encapsulation examples

[davegreen]

Hi, I have searched and searched for a code example which shows some basic programming that does not use encapsulation and then the same code but changed to represent encapsulation...

All i can find is examples of encapsulated code

Could someone please post me some simple code snippets

-snippet of some simple code that doesnt use encapsulation

and

-snippet of that same code modified to represent encapsulation

any help would be greatley appriciated

[dlscott56]

Is this for a class?

[cicatrix]

' A class without encapsulation:

Class A
   Public Field As Integer

   Public Function MethodA() As Integer
        Return Field + 1
   End Function
End Class

The class above exposes its field directly to the user so it can be accessed from anywhere.

Class B
   Private _Field As Integer
   Private Function MethodB() As Integer
       Return _Field + 1
   End Function

   Public Property Field As Integer
       Get
           Return _Field
       End Get
       Set(ByVal value As Integer)
           _Field = value
       End Set
    End Property

    Public ReadOnly Property Result As Integer
       Get
          Return MethodB
       End Get
    End Property
End Class

The second method encapsulates a private field which can be accesses only through a public property and you can perform validation in the 'Set' block. Also it encapsulates a 'business logic' method (MethodB) and only returns result through the readonly property. Using this technique you can protect your private members from any outside interference.