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Game Applet

Submitted by clarkdh on Thu, 07/09/2009 - 23:51.
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So i was working through a tutorial on create java applet games and I've come across something that confuses me a bit. In the tutorial it introduces a new class but no other part of the program initializes it as far as I can tell I was wondering then what the purpose of it is. The link for it is http://javaboutique.internet.com/tutorials/Java_Game_Programming/Bildsch.... The class name is update. Does it actually DO anything? Thanks much.