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

Provides classfile parsing, generation, and transformation library.

Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.

Generic API for calendar systems other than the default ISO.

Provides classes to print and parse dates and times.

Access to date and time using fields and units, and date time adjusters.

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.

Provides the definition of the Timer MBean.