Realization

In java when one class implements and interface it is called realization, the class realizes the interface.

In UML modeling, a realization relationship is a relationship between two model elements, in which one model element (the client) realizes (implements or executes) the behavior that the other model element (the supplier) specifies

a realization is displayed in the diagram editor as a dashed line with an unfilled arrowhead that points from the client (realizes the behavior) to the supplier (specifies the behavior).
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