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# Learning the Java Language: End of Trail

You have reached the end of the "Learning the Java Language" trail.

If you have comments or suggestions about this trail, use our feedback page to tell us about it.

Essential Classes: Learn about the most-used classes in the JDK APIs including `String`, `System`, `Thread` and the classes in `java.io`.

Creating a GUI With JFC/Swing: Once you know how to create applications or applets, follow this trail to learn how to create their user interfaces.

Custom Networking: If you're interested in writing applications or applets that use the network, follow this trail. You'll learn about URLs, sockets, datagrams, and security.

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