ASP.NET入门教程 9.4.2 继承[2]

（）在同一个文件中创建另一个类Car:

Public Class Car

Inherits Vehicle

Public Sub New()

_wheels =

_topSpeed =

_warningSound = Honk

End Sub

End Class

（）现在再创建另一个类Bike:

Public Class Bike

Inherits Vehicle

Public Sub New()

_wheels =

MyBaseTopSpeed =

_warningSound = Ring Ring

End Sub

End Class

（）继续创建另一个类Skateboard:

Public Class Skateboard

Inherits Vehicle

Public Sub New()

_wheels =

_topSpeed =

End Sub

Public Overrides Function Warning() As String

Return No warning youll have to shout yourself

End Function

End Class

在End Sub和End Class之间输入以下代码

Public Overrides

现在按下空格键可以看到弹出了一个小小的帮助提示

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