Commons IO is a package of Java utility classes like java.io.  
Classes in this package are considered to be so standard and of such high 
reuse as to justify existence in java.io.

The Commons IO library contains utility classes, stream implementations, file filters, 
file comparators, endian transformation classes, and much more.

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Apache Commons IO Version 2.3-SNAPSHOT
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Changes in this version include:

New features:
o IO-322:  Add and use class Charsets. Thanks to ggregory. 
o IO-321:  ByteOrderMark UTF_32LE is incorrect. Thanks to ggregory. 
o IO-318:  Add Charset sister APIs to method that take a String charset name. Thanks to ggregory. 

Compatibility with 2.2 and 1.4:
Binary compatible: Yes.
Source compatible: No, see the rare case in https://issues.apache.org/jira/browse/IO-318.
Semantic compatible: No, see the rare case in https://issues.apache.org/jira/browse/IO-318.

Commons IO 2.3 requires JDK 1.6 or later.
Commons IO 2.2 requires JDK 1.5 or later.
Commons IO 1.4 requires JDK 1.3 or later.