Diagramme de la classe Tcompte - Billard Club Saint

1-8 Exemple d’implémentation et d’utilisation d’une classe sous VB.net
Diagramme de la classe Tcompte
TCOMPTE
- Numéro
- nom
- solde
- telephone
+ Créer()
+ Créditer()
+ Debiter()
+ Afficher()
Ecriture de la classe Tcompte sous VB.net
Public Class Tcompte
‘ LES ATTRIBUTS
Private sNumero As Integer
Private sNom As String
Private sSolde As Single
Private sTelephone As String
‘ LES ACCESSEURS
Public ReadOnly Property Numero() As Integer
Get
Numero = sNumero
End Get
End Property
Public ReadOnly Property Nom() As String
Get
Nom = sNom
End Get
End Property
Public ReadOnly Property Solde() As Single
Get
Solde = sSolde
End Get
End Property
Public Property Telephone() As String
Get
Telephone = sTelephone
End Get
Set(ByVal Value As String)
sTelephone = Value
End Set
End Property
‘ LE CONSTRUCTEUR
Public Sub New(ByVal UnNumero As Integer, ByVal UnNom As String, ByVal
UnTelephone As String)
sNumero = UnNumero
sNom = UnNom
Telephone = UnTelephone
sSolde = 0
End Sub
‘LES METHODES
Public Sub Crediter(ByVal UnMontant As Integer)
sSolde = sSolde + UnMontant
End Sub
Public Sub Debiter(ByVal UnMontant As Integer)
sSolde = sSolde - UnMontant
End Sub
Public Sub Afficher()
Dim msg, titre As String
Dim style As Integer
msg = Str(Numero) + " " + Nom + " : " + Str(Solde) + "
Telephone
style = MsgBoxStyle.OKOnly
titre = "Gestion de compte"
MsgBox(msg, style, titre)
End Sub
End Class
tél : " +
Exemple d’utilisation d’objets de la classe Tcompte dans un projet VB.net
Code associé à la classe Form1
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Code généré par le Concepteur Windows Form "
Public Sub New()
MyBase.New()
'Cet appel est requis par le Concepteur Windows Form.
InitializeComponent()
'Ajoutez une initialisation quelconque après l'appel
InitializeComponent()
End Sub
'La méthode substituée Dispose du formulaire pour nettoyer la liste des
composants.
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
'Requis par le Concepteur Windows Form
Private components As System.ComponentModel.IContainer
'REMARQUE : la procédure suivante est requise par le Concepteur Windows
Form
'Elle peut être modifiée en utilisant le Concepteur Windows Form.
'Ne la modifiez pas en utilisant l'éditeur de code.
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents Button2 As System.Windows.Forms.Button
Friend WithEvents Button3 As System.Windows.Forms.Button
Friend WithEvents Button4 As System.Windows.Forms.Button
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents Button5 As System.Windows.Forms.Button
Friend WithEvents Button6 As System.Windows.Forms.Button
Friend WithEvents Button7 As System.Windows.Forms.Button
Friend WithEvents Button8 As System.Windows.Forms.Button
Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
<System.Diagnostics.DebuggerStepThrough()> Private Sub
InitializeComponent()
Me.Button1 = New System.Windows.Forms.Button
Me.Button2 = New System.Windows.Forms.Button
Me.Button3 = New System.Windows.Forms.Button
Me.Button4 = New System.Windows.Forms.Button
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.Button5 = New System.Windows.Forms.Button
Me.Button6 = New System.Windows.Forms.Button
Me.Button7 = New System.Windows.Forms.Button
Me.Button8 = New System.Windows.Forms.Button
Me.TextBox2 = New System.Windows.Forms.TextBox
Me.SuspendLayout()
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(16, 32)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 0
Me.Button1.Text = "Créer"
'
'Button2
'
Me.Button2.Location = New System.Drawing.Point(16, 64)
Me.Button2.Name = "Button2"
Me.Button2.TabIndex = 1
Me.Button2.Text = "Créditer"
'
'Button3
'
Me.Button3.Location = New System.Drawing.Point(16, 96)
Me.Button3.Name = "Button3"
Me.Button3.TabIndex = 2
Me.Button3.Text = "Débiter"
'
'Button4
'
Me.Button4.Location = New System.Drawing.Point(16, 128)
Me.Button4.Name = "Button4"
Me.Button4.TabIndex = 3
Me.Button4.Text = "Afficher"
'
'TextBox1
'
Me.TextBox1.Location = New System.Drawing.Point(136, 64)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(88, 20)
Me.TextBox1.TabIndex = 4
Me.TextBox1.Text = ""
'
'Button5
'
Me.Button5.Location = New System.Drawing.Point(240, 72)
Me.Button5.Name = "Button5"
Me.Button5.Size = New System.Drawing.Size(32, 24)
Me.Button5.TabIndex = 5
Me.Button5.Text = "Ok"
'
'Button6
'
Me.Button6.Location = New System.Drawing.Point(248, 72)
Me.Button6.Name = "Button6"
Me.Button6.Size = New System.Drawing.Size(32, 23)
Me.Button6.TabIndex = 6
Me.Button6.Text = "Ok"
'
'Button7
'
Me.Button7.Location = New System.Drawing.Point(16, 160)
Me.Button7.Name = "Button7"
Me.Button7.TabIndex = 7
Me.Button7.Text = "Modifier"
'
'Button8
'
Me.Button8.Location = New System.Drawing.Point(240, 72)
Me.Button8.Name = "Button8"
Me.Button8.Size = New System.Drawing.Size(40, 23)
Me.Button8.TabIndex = 8
Me.Button8.Text = "Ok"
'
'TextBox2
'
Me.TextBox2.Location = New System.Drawing.Point(136, 104)
Me.TextBox2.Name = "TextBox2"
Me.TextBox2.Size = New System.Drawing.Size(88, 20)
Me.TextBox2.TabIndex = 9
Me.TextBox2.Text = ""
Me.TextBox2.Visible = False
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 230)
Me.Controls.Add(Me.TextBox2)
Me.Controls.Add(Me.Button8)
Me.Controls.Add(Me.Button7)
Me.Controls.Add(Me.Button6)
Me.Controls.Add(Me.Button5)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Button4)
Me.Controls.Add(Me.Button3)
Me.Controls.Add(Me.Button2)
Me.Controls.Add(Me.Button1)
Me.Name = "Form1"
Me.Text = "Gestion de compte"
Me.ResumeLayout(False)
End Sub
#End Region
'Déclaration d' un objet compte
Dim c1 As Tcompte
' Créer
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
c1 = New Tcompte(1, "Karting", "04 22 11 77 00")
End Sub
'Créditer
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click
TextBox1.Text = ""
TextBox1.Visible = True
Button5.Visible = True
TextBox1.Focus()
End Sub
'Ok créditer
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button5.Click
c1.Crediter(Val(TextBox1.Text))
TextBox1.Visible = False
Button5.Visible = False
End Sub
'afficher
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button4.Click
c1.Afficher()
End Sub
'Débiter
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button3.Click
TextBox1.Text = ""
TextBox1.Visible = True
Button6.Visible = True
TextBox1.Focus()
End Sub
'Ok débiter
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button6.Click
c1.Debiter(Val(TextBox1.Text))
TextBox1.Visible = False
Button6.Visible = False
End Sub
'activation de la fiche
Private Sub Form1_Activated(ByVal sender As Object, ByVal e As
System.EventArgs) Handles MyBase.Activated
TextBox1.Visible = False
TextBox2.Visible = False
Button5.Visible = False
Button6.Visible = False
Button8.Visible = False
End Sub
' modifier
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button7.Click
TextBox1.Text = c1.Telephone
TextBox1.Visible = True
TextBox2.Visible = True
TextBox2.Focus()
Button8.Visible = True
End Sub
' Ok modifier
Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button8.Click
If textbox2.text <> "" Then
c1.Telephone = textbox2.text
TextBox1.Visible = False
TextBox2.Visible = False
TextBox2.Text = ""
Button8.Visible = False
Else : MsgBox(" le champ téléphone est vide ")
End If
End Sub
End Class
Destruction des objets sous VB.net :
Le garbage collector (également appelé ramasse-miettes) du .NET Framework manage l'allocation et la libération de mémoire dans votre
application. Chaque fois que vous utilisez l'opérateur new pour créer un objet, le runtime alloue de la mémoire pour l'objet à partir du tas
managé. Tant que de l'espace d'adressage est disponible dans le tas managé, le runtime continue à allouer de l'espace pour les nouveaux
objets. Toutefois, la mémoire n'est pas infinie. Le garbage collector doit finir par effectuer un garbage collection afin de libérer de la
mémoire. Le moteur d'optimisation du garbage collector détermine le meilleur moment pour effectuer un garbage collection en fonction des
allocations en cours. Lorsque le garbage collector effectue un garbage collection, il recherche les objets figurant dans le tas managé qui ne
sont plus utilisés par l'application et effectue les opérations nécessaires pour récupérer leur mémoire.