Answer / manikandan

When global and local varible in the same name.
the local varibale in a mehod or function which use to
override the global is called the shadowing.
ie the Global varible is being shadowed by the
local varible

Answer / sonia.sardana

If there are overloaded methods in the base class, & u
marks one of the methods as shadows using the keyword
shadow in the derived class, then we cannot access the
overloaded methods.

Ex-
public class base
public sub test()
console.writeline("sonia")
end sub

public sub test(i as integer)
console.writeline(i)
end sub

end class

public sub derived
inherirts base
shadows sub test(x as integer)
console.writeline("Shadow method")
end sub
end class


sub main()
dim obj as new derived
obj.test()-->Invalid
obj.test(10)-->Valid
end sub

Answer / rohit

Whatever the code written by Sonia.sardana is shows the
shadowing concept but there is some print mistakes in the
code.The correct code is---


imports system
module m1
public class base
Public Sub test()
Console.WriteLine("sonia")
End Sub

Public Sub test(ByVal i As Integer)
Console.WriteLine(i)
End Sub

End Class

Public class derived
inherits base

Shadows Sub test(ByVal x As Integer)
Console.WriteLine("Shadow method")
End Sub
end class


Sub main()
Dim obj As New derived
obj.test() 'This will show error
obj.test(10) 'This is valid
End Sub

end module

Answer / nand lal

shadowing in general is when two variables/methods or any
other element has same name and any one of the both can
shadow( in OOP case override) the behavior of other.

Answer / rohatash

there are overloaded methods in the base class, & u
marks one of the methods as shadows using the keyword
shadow in the derived class, then we cannot access the
overloaded methods.
Module Module1

Class A
Public Sub Show()
Console.WriteLine("Calling from A")
End Sub
End Class

Class B
Inherits A
Public Shadows Sub Show()
Console.WriteLine("Calling from B")
End Sub
End Class

Class C
Inherits B
Public Shadows Sub Show()
Console.WriteLine("Calling from C")
End Sub
End Class

Class Test
Public Shared Sub Main()
Dim x As A
x = New A()
x.Show()
x = New B()
x.Show()
x = New C()
x.Show()
End Sub
End Class

End Module

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0 Answers  

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0 Answers  

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0 Answers