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doubt on design patterns

 
Greenhorn
Posts: 11
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can any one pl tell me about design patters. is it necessary? how many design patterns are there? which one is very popular? how many can be used in single application?

what is the difference between architecture pattern and design pattern?
 
Ranch Hand
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may be this can help
design patterns
 
Sheriff
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Android IntelliJ IDE Java
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I'm going to move this to the intermediate forum, where I think it fits a bit better. So please post your replies there.
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