Apache-Commons

In this post, we learn about the Apache Commons IO FileAlterationObserver - using which we can observe the state of files and directories.

The Apache Commons Lang CharSet represents a set of characters. This post covers the Apache Commons Lang CharSet and CharSetUtils class.

We will learn about the Apache Commons Lang RandomStringUtils class for generating random strings for simple use cases in this post.

In this post, we will learn about Apache Commons Lang Pair class. We use this class when we have a need to manage one or more pair of values.

The Apache Commons Text WordUtils class has many static utility methods to perform operations on strings that contain words.

The Apache Commons Lang Validate class in the Apache Commons Lang library helps in validating arguments to a method (or a constructor)

The Apache Commons Lang library provides utility classes and methods. In the post we will learn about the Apache Commons Lang Range class.

The Apache Commons Lang ComparableUtils has utility methods for translating a Comparable result into a boolean represented as a Predicate.

The Apache Commons CLI is a library that provides API for parsing command-line options/arguments which we pass to programs.

Apache Commons FileUtils has utility methods for file and directory manipulation. This post is on Apache Commons IO FileUtils directory operations.