Java interfaces and classes are grouped into packages. The following lists the java packages, from which you can access interfaces and classes.
Package that contains essential Java classes, including numerics, strings, objects, compiler, runtime, security, and threads. This is the only package that is automatically imported into every Java program.
Package that provides classes to manage input and output streams to read data from and write data to files, strings, and other sources.
Package that contains miscellaneous utility classes, including generic data structures, bit sets, time, date, string manipulation, random number generation, system properties, notification, and enumeration of data structures.
Package that provides classes for network support, including URLs, TCP sockets, UDP sockets, IP addresses, and a binary-to-text converter.
Package that provides an integrated set of classes to manage user interface components such as windows, dialog boxes, buttons, checkboxes, lists, menus, scrollbars, and text fields. (AWT = Abstract Window Toolkit)
Package that provides classes for managing image data, including color models, cropping, color filtering, setting pixel values, and grabbing snapshots.
Package that connects AWT components to their platform-specific implementations (such as Motif widgets or Microsoft Windows controls).
Package that enables the creation of applets through the Applet class. It also provides several interfaces that connect an applet to its document and to resources for playing audio.