Java API

org.apache.commons.lang3	Provides highly reusable utility methods, chiefly concerned with adding value to the java.lang classes.
org.apache.commons.lang3.arch	Provides classes to work with the values of the os.arch system property.
org.apache.commons.lang3.builder	Provides classes to create consistent equals(Object), toString(), hashCode(), and compareTo(Object) methods.
org.apache.commons.lang3.compare	Provides classes to work with the Comparable and java.util.Comparator interfaces.
org.apache.commons.lang3.concurrent	Provides support classes for multi-threaded programming.
org.apache.commons.lang3.concurrent.locks	Provides support classes for multi-threaded programming.
org.apache.commons.lang3.event	Provides some useful event-based utilities.
org.apache.commons.lang3.exception	Provides functionality for Exceptions.
org.apache.commons.lang3.function	Provides functional interfaces to complement those in java.lang.function and utilities for working with Java 8 lambdas.
org.apache.commons.lang3.math	Provides java.math extensions for business mathematical classes.
org.apache.commons.lang3.mutable	Provides typed mutable wrappers to primitive values and Object.
org.apache.commons.lang3.reflect	Provides high-level uses of the java.lang.reflect APIs.
org.apache.commons.lang3.stream	Provides utility classes to complement those in java.util.stream.
org.apache.commons.lang3.text	Deprecated: Provides classes for handling and manipulating text, partly as an extension to java.text.
org.apache.commons.lang3.text.translate	Deprecated: Provides text translation routines from a set of smaller building blocks.
org.apache.commons.lang3.time	Provides classes and methods to work with dates and durations.
org.apache.commons.lang3.tuple	Provides tuple classes, both mutable and immutable Pair and Triple.
org.apache.commons.lang3.util	Provides classes that work with the Java java.util package.