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010Visual Basic二谈建造者模式

程序员文章站 2024-01-19 08:13:40
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009Visual Basic建造者模式

下面的示例是一个控制台程序

1.建造者

‘父类
Public MustInherit Class Builder
    Public MustOverride Sub BuildPartA()
    Public MustOverride Sub BuildPartB()
    Public MustOverride Function GetResult() As product
End Class

’子一
Public Class ConcreteBuilder1
    Inherits Builder

    Private myProduct As Product = New Product
   
    Public Overrides Sub BuildPartA()
        myProduct.add("部件A")
    End Sub

    Public Overrides Sub BuildPartB()
        myProduct.add("部件B")
    End Sub

    Public Overrides Function GetResult() As Product
        Return myProduct
    End Function
End Class


‘子二
Public Class ConcreteBuilder2
    Inherits Builder

    Private myProduct As Product = New Product

    Public Overrides Sub BuildPartA()
        myProduct.add("部件X")
    End Sub

    Public Overrides Sub BuildPartB()
        myProduct.add("部件Y")
    End Sub

    Public Overrides Function GetResult() As Product
        Return myProduct
    End Function
End Class

2.产品类

Public Class Product
    Private parts As IList(Of String) = New List(Of String)

    Public Sub add(ByVal part As String)
        parts.Add(part)
    End Sub

    Public Sub show()
        Console.WriteLine("产品创建------------")
        For Each part In parts
            Console.WriteLine(part)
        Next
    End Sub

End Class

3.指挥者

Public Class Director
    Public Sub New(ByVal b As Builder)
        b.BuildPartA()
        b.BuildPartB()
    End Sub
End Class

4.客户端

Module Module1

    Sub Main()
        Dim b1 As Builder = New ConcreteBuilder1
        Dim b2 As Builder = New ConcreteBuilder2

        Dim myDirector As Director = New Director(b1)
        Dim p1 As Product = b1.GetResult
        p1.show()

        myDirector = New Director(b2)
        Dim p2 As Product = b2.GetResult
        p2.show()

        Console.Read()
    End Sub

End Module