www.carfield.com.hk

intern.txt

2021-02-24T03:49:26Z

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

construction.txt

2021-01-06T12:49:46Z

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

substring.txt

2019-06-10T12:13:52Z

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

regex.txt

2017-03-25T16:09:52Z

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

comparison.txt

2014-07-23T01:57:03Z

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/

unicode.txt

2013-12-02T03:47:12Z

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/

alignment.txt

2013-11-22T09:04:49Z

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

stringbuffer.txt

2012-10-02T12:31:57Z

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

toString.txt

2006-02-07T10:56:48Z

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

length.txt

2005-11-08T10:35:42Z

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