how to import org.apache.commons.lang3 in textpad

org.apache.commons.lang3, (org.apache.commons.lang3) , using How come I can't import org.apache.commons.lang.StringUtils?
how to use import org.apache.commons,how to use org.apache.commons.io jar file into Java project using Textpad ,

Link to download the package:
https://commons.apache.org/lang/

Link to the project file:
https://drive.google.com/file/d/0B7cEKJxdNQDmX2RfRnpwY3BqQmc/view?usp=sharing


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