Interface inherits interface

Imports System

Public Class MainClass
    
    Shared Sub Main()
        Dim doc As New Document("Test Document")

        If TypeOf doc Is IStorable Then
            Dim isDoc As IStorable = doc
            isDoc.Read()
        Else
            Console.WriteLine("Could not cast to IStorable")
        End If

        If TypeOf doc Is ICompressible2 Then
            Dim ilDoc As ICompressible2 = doc
            Console.Write("Calling both ICompressible and ")
            Console.WriteLine("ICompressible2 methods...")
            ilDoc.Compress()
            ilDoc.LogSavedBytes()
        Else
            Console.WriteLine("Could not cast to ICompressible2")
        End If

        If TypeOf doc Is ICompressible Then
            Dim icDoc As ICompressible = doc
            Console.WriteLine( _
               "Treating the object as Compressible... ")
            icDoc.Compress()
        Else
            Console.WriteLine("Could not cast to ICompressible")
        End If
    End Sub
End Class


     Interface IStorable
         Sub Read()
         Sub Write(ByVal obj As Object)

         Property Status() As Integer
     End Interface

     Interface ICompressible
         Sub Compress()
         Sub Decompress()
     End Interface

     Interface ICompressible2
         Inherits ICompressible
         Sub LogSavedBytes()
     End Interface 

     Public Class Document
         Implements ICompressible2, IStorable

         Public Sub New(s As String)
             Console.WriteLine("Creating document with: {0}", s)
         End Sub

         Public Sub Read() Implements IStorable.Read
             Console.WriteLine("Implementing the Read Method for IStorable")
         End Sub

         Public Sub Write(ByVal o As Object) Implements IStorable.Write
             Console.WriteLine( _
                   "Implementing the Write Method for IStorable")
         End Sub

         Public Property Status() As Integer Implements IStorable.Status
             Get
                 Return myStatus
             End Get
             Set(ByVal Value As Integer)
                 myStatus = Value
             End Set
         End Property

         Public Sub Compress() Implements ICompressible.Compress
             Console.WriteLine("Implementing Compress")
         End Sub

         Public Sub Decompress() Implements ICompressible.Decompress
             Console.WriteLine("Implementing Decompress")
         End Sub

         Public Sub LogSavedBytes() Implements ICompressible2.LogSavedBytes
             Console.WriteLine("Implementing LogSavedBytes")
         End Sub

         Private myStatus As Integer = 0

     End Class

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6.	Interface Inherits another Interface
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Interface inherits interface : Interface « Class « VB.Net

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