On Tue, Dec 23, 2014 at 7:46 AM, Otávio Gonçalves de Santana < otavioj...@java.net> wrote:
> > *Motivation:* StringBuffer is synchronized while StringBuilder is not > which makes StringBuilder faster than StringBuffer[1]. The strategy was > removed the StringBuffer when it is not necessary. > > > WebRev: > https://dl.dropboxusercontent.com/u/16109193/open_jdk/jaxp/buffer2builder/index.html > > > [1] > > @State(Scope.Thread) > @OutputTimeUnit(TimeUnit.SECONDS) > public class StringBufferBenchmark { > > > private List<String> texts; > @Param("10000000") > private int param; > > @Setup > public void setup() { > texts = new LinkedList<>(); > Random random = new Random(); > for (int index = 0; index < param; index++) { > char a = (char) random.nextInt(); > texts.add(String.valueOf(a)); > } > } > > @GenerateMicroBenchmark > public void stringBuffer(BlackHole bh) { > StringBuffer sb = new StringBuffer(); > texts.stream().forEach(sb::append); > bh.consume(sb.toString()); > } > > @GenerateMicroBenchmark > public void stringBuilder(BlackHole bh) { > StringBuilder sb = new StringBuilder(); > texts.stream().forEach(sb::append); > bh.consume(sb.toString()); > } > } > > > java -jar target/microbenchmarks.jar ".*StringBufferBenchmark*." -wi 20 -i > 20 -f 1 > > Benchmark (param) Mode Samples > Mean Mean error Units > m.StringBufferBenchmark.stringBuffer 10000000 thrpt 20 > 3.208 0.406 ops/s > m.StringBufferBenchmark.stringBuilder 10000000 thrpt 20 > 4.795 0.037 ops/s > -- > > Otávio Gonçalves de Santana > > twitter: http://twitter.com/otaviojava > site: *http://about.me/otaviojava <http://about.me/otaviojava>* > 55 (11) 98255-3513 > -- Otávio Gonçalves de Santana blog: http://otaviosantana.blogspot.com.br/ twitter: http://twitter.com/otaviojava site: *http://about.me/otaviojava <http://about.me/otaviojava>* 55 (11) 98255-3513
