1. Plz anyone tell me "Is Strings immutable"?
for ex:String str1 = "india"; // (1)
str1 = str1 + "is gr8";//(2)
S.O.P(str1);// prints "india is gr8" (3)
If strings r immutable, how can its value b changed, if u says that at (2) string object ref str1 is referring to different object, then how to retrive original string object value "india" after concatenation,which is at (1).
*sigh*
Google.
The string objects don't change. New String objects are created and the variable str1 will reference the newly created String with a different content.
Edit:
As to the second part: If you don't hold a reference to the original String object then it's lost. There's no way for you to get back to it.
> 1. Plz anyone tell me "Is Strings immutable"?
> for ex:String str1 = "india";
>// (1)
> r1 + "is gr8";//(2)
> S.O.P(str1);// prints "india is
> gr8" (3)
>
> If strings r immutable, how can its value
> b changed,
It's not. The value of the reference is changed so that it points to a different String object. This is always what happens when you assign to a reference variable (a non-primitive) in Java.
> If strings r immutable, how can its value
> b changed, if u says that at (2) string object ref
> str1 is referring to different object, then how to
> retrive original string object value "india" after
> concatenation,which is at (1).
String str1 = "india";
String str2 = str1 + "is gr8";
You now still have a reference to the original string.
