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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
      SQL Server 2008 視頻教程 c#入門經典教程 Visual Basic從門到精通視頻教程
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      首頁 > 編程開發 > VBnet >
      • vb.net教程之類的派生與繼承

      • 2015-01-24 13:05 來源:未知
      類的派生與繼承(相關vb.net教程)
      上面mydate類中,如果要增加時、分、秒的處理又該如何呢?此時只需在前面的基礎上增加三個成員m_hour m_minute m_second及其處理程序。這樣便產生一個派生類mydatetime。總的操作步驟為:
      1、在派生類mydatetime中加入語句:inherits mydate,以示派生關系。
      2、同時,派生類的構造函數new()new(y,m,d,h,mi,s)中分別加入mybase.new()mybase.new(y,m,d)
      3、原類的show函數與派生類的show函數前中分別加入:overridableoverrides
      程序見,mydate的派生類mydatetime,程序如下:
      Public Class mydate
          Public m_year, m_month, m_day As Integer
          Public Sub New()
              m_year = Microsoft.VisualBasic.Year(Now)
              m_month = Microsoft.VisualBasic.Month(Now)
              m_day = Microsoft.VisualBasic.Day(Now)
          End Sub
          Public Sub New(ByVal y As Integer, ByVal m As Integer, ByVal d As Integer)
              m_year = y : m_month = m : m_day = d
          End Sub
          Public Overridable Sub show()
                Dim s As String
              s = Str(m_year) + "-" + Str(m_month) + "-" + Str(m_day)
              MsgBox(s, MsgBoxStyle.OkOnly, "日期")
          End Sub
      End Class
      Public Class mydatetime
          Inherits mydate
          Private m_hour, m_minute, m_second
          Public Overrides Sub show()
              Dim s As String
              s = Str(m_year) + "-" + Str(m_month) + "-" + Str(m_day)
              s = s + Str(m_hour) + ":" + Str(m_minute) + ":" + Str(m_second)
              MsgBox(s, MsgBoxStyle.OkOnly, "時間日期")
          End Sub
          Public Sub setsystemtime()
              m_hour = Microsoft.VisualBasic.Hour(Now)
              m_minute = Microsoft.VisualBasic.Minute(Now)
              m_second = Microsoft.VisualBasic.Second(Now)
          End Sub
          Public Sub New()
              MyBase.New()
              setsystemtime()
          End Sub
          Public Sub New(ByVal y As Integer, ByVal m As Integer, ByVal d As Integer, ByVal h As Integer, ByVal mi As Integer, ByVal s As Integer)
              MyBase.New(y, m, d)
              m_hour = h : m_minute = mi : m_second = s
          End Sub
      End Class
      測試類為:
      Public Class Form1
          Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
              Dim a As New mydatetime
              Dim b As New mydatetime(2008, 5, 1, 11, 30, 40)
              a.show()
              b.show()
          End Sub
      End Class
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