' Visual Basic 2008 9.0 .NET Examples - Implementation - Object Oriented Programming : 
Namespace Exercise4
    Class Robot
        Private m_X As Integer
        Public ReadOnly Property X() As Integer
            Get
                X = m_X
            End Get
        End Property
        Private m_Y As Integer
        Public ReadOnly Property Y() As Integer
            Get
                Y = m_Y
            End Get
        End Property
        Private m_Direction As Integer
        Public Sub Rotate()
            m_Direction += 1
            If m_Direction > 3 Then m_Direction = 0
        End Sub
        Public Sub PlaceStep()
            Select Case m_Direction
                Case 0 ' up
                    m_Y += 1
                Case 1 ' right
                    m_X += 1
                Case 2 ' down
                    m_Y -= 1
                Case 3 ' left
                    m_X -= 1
            End Select
        End Sub
    End Class
    Module RobotTestFixture
        Public Sub Main()
            Dim robot1 As Robot = New Robot
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 0)
            '
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 1)
            '
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 2)
            '
            robot1.Rotate()
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 2)
            '
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 1)
            Console.WriteLine(robot1.Y = 2)
            '
            robot1.Rotate()
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 1)
            Console.WriteLine(robot1.Y = 1)
            '
            robot1.Rotate()
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 1)
            '
            robot1.Rotate()
            robot1.PlaceStep()
            Console.WriteLine(robot1.X = 0)
            Console.WriteLine(robot1.Y = 2)
            '
            Console.ReadLine()
        End Sub
    End Module
End Namespace
' Visit www.studyvb.com for more examples.  Copyright 2003-2008 De Wolf.