Here are various things on Java.
Run, for instance, the B-tree animation applet. It will show you how the b-tree algorithm really works.
Another edutainment visualisation is an instance of Bresenaham line drawing algorthm animation.
Or download the char coding converter for different charsets.
I have prepared articles on Java source code compilation using gcj (a gcc tool for Java) into machine native code, running Java2ME on mobile phones (and possibly other devices), and tips and tricks for this fabulous language.
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