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| Define and use Class: Property |
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Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Configuration
Imports System.Resources
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.IO
Imports System.Drawing.Printing
Public Class MainClass
Shared Sub Main()
Dim objCar As New Car
'Set the Color property to Red
objCar.Color = "Red"
'Show what the value of the property is
Console.WriteLine("My car is this color:")
Console.WriteLine(objCar.Color)
'Report the speed
Console.WriteLine("The car's speed is:")
Console.WriteLine(objCar.Speed)
'Accelerate
objCar.Accelerate(5)
'Report the new speed
Console.WriteLine("The car's speed is now:")
Console.WriteLine(objCar.Speed)
'Report the number of doors
Console.WriteLine("The number of doors is:")
Console.WriteLine(objCar.NumberOfDoors)
'Try changing the number of doors to 1000
objCar.NumberOfDoors = 1000
'Report the number of doors
Console.WriteLine("The number of doors is:")
Console.WriteLine(objCar.NumberOfDoors)
'Now try changing the number of doors to 2
objCar.NumberOfDoors = 2
'Report the number of doors
Console.WriteLine("The number of doors is:")
Console.WriteLine(objCar.NumberOfDoors)
'Accelerate the car to 25mph
objCar.Accelerate(25)
'Report whether or not the car is moving
If objCar.IsMoving = True Then
Console.WriteLine("The car is moving.")
Else
Console.WriteLine("The car is stopped.")
End If
End Sub
End Class
Public Class Car
Implements IDisposable
Public Color As String
Public HorsePower As Integer
Private _speed As Integer
Private _numberOfDoors As Integer
Public ReadOnly Property Speed() As Integer
Get
Return _speed
End Get
End Property
Public Sub Accelerate(ByVal accelerateBy As Integer)
'Adjust the speed
_speed += accelerateBy
End Sub
Public Property NumberOfDoors() As Integer
Get
Return _numberOfDoors
End Get
Set(ByVal value As Integer)
'Is the new value between two and five
If value >= 2 And value <= 5 Then
_numberOfDoors = value
End If
End Set
End Property
Public Function IsMoving() As Boolean
'Is the car's speed zero?
If Speed = 0 Then
Return False
Else
Return True
End If
End Function
'Constructor
Public Sub New()
'Set the default values
Color = "White"
_speed = 0
_numberOfDoors = 5
End Sub
Public Overridable Function CalculateAccelerationRate() As Double
Return 4.2
End Function
Private disposed As Boolean = False
' IDisposable
Private Overloads Sub Dispose(ByVal disposing As Boolean)
If Not Me.disposed Then
If disposing Then
' TODO: put code to dispose managed resources
End If
' TODO: put code to free unmanaged resources here
End If
Me.disposed = True
End Sub
#Region " IDisposable Support "
' This code added by Visual Basic to correctly implement the disposable pattern.
Public Overloads Sub Dispose() Implements IDisposable.Dispose
' Do not change this code. Put cleanup code in Dispose(ByVal disposing As Boolean) above.
Dispose(True)
GC.SuppressFinalize(Me)
End Sub
Protected Overrides Sub Finalize()
' Do not change this code. Put cleanup code in Dispose(ByVal disposing As Boolean) above.
Dispose(False)
MyBase.Finalize()
End Sub
#End Region
End Class
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