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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.
Collections:
Using the classes and interfaces in the collections framework
you can group objects together into a single object.
Internationalization:
Essential if you want to create a program that can be used
by people all over the world.
Furthermore, you can use the information about formatting
dates, numbers, and strings in any program.