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在uml中“依赖”与“关联”到底有什么区别？
来源: 互联网 发布时间：2015-04-16
本文导语: thank you!!!!! | Dependency Relationship Draw a dependency relationship between two classes, or between a class and an interface, to show that the client class depends on the supplier class/interface to provide certain se...
thank you!!!!!
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Dependency Relationship
Draw a dependency relationship between two classes, or between a class and an interface, to show that the client class depends on the supplier class/interface to provide certain services, such as:
?The client class accesses a value (constant or variable) defined in the supplier class/interface.
?Operations of the client class invoke operations of the supplier class/interface.
?Operations of the client class have signatures whose return class or arguments are instances of the supplier class/interface.
A dependency relationship is a dotted line with an arrowhead at one end:The arrowhead points to the supplier class.
Association Relationship
An association provides a pathway for communication. The communication can be between use cases and actors, between two classes or between a class and an interface. Associations are the most general of all relationships and consequentially the most semantically weak. If two objects are usually considered independently, the relationship is an association
Draw a dependency relationship between two classes, or between a class and an interface, to show that the client class depends on the supplier class/interface to provide certain services, such as:
?The client class accesses a value (constant or variable) defined in the supplier class/interface.
?Operations of the client class invoke operations of the supplier class/interface.
?Operations of the client class have signatures whose return class or arguments are instances of the supplier class/interface.
A dependency relationship is a dotted line with an arrowhead at one end:The arrowhead points to the supplier class.
Association Relationship
An association provides a pathway for communication. The communication can be between use cases and actors, between two classes or between a class and an interface. Associations are the most general of all relationships and consequentially the most semantically weak. If two objects are usually considered independently, the relationship is an association
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