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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