/
Factory.vb
57 lines (49 loc) · 1.68 KB
/
Factory.vb
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Module FactotyMethod
' Factory Method Design Pattern.
' See description in http://www.vb-net.ru/ProgramTheory/Factory.htm
Class MainApp
' Entry point into console application.
Public Shared Sub Main()
' An array of creators
Dim creators As Creator() = New Creator(1) {}
creators(0) = New ConcreteCreatorA()
creators(1) = New ConcreteCreatorB()
' Iterate over creators and create products
For Each creator As Creator In creators
Dim product As Product1 = creator.FactoryMethod()
Console.WriteLine("Created {0}", product.[GetType]().Name)
Next
' Wait for user
Console.ReadKey()
End Sub
End Class
' The 'Product' abstract class
MustInherit Class Product1
End Class
' A 'ConcreteProduct' class
Class ConcreteProductA
Inherits Product1
End Class
' A 'ConcreteProduct' class
Class ConcreteProductB
Inherits Product1
End Class
' The 'Creator' abstract class
MustInherit Class Creator
Public MustOverride Function FactoryMethod() As Product1
End Class
' A 'ConcreteCreator' class
Class ConcreteCreatorA
Inherits Creator
Public Overrides Function FactoryMethod() As Product1
Return New ConcreteProductA()
End Function
End Class
' A 'ConcreteCreator' class
Class ConcreteCreatorB
Inherits Creator
Public Overrides Function FactoryMethod() As Product1
Return New ConcreteProductB()
End Function
End Class
End Module