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Which jar provides FileUtils which contains methods for file operations?

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Which jar provides FileUtils which contains methods for file operations?

(a) file

(b) apache commons

(c) file commons

(d) dir

The question was asked in an interview.

This question is from File and Directory topic in portion Autoboxing & Miscellaneous of Java

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Right option is (b) apache commons

For explanation I would say: FileUtils is a part of apache commons which provides various methods for file operations like writeStringToFile.

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