http://java.sun.com/developer/technicalArticles/J2EE/despat/ is one good place to study about the J2EE Design patterns. They are very good. Design patterns help you solve a business problem (depending upon your requirement, you choose which pattern - which was already implemented successfully by some one - suits you and you just choose that one)... its very good to learn the design patterns immediately after you are done with your learning of specific technologies or may be in parallel.
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