'Visual Basic 2008/2010 Redefinition - Overridable en Overrides Object Oriented Programming
Class Holiday
    Private m_Items As Flight()
    Private m_Count As Integer
    Public ReadOnly Property Count() As Integer
        Get
            Count = m_Count
        End Get
    End Property
    Public Sub Add(ByVal flight As Flight)
        ReDim Preserve m_Items(Count)
        m_Items(Count) = flight
        m_Count += 1
    End Sub
    Default Public ReadOnly Property Item(ByVal index As Integer) As Flight
        Get
            Item = m_Items(index)
        End Get
    End Property
End Class
Class Flight
    Public Sub New(ByVal departure As Airport, ByVal arrival As Airport)
        Me.Departure = departure
        Me.Arrival = arrival
    End Sub
    Private m_Departure As Airport
    Public Property Departure() As Airport
        Get
            Departure = m_Departure
        End Get
        Set(ByVal value As Airport)
            m_Departure = value
        End Set
    End Property
    Private m_Arrival As Airport
    Public Property Arrival() As Airport
        Get
            Arrival = m_Arrival
        End Get
        Set(ByVal value As Airport)
            m_Arrival = value
        End Set
    End Property
    Public Overrides Function ToString() As String
        ToString = Departure.ToString() & " -> " & Arrival.ToString()
    End Function
End Class
Class Airport
    Public Sub New(ByVal code As String, ByVal Name As String)
        Me.Code = code
        Me.Name = Name
    End Sub
    Private m_Code As String
    Public Property Code() As String
        Get
            Code = m_Code
        End Get
        Set(ByVal value As String)
            m_Code = value
        End Set
    End Property
    Private m_Name As String
    Public Property Name() As String
        Get
            Name = m_Name
        End Get
        Set(ByVal value As String)
            m_Name = value
        End Set
    End Property
    Public Overrides Function ToString() As String
        ToString = Code & " : " & Name
    End Function
End Class
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