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From "Stefan Zeller (JIRA)" <>
Subject [jira] Created: (LANG-523) StrBuilder is slow
Date Fri, 21 Aug 2009 12:11:14 GMT
StrBuilder is slow

                 Key: LANG-523
             Project: Commons Lang
          Issue Type: Improvement
    Affects Versions: 2.4
            Reporter: Stefan Zeller

I need a faster StringBuffer for java 1.4 branch.

So I tested StrBuffer. The result is not sufficient as it is 500 times slower than StringBuffer.
The problem is that currently the StrBuilder increases the buffer size by the length of the
string that thought to be appended.

Changing this strategy to provide the double of the needed buffer size brings the performance
near to the StringBuilder.

Here the times (the average of four runs in ms) for the Testcase attached. Where MyStrBuilder
is the pathed version of StrBuilder

startStringBuffer: 	105.25
startStrBuilder:	5863.75
startStringBuilder:	55
startMyStringBuilder: 	54

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