Also some more importent

  * Custom Networking — An introduction to the Java platform's powerful networking features.
  * The Extension Mechanism — How to make custom APIs available to all applications running on the Java platform.
  * Full-Screen Exclusive Mode API — How to write applications that more fully utilize the user's graphics hardware.
  * Generics — An enhancement to the type system that supports operations on objects of various types while providing compile-time type safety. Note that this lesson is for advanced users. The Java Language trail contains a Generics lesson that is suitable for beginners.
  * Internationalization — An introduction to designing software so that it can be easily be adapted (localized) to various languages and regions.
  * JavaBeans — The Java platform's component technology.
  * JDBC Database Access — Introduces an API for connectivity between the Java applications and a wide range of databases and a data sources.
  * JMX— Java Management Extensions provides a standard way of managing resources such as applications, devices, and services.
  * JNDI— Java Naming and Directory Interface enables accessing the Naming and Directory Service such as DNS and LDAP.
  * RMI — The Remote Method Invocation API allows an object to invoke methods of an object running on another Java Virtual Machine.
  * Reflection — An API that represents ("reflects") the classes, interfaces, and objects in the current Java Virtual Machine.
  * Security — Java platform features that help protect applications from malicious software.
  * Sound — An API for playing sound data from applications.
  * 2D Graphics — How to display and print 2D graphics in applications.