uml里的extend和include_UML依赖关系中的include和extend区别和联系

‘Extend   –   An   extend   relationship   from   use   case   A   to   use   case   B   indicates   that   an

instance   of   use   case   B   may   be   augmented   (subject   to   specific   conditions   specified   in

the   extension)   by   the   behavior   specified   by   A.   The   behavior   is   inserted   at   the

location   defined   by   the   extension   point   in   B,   which   is   referenced   by   the   extend

relationship.

Include   –   An   include   relationship   from   use   case   E   to   use   case   F   indicates   that   an

instance   of   the   use   case   E   will   also   contain   the   behavior   as   specified   by   F.   The

behavior   is   included   at   the   location   which   defined   in   E.’

quoted from OMG

通俗来说，建一座房子   include   建一个房门(因为每个房子都会有房门；安装通水管道   extend   建一座房子(因为并不是每个房子都要建通水管道)

posted on 2008-01-28 15:21 Eric-1001c 阅读(2495) 评论(2)  编辑  收藏 所属分类: UML