Stack類表示對象的後進先出集合。當需要對專案進行後進先出訪問時使用它。當在列表中添加一個專案時稱為推送專案，當刪除它時稱為彈出項目。
Stack類的屬性和方法
下表列出了Stack類的一些常用屬性：
| 編號 | 屬性 | 描述 |
|---|---|---|
| 1 | Count |
獲取堆疊中包含的元素的數量。 |
下表列出了Stack類的一些常用方法：
| 編號 | 方法 | 描述 |
|---|---|---|
| 1 | Public Overridable Sub Clear |
刪除堆疊中的所有元素。 |
| 2 | Public Overridable Function Contains (obj As Object) As Boolean |
確定元素是否在堆疊中。 |
| 3 | Public Overridable Function Peek As Object |
返回堆疊頂部的對象而不刪除它。 |
| 4 | Public Overridable Function Pop As Object |
刪除並返回堆疊頂部的對象。 |
| 5 | Public Overridable Sub Push (obj As Object) |
在堆疊頂部插入一個對象。 |
| 6 | Public Overridable Function ToArray As Object() |
將堆疊複製到新數組。 |
示例
以下示例演示如何使用堆疊：
Imports System.Collections
Module MyStack
Sub Main()
Dim st As Stack = New Stack()
st.Push("A")
st.Push("M")
st.Push("G")
st.Push("W")
Console.WriteLine("Current stack: ")
Dim c As Char
For Each c In st
Console.Write(c + " ")
Next c
Console.WriteLine()
st.Push("V")
st.Push("H")
Console.WriteLine("The next poppable value in stack: {0}", st.Peek())
Console.WriteLine("Current stack: ")
For Each c In st
Console.Write(c + " ")
Next c
Console.WriteLine()
Console.WriteLine("Removing values ")
st.Pop()
st.Pop()
st.Pop()
Console.WriteLine("Current stack: ")
For Each c In st
Console.Write(c + " ")
Next c
Console.ReadKey()
End Sub
End Module
執行上面示例代碼，得到以下結果 -
F:\worksp\vb.net\collection>vbc MyStack.vb
Microsoft (R) Visual Basic Compiler version 14.0.1038
for Visual Basic 2012
Copyright (c) Microsoft Corporation. All rights reserved.
This compiler is provided as part of the Microsoft (R) .NET Framework, but only supports language versions up to Visual Basic 2012, which is no longer the latest version. For compilers that support newer versions of the Visual Basic programming language, see http://go.microsoft.com/fwlink/?LinkID=533241
F:\worksp\vb.net\collection>MyStack.exe
Current stack:
W G M A
The next poppable value in stack: H
Current stack:
H V W G M A
Removing values
Current stack:
G M A