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New Message on BDOTNET
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From: Roark
Message 4 in Discussion
The example u have tried out is a perfect example of shallow copy. What has happened
is that testClone, o1 and o2 all refer to the same object. So changing any one of them
will result in manupulating the same object. This is because u have clonned the
arraylist and not TestClone. I made a goof-up in the first reply i gave. The string
class is immutable and any changes made to it will result in a new string bieng
returned. If u substitute the Stringbuilder for the string class in the explanation i
gave earlier it should be fine. Now try this: add the integer and the string
directly to the arrylist. also add a string builder. Then clone the arrylist. now if u
modify the stringBuilder object from any of the arraylists or the original
StringBuilder reference, the change will be reflected everywhere. But for the string
and the interger this is not true.
ArrayList arr = new ArrayList();
int x = 10;
string str = "abc";
StringBuilder SB = new StringBuilder("abc");
arr.Add(x);
arr.Add(str);
arr.Add(SB);
ArrayList arr2 = (ArrayList) arr.Clone();
arr[0] = (int)arr[0]+9;
((string)arr[1]).Insert(0,"AppendToString");
((StringBuilder)arr[2]).Insert(0,"AppendToBuilder");
//or
//((StringBuilder)arr2[2]).Insert(0,"AppendToBuilder");
//or
//SB.Insert(0,"AppendToBuilder");
//only changes made to the stringbuilder object get reflected in both places
//the changes made to the string do not as it is an immutable object
Console.WriteLine(""+arr[0]+arr[1]+arr[2]);
Console.WriteLine(""+arr2[0]+arr2[1]+arr2[2]);
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