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  1. PO
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    <p>You should give <a href="http://ahmadsoft.org/ropes/" rel="nofollow noreferrer">ropes</a> a try. The site is skimpy on details, but there's a great article <a href="http://www.ibm.com/developerworks/java/library/j-ropes/index.html" rel="nofollow noreferrer">here</a> with a better description and some good <a href="http://www.ibm.com/developerworks/java/library/j-ropes/index.html#fig4" rel="nofollow noreferrer">benchmarks comparing append performance</a>.</p> <p>I haven't actually used the ropes package, haven't had a good enough excuse to. Looks promising, though.</p> <p><b>Edit: Additional benchmark info</b></p> <p>I downloaded the <code>PerformanceTest</code> class from the ropes article, and added tests for <code>StringBuilder</code> in addition to <code>StringBuffer</code>. The performance improvement of <code>StringBuilder</code> seems negligible.</p> <p>I downloaded the test code from the ropes article and changed the test to include <code>StringBuilder</code> and <code>StringBuffer</code>.</p> <pre> Append plan length: 260 [StringBuilder] Average= 117,146,000 ns Median= 114,717,000ns [StringBuffer] Average= 117,624,400 ns Median= 115,552,000ns [Rope] Average= 484,600 ns Median= 483,000ns Append plan length: 300 [StringBuilder] Average= 178,329,000 ns Median= 178,009,000ns [StringBuffer] Average= 217,147,800 ns Median= 216,819,000ns [Rope] Average= 252,800 ns Median= 253,000ns Append plan length: 500 [StringBuilder] Average= 221,356,200 ns Median= 214,435,000ns [StringBuffer] Average= 227,432,200 ns Median= 219,650,000ns [Rope] Average= 510,000 ns Median= 507,000ns </pre> <p>The difference between StringBuilder and StringBuffer isn't that great. For the task at hand, Ropes seem like a clear win here.</p>
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    1. POgetting better performance appending strings than going through standard Java stringbuilder.append
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    1. USSam Barnum
    1. USSam Barnum
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    1. CORopes performs well compared with String concatenation, which is no surprise at all; and better than StringBuffer, whose operations are synchronized. The IBM page doesn't show a comparison with StringBuilder, which was created specifically to overcome this problem.
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      1. USCarl Smotricz
    2. COAccording to the article, the performance gain of Ropes over StringBuffer was due mostly to the overhead of resizing/copying the backing char[] array in the StringBuffer as it grows. This same overhead applies to StringBuilder.
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      1. USSam Barnum
    3. CO@Carl Smotricz: If you follow Steve B's suggestion of setting a high initial capacity for your StringBuilders, I think StringBuilder would likely be faster than Ropes. If you have many buffer objects and aren't sure how large they may grow, Ropes sound like a perfect candidate for a job like this.
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      1. USSam Barnum
 

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