StringBuffer size-performance issues

Question

Hi,
I have a StringBuffer object. its length may vary from 23 to 130.Please suggest me which is better way of intializing it regarding performane,memory in the below 3 .
StringBuffer s = new StringBuffer();
StringBuffer s = new StringBuffer( 23 );
StringBuffer s = new StringBuffer( 130 );
Thanks,
Kanth.

Answer 1

This code I am putting in a application that used by
thousands of users at a time .So I am concerned with
speed rather than memory.I suggest you set the capacity at 10% more than your need like 150 or so.
Notice that StringBuffer has a faster brother called StringBuilder that isn't synchronized. It's sometimes better to synchronize outside of a class than to have every call to the class synchronized regardless of whether it's necessary or not.
One of the main advantages of using a dynamic array like StringBuffer/Builder is that it is, well, dynamic -:) It seems you're planning to use it statically only so why not consider an ordinary char array instead? It can speed up things in a performance bottleneck.