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Java API Documentation

Preface

Java interfaces and classes are grouped into packages. The following lists the java packages, from which you can access interfaces and classes.

java.lang: Package that contains essential Java classes, including numerics, strings, objects, compiler, runtime, security and threads. Unlike other packages, java.lang is automatically imported into every Java program.
java.io: Package that provides a set of input and output streams to read and write data to files, strings, and other sources.
java.util: Package containing miscellaneous utility classes, including generic data structures, settable bits class, time, date, string manipulation, random number generation, system properties, notification, and enumeration of data structures.
java.net: Package for network support, including URLs, TCP sockets, UDP sockets, IP addresses and a binary-to-text converter.
java.awt: Package that provides user interface features such as windows, dialog boxes, buttons, checkboxes, lists, menus, scrollbars and text fields. (Abstract Window Toolkit)
java.awt.image: Package for managing image data, such as the setting the color model, cropping, color filtering, setting pixel values and grabbing snapshots.
java.awt.peer: Package that connects AWT components to their platform-specific implementation (such as Motif widgets or Microsoft Windows controls).
java.applet: Package that enables construction of applets. It also provides information about an applet's parent document, about other applets in that document, and enables an applet to play audio.

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