U​M​L​中​继​承​实​现​依​赖​关​联​聚​合​组​合​的​联​系​与​区​别​_​线​条​箭​头

http://wenku.baidu.com/link?url=ZjlPxyZtoxkdP3ecIACq8HS46EQJWET9UIMgRPrYVMZRRPrY9WPLzhMaEIQBgaLPsJLrXXvJeUFifzps5aendwS63lRlyd41gnxgkmILksy