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Commons Lang

Wiki Markup\[http://jakarta.apache.org/commons/lang Lang\] aims to provide:

• Comprehensive String handling utilities
• Enumerated types (pre JDK 1.5)
• Nested exceptions (pre JDK 1.4)
• Builders to create hashCode, equals, toString and compareTo methods
• Utilities for Object, Date and Numbers
  

...

The Javadoc of the latest version is \[http://jakarta.apache.org/commons/lang/api/index.html available\](2.1) is available.

The Javadoc of the CVS version (development) is available.

Development plan for 2.

...

2

1. Bug fixes
2. StrTokenizer
3. StrBuilder
4. VariableFormatter/interpolator - 18962
   
   

Other ideas

1. Wiki Markup
   [

   StringUtils].ordinalIndexOf() 2. [StringBuffer] replacement 3. Mutable Number classes 4. [StringTokenizer] replacement: (DONE - Tokenizer) 5. 15082 \[lang\] elapsed time formatting utility method 5. 18962 \[lang\] New Method: getSubstitutedValues( String, Map ) 5. 19331 \[lang\] General case: infinite loop: [ToStringBuilder].reflectionToString 5. 20015 \[lang\] Make Entities public and unit test 5. 21333 Add [TimeoutController] 5. 21663

   21663|http://issues.apache.org/bugzilla/show_bug.cgi?id=21663] \[lang\] Add support in [ToStringStyle] for [DateFormat].

   5. 22172 \[lang\] [DateUtils].parseCVS behavior parsing "h:mm z" 5. 22692 [StringUtils].split ignores empty items 5. 22717

   - *Grows quickly into commons-convert*

2. Wiki Markup
   [27643|http://issues.apache.org/bugzilla/show_bug.cgi?id=27643] \[lang\

   ] mutable numbers 5. 23356 make [DurationFormatUtils] public! 5. 23557 [WordUtils

   ]

   .capitalizeFully(String str) should take a delimiter 5. 23749

   \[

   lang

   patch\]

   \

   [

   PATCH\

   ClassUtils].newInstance

   [NumberRange]

   method -

   adds inclusive and exclusive end points 5. 24910

   *Seems unnecessary*

3. Wiki Markup
   [29149|http://issues.apache.org/bugzilla/show_bug.cgi?id=29149]

   new [StringUtils].split methods that split on the whole separator string 5. 25227

   \[lang\] [StringEscapeUtils].unescapeHtml() doesn't handle an

   hex

   empty

   entities

   entity

   5.

   -

   25560 [DateUtils].truncate()

   *Empty entity is

   off

   in

   by

   fact

   one

   illegal

   hour

   HTML,

   when

   so

   using

   need

   a

   to

   date

   decide

   in

   if

   DST

   we

   switch 'zone' 5. 26056 \[lang\] Add methods to [ArrayUtils]: add at end and insert-like ops 5. 26297 \[lang\] [BitSetUtils] class, toIndexArray and fromIndexArray 5. 26659

   should ignore. Current behaviour seems acceptable as we're not in the work with bad HTML market.*

4. Wiki Markup
   [26659|http://issues.apache.org/bugzilla/show_bug.cgi?id=26659] \[lang\] add method to [DateUtils] to get the distance between 2 dates

   5.

   -

   26922 \[lang\] public static boolean [DateUtils].equals(Date dt1, Date dt2) ? 5. 27592

   *Mainly replicated by [DurationFormatUtils], or non-obvious*

5. Wiki Markup
   [29692|http://issues.apache.org/bugzilla/show_bug.cgi?id=29692] \[lang\]

   [

   String indentation feature request - *Needs design as a non-simple problem*

6. Wiki Markup
   [22172|http://issues.apache.org/bugzilla/show_bug.cgi?id=22172]

   WordUtils] capitalize improvement 5. 27640 \[lang\]\[patch\] [ClassUtils].primitivesToWrappers method 5. 27643

   \[lang\]

   \[patch\]

   [

   ClassUtils

   DateUtils].

   newInstance

   parseCVS

   method

   behavior

   5. 27778 \[lang\] add remove methods to [ArrayUtils] 5. 27876 \[lang\] [ReflectionToStringBuilder].toString(null) throws exception by design 5. 27877

   parsing "h:mm z" - *Moved to sandbox*

7. Wiki Markup
   [26297|http://issues.apache.org/bugzilla/show_bug.cgi?id=26297] \[lang

   \]\[patch

   \]

   Make

   [

   ClassUtils

   BitSetUtils]

   methods null-safe

   class, toIndexArray and fromIndexArray

8. 21333 Add TimeoutController - Class in HttpClient. Leaving til 3.0 as not throw an IAE. 5. 29149 \[lang\] [StringEscapeUtils].unescapeHtml() doesn't handle an empty entity 5. 29163 Make [StopWatch] validate state transitions 5. 29294 \[lang\]\[PATCH\] lang.math.Fraction class deficienciesmuch movement on it

9. Wiki Markup
   [30674|http://issues.apache.org/bugzilla/show_bug.cgi?id=30674] Support [HttpClient]'s [DateParser] class - *This is basically a Date parseDate(String dateValue, String\[\] dateFormats) method.*

10. LocaleUtils - including toLocale(String,String)
11. CloneUtils - multiple ways to clone an object
    

Articles

This article http://www.devx.com/Java/Article/29392/0/page/6 discusses some of the interesting classes in Commons Lang with real world examples.