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

dependency

Sample code

2. Aggregation

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.

Sample code:

3. Composition
composition

Sample Code:


4. Inheritance

realization

Sample code:

5. Realization
inheritance

Sample code:

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