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...Https www guru com explain what is java design pattern a language independent strategy for solving common object oriented problem it describes how to structure classes meet given requirement creational patterns and factory this used define describe objects are created at class instantiation time the create an without exposing creation logic client refer newly using interface which get way access elements of collection in sequential manner iterator when service locator we want locate various services jndi use mention many ways can you singleton single there two famous lazy loading eager need decouple abstraction from its implementation order that vary independently bridge will be helpful add new functionality existing decorator allows user changing step process first make constructor private so operator cannot instantiate return if not null otherwise same via method possible write thread safe multiple example by static instance initialized during writing double checked locking enum simp...