Properly chastised, (;-), I went ahead and tested several things in a trivial
extension of Kevin's Test class and after some reading concluded that i was indeed
wrong, and Kevin was indeed right. Apparantly the fact that String is an "immutable"
class is the underlying reason for the fact that a putValue is neccessary for String
objects, but, not needed for say, StringBuffer objects or Vector objects or Array
objects (or probably most anything else?). So I guess the fact that it is a String is
sort of special. Hopefully i am not too far off..?
Geeta
Kevin Mukhar wrote:
> Geeta Ramani wrote:
> >
> > Hmm, really? I thought that since String is not a primitive data type, when you
> > pass a String to a variable, you are passing a reference to that String obect,
> > (and it is not passed by value)..? So my guess would have been that doing a
> > "putValue" wouldnt have been necessary.. Of course it should easy enough to
> > check..
>
> And if you had checked it before leaping to reply, you would have
> found...
>
> h.get("myInfo") is [this is string 1]
> myInfoB is [This is an entirely different string]
>
> ------------------ test code ------------------------------
> import java.util.*;
>
> public class Test {
> public static void main(String[] args) {
> Hashtable h = new Hashtable();
> String myInfo = "this is string 1";
> h.put("myInfo", myInfo);
>
> //simulate servlet b with a different myInfo variable
> String myInfoB = (String) h.get("myInfo");
> myInfoB = "This is an entirely different string";
>
> System.out.println("h.get(\"myInfo\") is [" + h.get("myInfo") +
> "]");
> System.out.println("myInfoB is [" + myInfoB + "]");
> }
> }
> ------------------ test code ------------------------------
>
> You are partly right. A reference to the string is passed to the session
> object. When servlet B gets the string from the session, it is really
> getting a reference to the string. That reference is assigned to some
> variable. If a new reference is assigned to that variable, the reference
> inside the session object is unchanged-- it still points to the original
> string object. Assigning a new reference (of ANY type) to a new variable
> does not change the references held by other variables.
>
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