String Buffer & String

[arun mahajan]

Hi Everybody,

I could remember there was some write up by Cindy on the above two.. could not able to locate on the site. Can somebody help me?

regards,
arun

[Dirk Schreckmann]

Perhaps you'd have some luck using Cindy's member number as one of the search parameters. It's 3498.

[satish sathineni]

Hi,

Object type Comparision

String -->> immutable (Value once assigned cannot be modified)
StringBuffer -->> mutable (Value can be modified).

Performance comparision

Performance wise StringBuffer is better when u compare String with StringBuffer in string manipulation that is
ex:
String str = "Hello";
str = str+"World" ;
sop(str);

StringBuffer sbstr = new StringBuffer("Hello");
sbstr.append("world");
sop(sbstr.toString());

if we look at the above example the major and hidden difference is internally how JVM handles the string manipulation....

when we say str = str+"World";

internally ::

StringBuffer xxx = new StringBuffer(str);
xxx.append("World");
str = xxx.toString();

Now u can make out that internally there is a overhead of converting the String str to StringBuffer and applying append method on that and finally it is assigned backto the str the modifed str....


Cheers
satish

[Dave Wood]

More details here...

http://www.javaworld.com/javaworld/jw-03-2000/jw-0324-javaperf.html