Interfaces

Create the interface and define required behavior. An access specifier is not required.

Public Interface I_Test

    Function Foo() As String

End Interface

Implement the interface in the desired class:

Public MustInherit Class ShoppingListItem
    Implements I_Test

Now, implement the behaviors (you will have errors until you do):

          Public Function Foo() As String Implements I_Test.Foo
        Return "Foo"
    End Function