Inheritance Question

When you inherit an object into a class, If you don't delcare a constructor, will it use the inherited objects constructor by default?

Code:

---

Public Class clsArrayList
    Inherits ArrayList

    Public Function ReturnTypeList(ByVal inType As Type) As ArrayList

        Dim retList As New ArrayList

        'Return a new list by object type
        For Each o As Object In Me
            If o.GetType Is inType Then retList.Add(o)
        Next

        Return retList

    End Function

End Class

---

Or do I have to add these to use the default conscrutors?

Code:

---

    Public Sub New()
        MyBase.New()
    End Sub

    Public Sub New(ByVal capacity As Integer)
        MyBase.New(capacity)
    End Sub

    Public Sub New(ByVal c As System.Collections.ICollection)
        MyBase.New(c)
    End Sub

---

Next question, I am eventually going to be Serializing this arraylist to a XML file using the XmlSerializer and from what I understand that the ArrayList object you serialize needs to Implement an IColletion interface, An arraylist does this by default, Does my class above still implement the ICollection since it's based off a ArrayList object or do I need to specify that as well?

Thanks

Hinder

Your inherited object gains the constructor and interface(s) of its parent class.

Actually Constructors are the only thing not passed to a derived class. So it would inherit the interface but not the constructors. You can call them as you show but you will need to write that code it is not implied via inheritance.

Nevermind I guess it does inherit and fire the parent classes default constructor but it doesn't inherit any of the non default constructors.

So calling New on your child class will use the New on the parent class the same as:

VB Code:

Public Sub New()
Mybase.New()
End Sub

But the child class will not have the other constructors through inheritance.

VB Code:

Public Class Parent
 
    Public Sub New()
        MsgBox("Showing")
    End Sub
 
    Public Sub New(ByVal msg As String)
        MsgBox(msg)
    End Sub
 
End Class
 
Public Class Child
    Inherits Parent
 
End Class
 
'syntax of use
        Dim c As New Child 'only default constructor is available