Contains all of the classes for creating user interfaces and for painting graphics and images.

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

Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).

Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.

A small toolkit of classes that support lock-free thread-safe programming on single variables.

Defines a contract between user-interface components and an assistive technology that provides access to those components.

Provides the core classes for the Java Management Extensions.

Provides the definition of the monitor classes.

Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.

Defines XML/Java Type Mappings.