[Java] Use Apache Commons StringUtils.Replace Instead of String.replace

Quote

In general, the String.replace method works fine and is pretty efficient, especially if you’re using Java 9. But if your application requires a lot of replace operations and you haven’t updated to the newest Java version, it still makes sense to check for faster and more efficient alternatives.

Here has a simple experiments:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

package your.simple.java; import java.util.Calendar; import java.util.Date; import org.apache.commons.lang.StringUtils; public class StringReplacementTest { private String test = "test"; private int count = 100000000; public static void main(String[] args) { new StringReplacementTest().test1(); new StringReplacementTest().test2(); } public void test1() { Date from = Calendar.getInstance().getTime(); for (int i = 0; i < count; i++) { test.replace("test", "simple test"); } Date to = Calendar.getInstance().getTime(); long seconds = (to.getTime() - from.getTime()) / 1000; System.out.println("[test1] seconds = " + seconds); } public void test2() { Date from = Calendar.getInstance().getTime(); for (int i = 0; i < count; i++) { StringUtils.replace(test, "test", "simple test"); } Date to = Calendar.getInstance().getTime(); long seconds = (to.getTime() - from.getTime()) / 1000; System.out.println("[test2] seconds = " + seconds); } }

Execution result:

[test1] seconds = 56
[test2] seconds = 9

Reference
[1] https://dzone.com/articles/11-simple-java-performance-tuning-tips?edition=334833&utm_source=Daily%20Digest&utm_medium=email&utm_campaign=Daily%20Digest%202017-11-03