ArrayList inside ArrayList clone problem

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#693

From: Pujo Aji
Date: Mon, 01 Nov 2004 07:21

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I would like to make a program which can handle ArrayList in ArrayList so it 
is able to simulate 2D dynamic Array, it is ok but I have a problem when I 
would like to do shallow copy in my ArrayList inside ArrayList.
Here is my program:
ArrayList AA = new ArrayList();
ArrayList temp = new ArrayList();
temp.Add("hello");
AA.Add((ArrayList)temp.Clone());
Console.WriteLine(((ArrayList)AA[0])[0]);//will show "hello"

ArrayList newAA = new ArrayList();
newAA = (ArrayList)AA.Clone();
Console.WriteLine(((ArrayList)newAA[0])[0]);//will show "hello"

//now change the newAA
((ArrayList)(newAA[0]))[0] = "world";
Console.WriteLine(((ArrayList)newAA[0])[0]);//will show "world"

//AA should not change into "world" also, but it is changed
Console.WriteLine(((ArrayList)AA[0])[0]);//will show "world"

Anyone can help?

Sincerely Yours,
Pujo

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