vbs中class的使用示例

从网上看到一个vbs中使用class的例子, 转出来，共同学习！

 

Class ArrayList
Private items()
Private size

Private Sub Class_Initialize
   size = 0
   ReDim items(1)
End Sub
Private Sub Class_Terminate
   ReDim items(1)
   'jince 怎样解引用？
   'Set items = Nothing
End Sub

Public Function Add(ByVal value)
   dim1 = Ubound(items)
   dim1 = Ubound(items,1)
   dim2 = Ubound(items,2)
   If (size = Ubound(items)) Then EnsureCapacity((size + 1))
   items(size) = value
   size = size + 1
   Add = size
End Function

Public Property Get Item(index)
   Item = items(index)
End Property

Public Property Let Item(index, vObject)
   items(index) = vObject
End Property

Property Get Count
   Count = size
End Property

Public Property Get Capacity()
   Capacity = Ubound(items)
End Property

Public Property Let Capacity(value)
   If (value <> Ubound(items)) Then
    If (value < size) Then Err.Rise 6
    If (value > 0) Then
     ReDim Preserve items(value)
    Else
     ReDim Preserve items(3)
    End If
   End If
End Property
  
Private Sub EnsureCapacity(ByVal min)
   If (Ubound(items) < min) Then
    Dim num1 : num1 = IIf((Ubound(items) = 0), 4, (Ubound(items) * 2))
    If (num1 < min) Then num1 = min
    Capacity = num1
   End If
End Sub

Private Function IIf(j, r1, r2)
   IF (j) Then
    IIf = r1
   Else
    IIf = r2
   End IF
End Function
End Class

'示例:
Dim al : Set al = new ArrayList
al.Add(1)
al.Add(2)
al.Add(3)
al.Add(4)
al.Add(5)
al.Add(6)
al.Add(7)
al.Add(8)
al.Add(9)
al.Add(10)
For i = 0 To al.Count -1
w("Index"& i &": "& al.Item(i))
Next
w("Count: "& al.Count)
w("Capacity: "& al.Capacity)

Sub w(o)
Debug.WriteLine(o)
End Sub