What are constructors and destructor?

Question

hi friends What are the constructor and destructor? please explain with examples.. Thanks...

Satyapriya Nayak · Answer

Welcome Dibya, Below i explain constructor and destructor with examples. Constructor is special method, which controls over the initialization of object. It is used for variable initialization. When we create an object of the class then the constructor within the class is automatically called. It is used with the keyword new before sub in vb.net Ex Public Class Form1 Inherits System.Windows.Forms.Form Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a As New raj a.kunal() Dim b As New rahul("pintu") Dim c As New rahul(10, 10) End Sub Public Class raj Public Sub New() MsgBox("Hello raj constructor") End Sub Public Sub kunal() MsgBox("Hello kunal") End Sub End Class Public Class rahul Public Sub New(ByVal x As String) MsgBox("Hello" & x) End Sub Public Sub New(ByVal x As Integer, ByVal y As Integer) MsgBox(x + y) End Sub End Class End Class Destructor release the memory of the object created by the constructor. It is of two types dispose and finalize .In dispose we have to intentionally call dispose destructor. But in finalize it is called automatically when the last reference of the object is released Ex Public Class Form1 Inherits System.Windows.Forms.Form Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim a As New raj a.dispose() End Sub Public Class raj Public Sub New() MsgBox("Instant constructor of raj") End Sub Shared Sub New() MsgBox("Shared constructor of raj") End Sub Public Overloads Sub dispose() MsgBox("Dispose destructor of raj") End Sub Protected Overrides Sub finalize() MsgBox("Finalize destructor of raj") End Sub End Class End Class Thanks If this post helps you mark it as answer

What are constructors and destructor?

Insert Link

Embed YouTube Video

Table Options

Insert Image

Answers (1)