The Java TM Tutorial

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## Trail: Overview

### by Monica Pawlan
of the Java Developer Connection (JDC)

> Your feedback is important to us! If you have comments about this trail, send them to: tutorial@java.sun.com. In your message, put overview in the subject header.

In general, this trail introduces core API that was added to the Java Development Kit (JDK) for the 1.1 or 1.2 release. It also introduces one standard extension--servlets. To help you sort out which features were added in which release, we provide two tables. Features Added to JDK 1.1 and Enhanced in JDK 1.2. summarizes the features added to JDK 1.1, with notes about any JDK 1.2 enhancements. Summary of Features Added to JDK 1.2. summarizes the features introduced in JDK 1.2. The tables include links to trails in this online tutorial where you can find information about each topic.

We've grouped related features together as follows:

- Essential Classes -- Collections and Internationalization
- Advanced GUI Building -- 2D Graphics, Sound, and JavaBeans
- Networking and Connectivity -- JDBC, RMI, IDL, Servlets, and Security
- Packaging -- JAR and the Extensioin Mechanism
- Advanced Language Topics -- Java Native Interface and Reflection

Because the list of features is long, we provide some tables to help you sort everything out.

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