Wed Feb 24 03:49:26 GMT 2021 From /weblog/java/string

intern

String.intern() is designed for constant strings, it's implemented in C/C++ in the hotspot core code, and it has a fixed-size hashmap of around 20K entries and if more than this number of strings are interned, the performance degrades linearly since there are hash collisions and the code has to search down linked lists.

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6988220

String.intern in Java 7 and 8 - http://java-performance.info/string-intern-in-java-6-7-8/ http://java-performance.info[..]-intern-java-6-7-8-multithreaded-access/ http://java-performance.info/string-intern-java-7-8-part-3/

Suggestion of improving string decoding - https://cl4es.github.io/2021/02/23/Faster-Charset-Decoding.html

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Wed Jan 06 12:49:46 GMT 2021 From /weblog/java/string

construction

Java's String.repeat Method in Action: Building PreparedStatement with Dynamic Number of Parameters - https://marxsoftware.blogspot.com[..]k11-string-repeat-preparedstatement.html

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Mon Jun 10 12:13:52 GMT 2019 From /weblog/java/string

substring

Substring no longer just change offset - http://www.javaadvent.com[..]hanges-to-stringsubstring-in-java-7.html

https://cl4es.github.io/2019/05/14/String-Concat-Redux.html

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Sat Mar 25 16:09:52 GMT 2017 From /weblog/java/string

regex

Introduction to a library which support faster regular expression processing: http://weblogs.java.net[..]ite/archive/2006/03/a_faster_java_r.html http://www.javaadvent.com[..]-expression-library-benchmarks-2015.html

Regex helper - https://github.com/VerbalExpressions/JavaVerbalExpressions

java-regular-expressions-cheat-sheet - https://zeroturnaround.com[..]abs/java-regular-expressions-cheat-sheet

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Wed Jul 23 01:57:03 GMT 2014 From /weblog/java/string

comparison

Better sorting should do 2 things:
1) case insensitive
2) aware of numbers in the file names. So File2 comes after File1 (obviously) but before File10

http://jroller.com[..]ingcomparator_sorting_strings_for_people

source: http://jroller.com/resources/t/tfenne/HumaneStringComparator.java

Switch comparison - http://java-performance.info/string-switch-performance/

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Mon Dec 02 03:47:12 GMT 2013 From /weblog/java/string

unicode

A common issue of Windows environment and the workaround - http://jroller.com/page/ff?entry=java_utf_8_bug_grief

Strange String issues in JVM languages, don't trust all string operations all the time! https://sites.google.com[..]/posts/strangestringissuesinjvmlanguages http://mortoray.com/2013/11/27/the-string-type-is-broken/

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Fri Nov 22 09:04:49 GMT 2013 From /weblog/java/string

alignment

Discussion of how to do string alignment - http://manycupsofcoffee.blogspot.com.au[..]va-implementation-of-optimal-string.html

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Tue Oct 02 12:31:57 GMT 2012 From /weblog/java/string

stringbuffer

In core libraries like StringBuffer we should prefer the lesser evil of code duplication to the loss of performance. - http://old.nabble.com[..]lder%7D-are-inconsistent-td34479926.html

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Tue Feb 07 10:56:48 GMT 2006 From /weblog/java/string

toString

Nice and simple toString():

  public String toString() {

    return MyClass.class.getSimpleName()

        + new LinkedHashMap() {{

      put("foo", foo);

      put("bar", bar);

      put("tee", tee);

    }};

  }

Results in:

MyClass[foo: fooValue, bar: barValue, tee: teeValue]

http://crazybob.org/2006/02/simple-tostring-hack.html

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Tue Nov 08 10:35:42 GMT 2005 From /weblog/java/string

length

Surprisingly, String length more complicate than we excepted. A char is not necessarily a complete character, so if you need to know the character length, you need to use codePointCount method

int charLen = myString.length();
int characterLen = myString.codePointCount(0, charLen);

However, if you use UTF-8 encoding, string.length() will work as expected.

More detail see:
http://forum.java.sun.com/thread.jspa?threadID=671720

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