How do you easily make a copy of an arraylist?
If you do:
arrayList2 = arrayList1
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
I want to create a copy of the arrayList, which I can do looping through the
arrayList1 and adding to arrayList2, but is there an easier way to do this?
Thanks,
Tom 5 2472
Apparently, there are 2 methods: Clone and CopyTo.
What is the difference between the 2?
Clone is supposed to do a "shallow copy"? What is that and why is it
different than CopyTo?
Thanks,
Tom
"tshad" <ts**********@f tsolutions.comw rote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
How do you easily make a copy of an arraylist?
If you do:
arrayList2 = arrayList1
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
I want to create a copy of the arrayList, which I can do looping through
the arrayList1 and adding to arrayList2, but is there an easier way to do
this?
Thanks,
Tom
Since Mr. Balena says it better than me....
<copyrighted_ma terial>
"The Clone method can create either a shallow copy or a deep copy of
the object. A shallow copy creates only a copy of the object in
question; it doesn't make copies of secondary objects referenced by
it." - From Francesco Balena's book "Programmin g Microsoft Visual Basic
..NET"
</copyrighted_mat erial>
Thanks,
Seth Rowe
tshad wrote:
Apparently, there are 2 methods: Clone and CopyTo.
What is the difference between the 2?
Clone is supposed to do a "shallow copy"? What is that and why is it
different than CopyTo?
Thanks,
Tom
"tshad" <ts**********@f tsolutions.comw rote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
How do you easily make a copy of an arraylist?
If you do:
arrayList2 = arrayList1
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
I want to create a copy of the arrayList, which I can do looping through
the arrayList1 and adding to arrayList2, but is there an easier way to do
this?
Thanks,
Tom
CopyTo inserts a copy of the elements in an array into a second array. Once
copied the elements in both arrays are separte but equal.
Heres some code that demonstrates CopyTo in acton:
' Instantiate and intialize the values of a String array named array1.
Dim array1(2) As String
array1 = {"bread", "soup", "beans"}
' Show the values of array1.
For i As Integer = 0 To array1.GetUpper Bound(0)
MessageBox.Show (array1(i).ToSt ring)
Next
' Instantiate a String array named array2.
Dim array2(2) As String
' Copy the elements of array1 to array2.
array1.CopyTo(a rray2, 0)
' Change the first element of array1.
array1(0) = "Was bread, now desert"
' Display the values of array1 and array 2 to show
' they are two separate arrays.
For i As Integer = 0 To array2.GetUpper Bound(0)
MessageBox.Show ("Array1's element " & i.ToString & " contains '"
& _
array1(i).ToStr ing & "' // Array2's element " & i.ToString & "
contains '" & _
array2(i).ToStr ing & "'")
Next
--
Mike McIntyre http://www.getdotnetcode.com
"rowe_newsgroup s" wrote:
Since Mr. Balena says it better than me....
<copyrighted_ma terial>
"The Clone method can create either a shallow copy or a deep copy of
the object. A shallow copy creates only a copy of the object in
question; it doesn't make copies of secondary objects referenced by
it." - From Francesco Balena's book "Programmin g Microsoft Visual Basic
..NET"
</copyrighted_mat erial>
Thanks,
Seth Rowe
tshad wrote:
Apparently, there are 2 methods: Clone and CopyTo.
What is the difference between the 2?
Clone is supposed to do a "shallow copy"? What is that and why is it
different than CopyTo?
Thanks,
Tom
"tshad" <ts**********@f tsolutions.comw rote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..
How do you easily make a copy of an arraylist?
>
If you do:
>
arrayList2 = arrayList1
>
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
>
I want to create a copy of the arrayList, which I can do looping through
the arrayList1 and adding to arrayList2, but is there an easier way to do
this?
>
Thanks,
>
Tom
>
Seth,
Isn't that a great book? I read it cover to cover.
Have you seen his other one, on Standard Practices?
It has a lot of neat tricks and helpful information
in it, too.
Robin S.
"rowe_newsgroup s" <ro********@yah oo.comwrote in message
news:11******** **************@ k70g2000cwa.goo glegroups.com.. .
Since Mr. Balena says it better than me....
<copyrighted_ma terial>
"The Clone method can create either a shallow copy or a deep copy of
the object. A shallow copy creates only a copy of the object in
question; it doesn't make copies of secondary objects referenced by
it." - From Francesco Balena's book "Programmin g Microsoft Visual Basic
.NET"
</copyrighted_mat erial>
Thanks,
Seth Rowe
tshad wrote:
>Apparently, there are 2 methods: Clone and CopyTo.
What is the difference between the 2?
Clone is supposed to do a "shallow copy"? What is that and why is it different than CopyTo?
Thanks,
Tom
"tshad" <ts**********@f tsolutions.comw rote in message news:%2******* *********@TK2MS FTNGP02.phx.gbl ...
How do you easily make a copy of an arraylist?
If you do:
arrayList2 = arrayList1
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
I want to create a copy of the arrayList, which I can do looping
through
the arrayList1 and adding to arrayList2, but is there an easier way to
do
this?
Thanks,
Tom
As mr. Balena wrote it as you told, than he made in my idea a mistake. The
clone method can only make a shallow copy. http://msdn2.microsoft.com/en-us/lib...ist.clone.aspx
To do a deep copy (complete) in the case of the arraylist without needing an
fixed lenght array than you need to serialize and deserialize it. http://www.vb-tips.com/dbPages.aspx?...c-61641f5c8d9d
I hope this helps,
Cor
"rowe_newsgroup s" <ro********@yah oo.comschreef in bericht
news:11******** **************@ k70g2000cwa.goo glegroups.com.. .
Since Mr. Balena says it better than me....
<copyrighted_ma terial>
"The Clone method can create either a shallow copy or a deep copy of
the object. A shallow copy creates only a copy of the object in
question; it doesn't make copies of secondary objects referenced by
it." - From Francesco Balena's book "Programmin g Microsoft Visual Basic
.NET"
</copyrighted_mat erial>
Thanks,
Seth Rowe
tshad wrote:
>Apparently, there are 2 methods: Clone and CopyTo.
What is the difference between the 2?
Clone is supposed to do a "shallow copy"? What is that and why is it different than CopyTo?
Thanks,
Tom
"tshad" <ts**********@f tsolutions.comw rote in message news:%2******* *********@TK2MS FTNGP02.phx.gbl ...
How do you easily make a copy of an arraylist?
If you do:
arrayList2 = arrayList1
You get a pointer so that if you clear arrayList2 (arrayList2.Cle ar) -
arrayList1 is also cleared.
I want to create a copy of the arrayList, which I can do looping
through
the arrayList1 and adding to arrayList2, but is there an easier way to
do
this?
Thanks,
Tom This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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