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VB.Net - Queue隊(duì)列

2018-12-16 17:15 更新

Queue表示對(duì)象的先進(jìn)先出集合。當(dāng)您需要項(xiàng)目的先進(jìn)先出訪問(wèn)時(shí)使用。當(dāng)您在列表中添加項(xiàng)目時(shí)，它被稱為enqueue，當(dāng)您刪除項(xiàng)目時(shí)，稱為deque。

隊(duì)列類的屬性和方法

下表列出了Queue類的一些常用屬性：

屬性	描述
Count	Gets the number of elements contained in the Queue. 獲取隊(duì)列中包含的元素?cái)?shù)。

下表列出了Queue類的一些常用方法：

S.N	方法名稱和用途
1	Public Overridable Sub Clear Removes all elements from the Queue. 從隊(duì)列中刪除所有元素。
2	Public Overridable Function Contains (obj As Object) As Boolean Determines whether an element is in the Queue. 確定元素是否在隊(duì)列中。
3	Public Overridable Function Dequeue As Object Removes and returns the object at the beginning of the Queue. 刪除并返回隊(duì)列開頭的對(duì)象。
4	Public Overridable Sub Enqueue (obj As Object) Adds an object to the end of the Queue. 將對(duì)象添加到隊(duì)列的末尾。
5	Public Overridable Function ToArray As Object() Copies the Queue to a new array. 將隊(duì)列復(fù)制到新數(shù)組。
6	Public Overridable Sub TrimToSize Sets the capacity to the actual number of elements in the Queue. 將容量設(shè)置為隊(duì)列中實(shí)際的元素?cái)?shù)。

示例：

以下示例演示如何使用隊(duì)列：

Module collections
   Sub Main()
      Dim q As Queue = New Queue()
      q.Enqueue("A")
      q.Enqueue("M")
      q.Enqueue("G")
      q.Enqueue("W")
      Console.WriteLine("Current queue: ")
      Dim c As Char
      For Each c In q
          Console.Write(c + " ")
      Next c
      Console.WriteLine()
      q.Enqueue("V")
      q.Enqueue("H")
      Console.WriteLine("Current queue: ")
      For Each c In q
          Console.Write(c + " ")
      Next c
      Console.WriteLine()
      Console.WriteLine("Removing some values ")
      Dim ch As Char
      ch = q.Dequeue()
      Console.WriteLine("The removed value: {0}", ch)
      ch = q.Dequeue()
      Console.WriteLine("The removed value: {0}", ch)
      Console.ReadKey()
   End Sub
End Module

當(dāng)上述代碼被編譯和執(zhí)行時(shí)，它產(chǎn)生以下結(jié)果：

Current queue: 
A M G W 
Current queue: 
A M G W V H 
Removing some values
The removed value: A
The removed value: M

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