Comments on: Simple example to demonstrate that String object is immutable

By: Vinay

Vinay — Wed, 08 Feb 2012 11:05:18 +0000

@nishal
What I meant was not against you or something.We all are sayin the same thing.
But my only point was that I kinda off got why “Pradeep” was getting confused.So that example i gave was just to let him know the other side.Its like sometimes the same story told in a different way can clear the air nothing much. Anyways nice tutorial.I have read your other posts as well.Do belive you have a good way to explain technical stuffs keep it on,

By: Manoj

Manoj — Thu, 02 Feb 2012 05:25:02 +0000

thanks all of one……..

By: Raghavender

Raghavender — Thu, 02 Feb 2012 03:22:18 +0000

Both Nischal and Vinay are trying to say the same thing…here’s Nischal’s example with Vinay’s explanation….

String s = “Let’s test”;
//this object(“Let’s test”) is created,say,in memory location: 2012

s.concat(” if the String object is IMMUTABLE”);
//since String objects are immutable, the object in memorylocation:2012 cannot be destroyed, replaced or overridden. Instead s.concat creates a new object(“Let’s test if the String object is IMMUTABLE” ) in the next available memory location,say,2022.

System.out.println(s);
//since s still references the memorylocation:2012, it prints only the first object “Let’s test”.

s = s.concat(” if the String object is IMMUTABLE”);
//Step 2 gets repeated again. s.concat creates a new object(“Let’s test if the String object is IMMUTABLE” ) in the next available memory location:2065. However the additional assignment of s changes the scenario totally. Now s is made to reference the memorylocation:2065.

System.out.println(s);
//Since s points to memorylocation:2065, it will print the object “Let’s test if the String object is IMMUTABLE”. Hence the output!!

The output of the above code will be:

Let’s test

Let’s test if the String object is IMMUTABLE

By: muthu

muthu — Sun, 29 Jan 2012 05:58:15 +0000

Nice clarification…

By: Prashant

Prashant — Tue, 13 Dec 2011 11:15:46 +0000

Its really good and helpful for those who are novice…

By: Deepak

Deepak — Fri, 09 Dec 2011 09:24:33 +0000

Thank you

By: Nischal Shetty

Nischal Shetty — Sat, 26 Nov 2011 09:01:42 +0000

@Vinay I’m sorry I do not agree with that… It’s not security that needed String to be immutable….

Strings were made immutable because at any given point multiple variables can refer to the same object… It would lead to inconsistencies if the objects could be changed.

By: ravi

ravi — Fri, 25 Nov 2011 05:55:18 +0000

@vinay guru:excellent comment

By: Namrata

Namrata — Mon, 24 Oct 2011 18:14:20 +0000

Indeed very helpful !

By: Mohan

Mohan — Fri, 02 Sep 2011 09:58:47 +0000

Nice tutorial..
Thanks a lot.