VB.NET 物件導向 Class.3 (建構子+類別陣列+繼承)

建構子：
-----------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim car1 As New Car

    End Sub
End Class
==============================================

Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Double

    //建構子
    Sub New()
        pNum = 2266
        cName = "Masalaty"
        gas = 12000
    End Sub

End Class

-----------------------------------------------------------------------------

類別陣列：

-----------------------------------------------------------------------------

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim cars(2) As Car
        Dim pN As Integer
        Dim cN As String
        Dim g As Double
        Dim i As Integer
-----------------------------------------------------------------------------
        For i = 1 To cars.Length

            //分別New出來
            cars(i - 1) = New Car

            MessageBox.Show("請輸入第 " & i & " 輛車資料")
            pN = InputBox("輸入車牌")
            cN = InputBox("輸入車款")
            g = InputBox("輸入排氣量")
            cars(i - 1).setData(pN, cN, g)
        Next
-----------------------------------------------------------------------------
        For i = 1 To cars.Length
            cars(i - 1).showData()
        Next

    End Sub
End Class
==============================================
Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Double
-----------------------------------------------------------------------------
    Sub setData(pN, cN, g)
        pNum = pN
        cName = cN
        gas = g
    End Sub
-----------------------------------------------------------------------------
    Sub showData()
        MessageBox.Show("車牌號碼：" & pNum & vbCr &
                        "車款：" & cName & vbCr &
                        "排氣量：" & gas)
    End Sub
End Class

-----------------------------------------------------------------------------

繼承：
-----------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim car1 As New Car
        Dim pN As Integer
        Dim cN As String
        Dim g As Double
-----------------------------------------------------------------------------
        MessageBox.Show("請輸入汽車資料")
        pN = InputBox("輸入車牌")
        cN = InputBox("輸入車款")
        g = InputBox("輸入排氣量")
        car1.setData(pN, cN, g)
        car1.showData()
-----------------------------------------------------------------------------
        Dim racCar1 As New racingCar
        MessageBox.Show("請輸入賽車資料")
        pN = InputBox("輸入車牌")
        cN = InputBox("輸入車款")
        g = InputBox("輸入排氣量")

        '即使類別中沒有任何方法仍能使用父類別的方法
        racCar1.setData(pN, cN, g)
        racCar1.showData()
-----------------------------------------------------------------------------
        Dim racCar2 As New racingCar
        Dim wind As Integer
        MessageBox.Show("請輸入賽車資料")
        pN = InputBox("輸入車牌")
        cN = InputBox("輸入車款")
        g = InputBox("輸入排氣量")
        wind = InputBox("輸入風阻係數")

        racCar2.setData(pN, cN, g)
        racCar2.setWind(wind)
        racCar2.showData()
        racCar2.showInfo()

    End Sub
End Class
==============================================

Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Double
-----------------------------------------------------------------------------
    Sub setData(pN, cN, g)
        pNum = pN
        cName = cN
        gas = g
    End Sub
-----------------------------------------------------------------------------
    Sub showData()
        MessageBox.Show("車牌號碼：" & pNum & vbCr &
                        "車款：" & cName & vbCr &
                        "排氣量：" & gas)
    End Sub

End Class
==============================================
Class racingCar
    Inherits Car              //一定要換行
    Dim wind As Integer
    Sub setWind(w)
        wind = w
    End Sub
-----------------------------------------------------------------------------
    Sub showInfo()
        MessageBox.Show("風阻係數為：" & wind)
    End Sub
End Class
-----------------------------------------------------------------------------

VB.NET 物件導向 Class.2 (類別安全性+多型+迴圈)

類別基本練習：類別安全性

----------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim car1 As New Car
        Dim pN As Integer = InputBox("輸入車牌")
        Dim cN As String = InputBox("輸入車款")
        Dim g As Double = InputBox("輸入排氣量")

        If car1.setData(pN, cN, g) = True Then       //先帶入值檢驗是否合法
            car1.Car(pN, cN, g)                                  //合法就帶入值
            car1.show()                                               //並秀出來
        Else
            MessageBox.Show("輸入錯誤請重新執行")
        End If

    End Sub
End Class
===================================================

Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Integer
----------------------------------------------------------------------------------------
//帶入檢驗合格的值
    Sub Car(pN, cN, g)
        pNum = pN
        cName = cN
        gas = g
    End Sub
----------------------------------------------------------------------------------------
//帶入值檢驗是否合格
    Function setData(pN, cN, g)
        Dim result As Boolean = True
        If g < 0 Then
            result = False
        End If
        Return result
    End Function
----------------------------------------------------------------------------------------
//內呼叫方法
    Sub show()
        ShowData()
    End Sub
----------------------------------------------------------------------------------------
    Private Sub ShowData()
        MessageBox.Show("車牌號碼：" & pNum & vbCr &
                        "車款：" & cName & vbCr &
                        "排氣量：" & gas)
    End Sub
End Class

----------------------------------------------------------------------------------------

多型：
----------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim car1 As New Car
        Dim pN As Integer = InputBox("輸入車牌")
        Dim cN As String = InputBox("輸入車款")
        Dim g As Double = InputBox("輸入排氣量")
----------------------------------------------------------------------------------------
//全部設定
        car1.setData(pN, cN, g)
        car1.showData()
----------------------------------------------------------------------------------------
//只改車牌
        pN = InputBox("輸入車牌")
        car1.setData(pN)
        car1.showData()
----------------------------------------------------------------------------------------
//只改車款&排氣量
        cN = InputBox("輸入車款")
        g = InputBox("輸入排氣量")
        car1.setData(cN, g)
        car1.showData()

    End Sub
End Class
==========================================================

Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Integer
----------------------------------------------------------------------------------------
//方法相同傳入值不同有不同處理方法
    Sub setData(pN)
        pNum = pN
    End Sub
----------------------------------------------------------------------------------------
    Sub setData(cN, g)
        cName = cN
        gas = g
    End Sub
----------------------------------------------------------------------------------------
    Sub setData(pN, cN, g)
        pNum = pN
        cName = cN
        gas = g
    End Sub
----------------------------------------------------------------------------------------
    Sub showData()
        MessageBox.Show("車牌號碼：" & pNum & vbCr &
                        "車款：" & cName & vbCr &
                        "排氣量：" & gas)
    End Sub

End Class

----------------------------------------------------------------------------------------

迴圈：
----------------------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim car1 As New Car
        Dim pN As Integer
        Dim cN As String
        Dim g As Double
        Dim i As Integer
----------------------------------------------------------------------------------------
//就只是迴圈
        For i = 1 To 5
            MessageBox.Show("請輸入第 " & i & " 輛車資料")
            pN = InputBox("輸入車牌")
            cN = InputBox("輸入車款")
            g = InputBox("輸入排氣量")
            If g < 0 Then
                i -= 1
                Continue For
            Else
                car1.setData(pN, cN, g)
                car1.showData()
            End If
        Next
----------------------------------------------------------------------------------------
    End Sub
End Class
====================================================

Class Car
    Dim pNum As Integer
    Dim cName As String
    Dim gas As Double
----------------------------------------------------------------------------------------
    Sub setData(pN, cN, g)
        pNum = pN
        cName = cN
        gas = g
    End Sub
----------------------------------------------------------------------------------------
    Sub showData()
        MessageBox.Show("車牌號碼：" & pNum & vbCr &
                        "車款：" & cName & vbCr &
                        "排氣量：" & gas)
    End Sub

End Class

----------------------------------------------------------------------------------------

VB.NET Class.7 (登入系統 + 物件導向 Class.1)

練習一：登入系統
---------------------------------------------------------------------------------
登入成功畫面

登入失敗畫面

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Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        //預設可登入帳號密碼

        Dim account As String = "ABC"

        Dim password As String = "abc123"

        Dim userAccount As String

        Dim userPassword As String

        

        //分別取出 TextBox 中的值並去除前後多餘的空格

        userAccount = TextBox1.Text.Trim

        userPassword = TextBox2.Text.Trim

        //分別把取出的值轉成需要的大小寫

        userAccount = userAccount.ToUpper

        userPassword = userPassword.ToLower

        //判斷帳號密碼是否相同

        If userAccount = account And userPassword = password Then

            MessageBox.Show("歡迎進入本系統")

        Else

            Label3.Text = "帳號或密碼輸入錯誤，請重新輸入"

        End If

    End Sub

End Class

========================================================

物件導向 Class.1

---------------------------------------------------------------------------------
執行結果

---------------------------------------------------------------------------------

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim car1 As New Car

        car1.pNum = 9999

        car1.cName = "Toyota"

        car1.ccolor = "Red"

        car1.gas = 3000.0

        Label1.Text = car1.pNum & vbCr & car1.cName & vbCr & car1.ccolor & vbCr & car1.gas

        car1.showData()

    End Sub

End Class

---------------------------------------------------------------------------------
 //新類別

Class Car

 //新類別變數

    Public pNum As Integer

    Public cName As String

    Public ccolor As String

    Public gas As Double

 //新類別方法

    Public Sub showData()

        MessageBox.Show(pNum & vbCr & cName & vbCr & ccolor & vbCr & gas)

    End Sub

End

---------------------------------------------------------------------------------

VB.NET Class.6 (亂數)

練習一：取10個亂數印出並顯示大於60的個數

-----------------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------------------

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Label1.Text = ""

        Dim a(9) As Double

        Dim i As Integer

        Dim x As Integer = 0

        Randomize()              //有這行才能夠使 Rnd()真正實現亂數

        For i = 0 To a.Length - 1

            a(i) = Math.Floor(Rnd() * 100) + 1                  //Math.Floor() 為絕對值取法
                                                                                         //Rnd() 為亂數取值 0 ~ 1 之間的小數

            If a(i) >= 60 Then

                x += 1

            End If

        Next

        For i = 0 To a.Length - 1

            Label1.Text = Label1.Text & i + 1 & ". " & a(i) & vbCr

        Next

        Label1.Text = Label1.Text & "及格的有 " & x & " 個"

    End Sub

End Class

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練習二：改變程式預設屬性
-----------------------------------------------------------------------------------------------------------------

1. 滑鼠在紅色區域內點兩下

2. 進入下列畫面後右上角選擇 "Activated"

3. 接著在以下出現的 "Form1_Activated" 中撰寫程式就能在程式起始時完成屬性設定

-----------------------------------------------------------------------------------------------------------------

Private Sub Form1_Activated(sender As Object, e As System.EventArgs) Handles Me.Activated

        Label1.Text = ""

        Label1.ForeColor = Color.Red

    End Sub

-----------------------------------------------------------------------------------------------------------------

4. 結果

VB.NET Class.5 (陣列)

練習一：

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim a(4) As Char                      //宣告方法代表 a(0) 到 a(4) 共五個變數
        Dim b(0 To 4) As Char             //另一種宣告方法 也是五個變數
        Dim i As Integer

        For i = 0 To a.Length - 1             //a 的總長度 -1 才會跑五個變數 0 ~ 4
            a(i) = InputBox("請輸入第 " & i & "個字元")
        Next

        Dim s As String
        For i = 0 To a.Length - 1
            s = s & a(i)                               //字元組合方法
            MessageBox.Show(s)
        Next

    End Sub
End Class

------------------------------------------------------------------------------------------------

練習二：

------------------------------------------------------------------------------------------------
Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim a(9) As Integer
        Dim i As Integer

        For i = 0 To a.Length - 1
            a(i) = InputBox("請輸入第 " & i + 1 & "位同學成績")
        Next

        Dim total As Integer = 0
        For i = 0 To a.Length - 1
            total = total + a(i)
        Next

        MessageBox.Show("總分為：" & total & "分" & vbCr & "平均為：" & total / 10 & "分")

    End Sub
End Class

------------------------------------------------------------------------------------------------

練習三：輸入10位同學成績秀在Label上

------------------------------------------------------------------------------------------------

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Label1.Text = ""
        Dim a(9) As Integer
        Dim i As Integer

        For i = 0 To a.Length - 1
            a(i) = InputBox("請輸入第 " & i + 1 & "位同學成績")
        Next

        Dim total As Integer = 0
        For i = 0 To a.Length - 1
            Label1.Text = Label1.Text & "第" & i & "位同學成績為 " & a(i) & "分" & vbCr
            total = total + a(i)
        Next

        Label1.Text += "================" & vbCr
        Label1.Text += "總分為：" & total & "分" & vbCr & "平均為：" & total / 10 & "分"
        'MessageBox.Show("總分為：" & total & "分" & vbCr & "平均為：" & total / 10 & "分")
    End Sub
End Class

------------------------------------------------------------------------------------------------

練習四：VB 的 Switch Case 寫法

------------------------------------------------------------------------------------------------

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim num As Integer

        num = TextBox1.Text

        Select Case num

            Case 1

                Label1.Text = "1 is first"

            Case 2

                Label1.Text = "2 is second"

            Case 3

                Label1.Text = "3 is third"

            Case 4

                Label1.Text = "4 is fourth"

            Case 5

                Label1.Text = "5 is fifth"

            Case Else

                Label1.Text = "請別來亂謝謝!!"

        End Select

    End Sub

End Class

VB.NET Class.4 (函數)

函數、傳入值：

-----------------------------------------------------------------------------------------------------------------

<pre class="prettyprint">

Public Class Form1

    Private Sub slogan()

        MessageBox.Show("你好嗎?")

        MessageBox.Show("我很好!!")

    End Sub

</pre>

Public Class Form1
    Private Sub slogan()
        MessageBox.Show("你好嗎?")
        MessageBox.Show("我很好!!")
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub cal(ByVal x, ByVal y)
        Label1.Text = x + y
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim x As Integer
        Dim y As Integer
        x = 5
        y = 3
        slogan()
        cal(x, y)
    End Sub
End Class

-----------------------------------------------------------------------------------------------------------------

函數、回傳值：

-----------------------------------------------------------------------------------------------------------------
Public Class Form1
    Private Sub slogan()
        MessageBox.Show("你好嗎?")
        MessageBox.Show("我很好!!")
    End Sub
-----------------------------------------------------------------------------------------------------------------
    Private Function cal(ByVal x, ByVal y)
        Dim result As Integer
        result = x * y
        Return result
    End Function
-----------------------------------------------------------------------------------------------------------------
    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        slogan()

        Dim x As Integer
        Dim y As Integer
        x = InputBox("輸入X值")
        y = InputBox("輸入Y值")
        Dim result As Integer = cal(x, y)
        MessageBox.Show("結果值為" & result)
        Label1.Text = result
    End Sub
End Class

-----------------------------------------------------------------------------------------------------------------

練習一(輸入一個值算出有幾個因數)：

-----------------------------------------------------------------------------------------------------------------

Public Class Form1

    Public Function countfac(x)

        Dim i As Integer

        Dim number As Integer = 0

        For i = 1 To x

            Dim result As Integer = x Mod i

            If result = 0 Then

                number += 1

            End If

        Next

        Return number

    End Function

-----------------------------------------------------------------------------------------------------------------

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim x As Integer = TextBox1.Text

        Dim result As Integer = countfac(x)

        Label1.Text = "您輸入的值 " & x & " 共有 " & result & " 個因數"

        MessageBox.Show("您輸入的值 " & x & " 共有 " & result & " 個因數")

    End Sub

End Class

-----------------------------------------------------------------------------------------------------------------

VB.NET Class.3 (迴圈)

程式依序按鈕排列...


    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Label1.Text = ""
        Dim i As Integer
        While i <= 10
            Label1.Text = Label1.Text & "WHILE" & i & "次" & vbCr        //vbCr為換行指令
            i += 1
        End While
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        Label1.Text = ""
        Dim i As Integer
        For i = 0 To 10
            Label1.Text = Label1.Text & "FOR" & i & "次" & vbCr             //vbCr為換行指令
        Next
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        For i = 0 To 10
            total += i
        Next
        Label1.Text = "總和 = " & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button4_Click(sender As System.Object, e As System.EventArgs) Handles Button4.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        For i = 0 To 10
            If i Mod 2 = 1 Then
                total += i
            End If
        Next
        Label1.Text = "奇數和 = " & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button5_Click(sender As System.Object, e As System.EventArgs) Handles Button5.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        For i = 0 To 10
            If i Mod 2 = 0 Then
                total += i
            End If
        Next
        Label1.Text = "偶數和 = " & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button6_Click(sender As System.Object, e As System.EventArgs) Handles Button6.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        Do While i <= 10
            total += i
            i += 1
        Loop
        Label1.Text = "前置" & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button7_Click(sender As System.Object, e As System.EventArgs) Handles Button7.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        Do
            total += i
            i += 1
        Loop While i <= 10
        Label1.Text = "後置" & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button8_Click(sender As System.Object, e As System.EventArgs) Handles Button8.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        Do Until i > 10
            total += i
            i += 1
        Loop
        Label1.Text = "前置" & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button9_Click(sender As System.Object, e As System.EventArgs) Handles Button9.Click
        Label1.Text = ""
        Dim i As Integer
        Dim total As Integer = 0
        Do
            total += i
            i += 1
        Loop Until i > 10
        Label1.Text = "後置" & total
    End Sub
-----------------------------------------------------------------------------------------------------------------    Private Sub Button10_Click(sender As System.Object, e As System.EventArgs) Handles Button10.Click
        Dim a As Integer = InputBox("輸入一個數a")
        Dim b As Integer = InputBox("輸入一個數b")
        MessageBox.Show("總合為" & a + b)
    End Sub
End Class

-----------------------------------------------------------------------------------------------------------------

VB.NET Class.2

 

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim hight As Integer
        Dim weight As Integer

        hight = TextBox1.Text                             //TextBox取值功能
        weight = TextBox2.Text

        Dim bmi As Double
        bmi = weight / ((hight * hight) / 10000)
        Label3.Text = "BMI值為：" & bmi            // &功能為串接不同屬性之連接子

    End Sub

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

        Dim score As Integer = TextBox1.Text

        If score > 100 Or score < 0 Then

            MessageBox.Show("輸入錯誤")

        ElseIf score >= 80 Then

            If score >= 90 Then

                MessageBox.Show("頂尖")

            Else

                MessageBox.Show("優秀")

            End If

        ElseIf score >= 60 Then

            If score >= 70 Then

                MessageBox.Show("普通")

            Else

                MessageBox.Show("低空掠過")

            End If

        Else

            If score >= 50 Then

                MessageBox.Show("補考")

            Else

                MessageBox.Show("明年再來")

            End If

        End If

    End Sub

End Class

VB.NET 初體驗

Module Module1

    Sub Main()
        Dim a As Integer              // 宣告整數
        a = 8
        Dim b As Integer = 5       // 直接宣告整數
     
        Console.WriteLine("Welcome")     //有換行
        Console.Write("Visual Basic")       //沒有換行
        Console.WriteLine(a + b)
        Console.WriteLine(a - b)
        Console.WriteLine(a * b)
        Console.WriteLine(a / b)                //直接除法顯示真實浮點值
        Console.WriteLine(a \ b)                //反除法求商
        Console.WriteLine(a Mod b)          //求餘數
        Console.Read()                                //讓Console停下的方法

        Dim c As Double = 88.8                
        Dim d As String = "Coffee"            
        Dim e As Char = "G"                       //只會讀第一個字元
                                                                  ' VB註解專用符號

    End Sub

End Module