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Module Module1
Sub Main()
Dim objParent As ParentClass = New ChildClass
objParent.GeneralFunc()
objParent.OverridAbleFunc()
Console.WriteLine("")
Dim winarray(3) As Control
winarray(0) = New Control(1, 2)
winarray(1) = New Label(3, 4, "aaa")
winarray(2) = New Button(1, 2)
For Each c As Control In winarray
If c Is Nothing Then Continue For
c.DrawControl()
Next
Console.ReadLine()
End Sub
Public Class ParentClass
Public Sub GeneralFunc()
Console.WriteLine("ParentGeneralFunc")
End Sub
Public Overridable Sub OverridAbleFunc()
Console.WriteLine("ParentOverridAbleFunc")
End Sub
End Class
Public Class ChildClass
Inherits ParentClass
Public Shadows Sub GeneralFunc()
Console.WriteLine("ChildGeneralFunc")
End Sub
Public Overrides Sub OverridAbleFunc()
Console.WriteLine("ChildOverridAbleFunc")
End Sub
End Class
Public Class Control
Protected top As Integer
Protected left As Integer
Public Sub New(ByVal top As Integer, ByVal left As Integer)
Me.top = top : Me.left = left
End Sub
Public Overridable Sub DrawControl()
Console.WriteLine("Control:Drawing controls as {0}, {1}", top, left)
End Sub
End Class
Public Class Label
Inherits Control
Private text As String
Public Sub New(ByVal top As Integer, ByVal left As Integer, ByVal n As String)
MyBase.New(top, left)
Me.text = n
End Sub
Public Overrides Sub DrawControl()
MyBase.DrawControl()
Console.WriteLine("Writing string to the Listbox:{0}", text)
End Sub
End Class
Public Class Button
Inherits Control
Public Sub New(ByVal top As Integer, ByVal left As Integer)
MyBase.New(top, left)
End Sub
Public Overrides Sub DrawControl()
Console.WriteLine("Drawing a button at {0}, {1}", top, left)
End Sub
End Class
End Module
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