Design Pattrens in java good sites

http://www.fluffycat.com/Java-Design-Patterns
http://www.allapplabs.com/java_design_patterns/factory_pattern.htm
http://www.javacamp.org/designPattern/
http://java.sun.com/blueprints/corej2eepatterns/Patterns/
http://www.oodesign.com/

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Click on any pattern name for details.