Apache Commons’ FileUtils and IOUtils utilities

A popular companion of JCL is the Apache Commons project (https://commons.apache.org), which provides many libraries that complement the JCL functionality. The classes of the org.apache.commons.io package are contained in the following root package and sub-packages:

• The org.apache.commons.io root package contains utility classes with static methods for common tasks, such as the popular FileUtils and IOUtils classes, described in the FileUtils class and Class IOUtils class sections respectively.
• The org.apache.commons.io.input package contains classes that support input based on the InputStream and Reader implementations, such as XmlStreamReader or ReversedLinesFileReader.
• The org.apache.commons.io.output package contains classes that support output based on the OutputStream and Writer implementations, such as XmlStreamWriter or StringBuilderWriter.
• The org.apache.commons.io.filefilter package contains classes...