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...Object oriented programming ii overview reference single implementation inheritance multiple interface a programmer s guide to java certification comprehensive primer and supertypes chapter assigning casting passing references the instanceof operator polymorphism dynamic method lookup choosing between aggregation encapsulation packages usage definition accessibility modifiers for classes interfaces default private member public protected abstract methods final members parameters cs spring kam oop fm by contract provides which allow new type names be introduced used polymorphically also permit support defining design implementing an defines specifying prototypes of not class specifies it implements as comma separated list using their clause in header iswitch is therefore cannot instantiated void switchon switchoff should declared boolean ison variables can light allows defined implemenations pure contracts tubelight extends lightbulb note that subclasses implement word on typing subtype...