类的继承与封装应用

Imports System.ComponentModel
Imports System.Drawing
Imports System.Windows.Forms
Class person
    Private name As String
    Private age As Integer
    Private Sub modifyAge(ByVal a As Integer)
        age = a
    End Sub
    Public Sub New(ByVal na As String, ByVal a As Integer)
        name = na
        age = a
    End Sub
    Public Sub modify(ByVal na As String, ByVal a As Integer)
        name = na
        modifyAge(a)
    End Sub
    Public Sub show()
        MessageBox.Show("Name:" + name + "  Age:" + Str(age))
    End Sub

End Class
Class teacher
   
End Class
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Name = "Form1"
        Me.Text = "Form1"

    End Sub

#End Region

    Private Sub Form1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Click
        Dim p1 As New person("icefox", 38)
        p1.show()
        p1.modify("neu2000", 37)
        p1.show()

    End Sub
End Class