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I've been turned on to the Apache IO package here, so have downloaded it.

Yet, not wanting to clutter up my project with more stuff than I need, but simultaneously not wanting to omit necessary bits, I want to know just which jar file or files I need to add. There are several:

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Based on what I found here, adding the .jar[s] should go smoothly, but which one[s] do I need?

Is commons-io-2.4.jar enough? Is commons-io-2.4-sources.jar enough? Both of them? Or...???

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You only need the commons-io-2.4.jar to use the library.

Explanation on the other ones

commons-io-2.4-sources.jar: sourcecode for commons-io-2.4.jar

commons-io-2.4-javadoc.jar: documentation for commons-io-2.4.jar

commons-io-2.4-tests.jar: tests for commons-io-2.4.jar

commons-io-2.4-test-sources.jar: sourcecode for commons-io-2.4-tests.jar

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