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Writing Applets: This is the starting point for learning everything about writing applets.
Essential Java Classes: By taking this trail, you can find out about strings, exceptions, threads, and other Java features that are used in all kinds of Java programs.
2D Graphics: If you are using JDK 1.2, you can use 2D graphics when writing Swing components that do custom painting.
Sound: You can use sound to enhance your program's user interface.