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Home / Class Diagrams / Class Diagram Notations /
Associations
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An association is represented as a solid line between two classes. In this sample, Class1 has a public association, named Association1, with Class2. Class1 will have Association1 as its attribute.
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If the association has get methods (with return type) and/or set methods (with parameters), then the association will be represented as a solid line and a dashed line between two classes.
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You can change the association line end symbols by selecting View | Symbols
when you right mouse click a line. The choices are a solid line, a solid line with a hollow “diamond” (aggregation), or a solid line with a filled “diamond” (composition). See the lines below. However, you would not use both at the same time.
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If you are new to UML don’t get hung up on this distinction. Many experienced people argue about it on newsgroups
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