Provides classes that are fundamental to the design of the Java programming language.

Provides classfile parsing, generation, and transformation library.

Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.

Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.

Provides the open data types and Open MBean descriptor classes.