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any article about state, strategy and vistor pattern?

 
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I am not quite sure about state, strategy and vistor pattern. Is there any article about those pattern? thanks
 
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The good reference will be GOF book on patterns
The book name is "Design patterns" by Eric Gama et al. Hope this helps
 
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Vlissides's (he was one of the GoF) Pattern Hatching goes into some depth on Visitor, but read it only if you have an academic interest, as I'm pretty sure that Visitor won't be on the exam.
 
Win Yu
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I redd that book, but still do not understand. is there any other article that I can look at?
 
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Here's a link to a Visitor pattern article at JavaWorld.com
http://www.javaworld.com/javaworld/javatips/jw-javatip98.html
Try searching google.com - I used 'visitor "design pattern"' - lots of hits there.
 
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