UML Class Diagram and Relationships

There are several key relationships between class and class /interface in UML class diagram.

1. Dependency
class A uses class B


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2. Aggregation


In the class diagram, Class B passes/injects a reference to Class A (via method or constructor). In the, if the reference was changed, it might affect As behavior.

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3. Composition

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4. Inheritance


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5. Realization

Sample code:

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