With Java technology, you can use the same application from any kind of machine -- a PC, a Macintosh computer, a network computer, or even new technologies like Internet screen phones.
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Documentation
The Java Development Kit (JDK) Documentation contains release notes, the API specifications, a guide to new features, tool documentation and demos for the JDK software.
JDK Documentation

API Documentation
Reference to packages, classes and members. Generated by javadoc.
Java Platform 1.1 Core API Specification

JDBC Data Access API
JDBC^TM technology is an API that lets you access virtually any tabular data source from the Java^TM programming language. It provides cross-DBMS connectivity to a wide range of SQL databases, and now, with the new JDBC 2.0 API, it also provides access to other tabular data sources, such as spreadsheets or flat files. The JDBC API allows developers to take advantage of the Java platform's "Write Once, Run Anywhere^TM" capabilities for industrial strength, cross-platform applications that require access to enterprise data.
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List of Drivers Available
JDBC Home Page

Java Servlet API
The Java^TM Servlet API is a Standard Extension to the Java platform that provides web application developers with a simple consistent mechanism for extending the functionality of a web server. A servlet can almost be thought of as an applet that runs on the server side -- without a face.
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Java Servlet Home Page