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...Design patterns more gof structural adapter bridge facade creational abstract factory singleton behavioral observer iterator state visitor cs f bg ryder a rountev have become very popular in the last decade or so major source book elements of reusable object oriented software gamma helm johnson vlissides gang describe well known solutions to common problems used java libraries especially gui lar ch concerned with how classes and objects are composed make larger structures composite instantiation process system independent its created represented communication interaction between algorithms responsibility assignment strategy mediator pattern interface matcher problem incompatible interfaces solution create wrapper that maps one another key point neither has change they execute decoupled manner think you use power plug adaptor when travel europe example client written against some server right functionality but wrong zserver bar int foo zadapter option bad too hard an wrap obtain necessa...