Apache-Commons

The Apache Commons Lang ObjectUtils class from the Apache Commons Lang3 library has many static utility methods operating on Object instances.

The Apache Commons ComparatorUtils provides utils for creating and using comparators from org.apache.commons.collections4.comparators package.

The Apache Commons Collections SetUtils class has utility methods and decorators for Set and SortedSet instances.

In this post, we will explore all the utility methods and decorators for List instances in the Apache Commons Collections ListUtils class.

We can use the Apache Commons Lang Diffable to compare two objects of the same class and find the differences among the values of all fields.

The Apache Commons BidiMap (a bidirectional map) is an interface using which we can perform a lookup on a map in either direction.

Apache Commons Lang Mutable provides mutable access to a value. In this post, we will learn about the Apache Commons Lang Mutable Class.

The ThreadUtils class from the Apache Commons Lang library has helper methods for working with Java threads and ThreadGroups.

The EnumUtils class from Apache Commons Lang provides several static methods (helper methods) for working with Java enums.

Apache Commons IO FileAlterationMonitor is a runnable to notify the registered observers at specified time interval with file system changes