "is" ); myQueue1.Enqueue( "the" ); myQueue1.Enqueue( "best" ); myQueue1.Enqueue( "website" ); // Displaying the count of elements // contained in the myQueue1 Console.Write( "Total number of elements in the Queue 1 are : " ); Console.WriteLine(myQueue1.Count); // Displaying the elements in Queue myQueue1 foreach ( string str in myQueue1) { Console.WriteLine(str); } // Creating a Queue from a collection Queue< string > myQueue2 = new Queue< string >(myQueue1.ToArray()); // Displaying the count of elements // contained in the myQueue2 Console.Write( "Total number of elements in the Queue 2 are : " ); Console.WriteLine(myQueue2.Count); // Displaying the elements in Queue myQueue2 foreach ( string str in myQueue2) { Console.WriteLine(str); } } } |
Output:
Total number of elements in the Queue 1 are : 5 w3wiki is the best website Total number of elements in the Queue 2 are : 5 w3wiki is the best website
Example 2:
// C# code to Create a Queue // from a collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a Queue of Integers Queue< int > myQueue1 = new Queue< int >(); // Inserting the elements into the Queue myQueue1.Enqueue(5); myQueue1.Enqueue(10); myQueue1.Enqueue(15); myQueue1.Enqueue(20); myQueue1.Enqueue(25); // Displaying the count of elements // contained in the myQueue1 Console.Write( "Total number of elements in the Queue 1 are : " ); Console.WriteLine(myQueue1.Count); // Displaying the elements in Queue myQueue1 foreach ( int i in myQueue1) { Console.WriteLine(i); } // Creating a Queue from a collection Queue< int > myQueue2 = new Queue< int >(myQueue1.ToArray()); // Displaying the count of elements // contained in the myQueue2 Console.Write( "Total number of elements in the Queue 2 are : " ); Console.WriteLine(myQueue2.Count); // Displaying the elements in Queue myQueue2 foreach ( int i in myQueue2) { Console.WriteLine(i); } } } |
Output:
Total number of elements in the Queue 1 are : 5 5 10 15 20 25 Total number of elements in the Queue 2 are : 5 5 10 15 20 25
Reference:
- https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.queue-1.toarray?view=netframework-4.7.2
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