VB.NET tutorial-Abstract Class
Object-Oriented Programming (OOP)
Abstract Class
An abstract class is created for the purpose of being inherited. We cannot create objects from the abstract class.
Example:
Module Module1
Sub Main()
Dim d As New Dog
d.setnumberOflegs(4) 'setnumberOflegs was inherited from the Animal class
d.setdogName("Aluk")
Console.WriteLine("Dog Name: " & d.getdogName())
Console.WriteLine("Number of legs: " & d.getnumberOflegs())
'getnumberOflegs was inherited from the Animal class
Console.ReadLine()
End Sub
Class Animal : Inherits AbsAnimal 'inherit abstract class
Private numberOflegs As Integer
Public Overrides Sub setnumberOflegs(ByVal n As Integer) ' override abstract method
numberOflegs = n
End Sub
Public Overrides Function getnumberOflegs() As Integer ' override abstract method
getnumberOflegs = numberOflegs
End Function
End Class
Class Dog : Inherits Animal
Private dogName As String
Public Sub setdogName(ByVal name As String)
dogName = name
End Sub
Public Function getdogName() As String
getdogName = dogName
End Function
End Class
MustInherit Class AbsAnimal
Public MustOverride Sub setnumberOflegs(ByVal n As Integer)
Public MustOverride Function getnumberOflegs() As Integer
End Class
End Module
Note:
You must add the keyword MustInherit before the class AbsAnimal to make it
abstract. MustOveride keywords are used to make methods abstract. Methods in
derived class must use Overrides keywords to override the methods of its
abstract base class.
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