This package contains Java utility classes covering diverse programming areas, including: specialized and primitive collections, networking, stream-based I/O, class and resource loading, JAR files and resources, concurrent processing, distributed processing, security, XML parsing, handling configuration files, Swing GUI, memory management, and garbage collection integration. Details can be found in the Features page. Some of these classes are relatively simple, whereas some are substantial; some introduce new APIs and functionality while others workaround problems found in standard Java APIs.