C# |从另一个集合创建队列
原文:https://www . geeksforgeeks . org/c-sharp-create-queue-from-other-collection/
队列代表一个 先进先出 集合的对象。当您需要先进先出访问项目时，可以使用它。当您在列表中添加一个项目时，它被称为入队，当您移除一个项目时，它被称为出队。排队。用于将队列元素复制到新数组的数组方法 。
属性:
- Enqueue Add an element at the end of the queue.
- dequeue Remove the oldest element from the beginning of the queue.
- peek returns the earliest element in the queue, but it will not be removed from the queue.
- The capacity of the queue is the number of elements that the queue can hold.
- When elements are added to the queue, the capacity will automatically increase as needed by reallocating the internal array.
- The queue accepts null as the valid value of the reference type, and allows duplicate elements.
语法:
public T[] ToArray ();
这里 T[] 是一个新数组，包含从队列复制的元素。
下面给出了一些例子，以便更好地理解实现:
例 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("GeeksforGeeks");
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
GeeksforGeeks
is
the
best
website
Total number of elements in the Queue 2 are : 5
GeeksforGeeks
is
the
best
website
例 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
参考:
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