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Queue表示对象的先进先出集合。 当您需要项目的先进先出访问时使用。 当您在列表中添加项目时,它被称为enqueue,当您删除项目时,称为deque。
队列类的属性和方法
下表列出了Queue类的一些常用属性:
属性 | 描述 |
---|---|
Count | Gets the number of elements contained in the Queue. 获取队列中包含的元素数。 |
下表列出了Queue类的一些常用方法:
S.N | 方法名称和用途 |
---|---|
1 | Public Overridable Sub ClearRemoves all elements from the Queue.从队列中删除所有元素。 |
2 | Public Overridable Function Contains (obj As Object) As BooleanDetermines whether an element is in the Queue.确定元素是否在队列中。 |
3 | Public Overridable Function Dequeue As ObjectRemoves and returns the object at the beginning of the Queue.删除并返回队列开头的对象。 |
4 | Public Overridable Sub Enqueue (obj As Object)Adds an object to the end of the Queue.将对象添加到队列的末尾。 |
5 | Public Overridable Function ToArray As Object()Copies the Queue to a new array.将队列复制到新数组。 |
6 | Public Overridable Sub TrimToSizeSets the capacity to the actual number of elements in the Queue.将容量设置为队列中实际的元素数。 |
示例:
以下示例演示如何使用队列:
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
当上述代码被编译和执行时,它产生以下结果:
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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