Private class fields : Private « Class Module « VB.Net Tutorial

1. VB.Net Tutorial
2. Class Module
3. Private

Module Tester

   Sub Main()
      Dim time As New CTime() ' call CTime constructor

      Console.WriteLine("The initial universal times is: " & _
         time.ToUniversalString() & vbCrLf & _
         "The initial standard time is: " & _
         time.ToStandardString())

      time.SetTime(13, 27, 6) ' set time with valid settings

      Console.WriteLine("Universal time after setTime is: " & _
         time.ToUniversalString() & vbCrLf & _
         "Standard time after setTime is: " & _
         time.ToStandardString())

      time.SetTime(99, 99, 99) ' set time with invalid settings

      Console.WriteLine("Universal time: " & time.ToUniversalString() & _
         vbCrLf & "Standard time: " & time.ToStandardString())

   End Sub 

End Module 



Class CTime
   Inherits Object

   Private mHour As Integer ' 0 - 23
   Private mMinute As Integer ' 0 - 59
   Private mSecond As Integer ' 0 - 59

   Public Sub New()
      SetTime(0, 0, 0)
   End Sub ' New

   Public Sub SetTime(ByVal hourValue As Integer, _
      ByVal minuteValue As Integer, ByVal secondValue As Integer)

      If (hourValue >= 0 AndAlso hourValue < 24) Then
         mHour = hourValue
      Else
         mHour = 0
      End If

      If (minuteValue >= 0 AndAlso minuteValue < 60) Then
         mMinute = minuteValue
      Else
         mMinute = 0
      End If

      If (secondValue >= 0 AndAlso secondValue < 60) Then
         mSecond = secondValue
      Else
         mSecond = 0
      End If

   End Sub ' SetTime

   Public Function ToUniversalString() As String
      Return String.Format("{0}:{1:D2}:{2:D2}", _
         mHour, mMinute, mSecond)
   End Function ' ToUniversalString

   Public Function ToStandardString() As String
      Dim suffix As String = " PM"
      Dim format As String = "{0}:{1:D2}:{2:D2}"
      Dim standardHour As Integer

      If mHour < 12 Then
         suffix = " AM"
      End If

      If (mHour = 12 OrElse mHour = 0) Then
         standardHour = 12
      Else
         standardHour = mHour Mod 12
      End If

      Return String.Format(format, standardHour, mMinute, _
         mSecond) & suffix
   End Function 

End Class

The initial universal times is: 0:00:00
The initial standard time is: 12:00:00 AM
Universal time after setTime is: 13:27:06
Standard time after setTime is: 1:27:06 PM
Universal time: 0:00:00
Standard time: 12:00:00 AM