Editing Bridge pattern (section)

=== UML class and sequence diagram ===
[[File:w3sDesign Bridge Design Pattern UML.jpg|frame|none|A sample UML class and sequence diagram for the Bridge design pattern.<ref>{{cite web|title=The Bridge design pattern - Structure and Collaboration|url=http://w3sdesign.com/?gr=s02&ugr=struct|website=w3sDesign.com|access-date=2017-08-12}}</ref>]]
In the above Unified Modeling Language [[class diagram]], an abstraction (<code>Abstraction</code>) is not implemented as usual in a single inheritance hierarchy.
Instead, there is one hierarchy for
an abstraction (<code>Abstraction</code>) and a separate hierarchy for its implementation (<code>Implementor</code>), which makes the two independent from each other.
The <code>Abstraction</code> interface (<code>operation()</code>) is implemented in terms of (by delegating to)
the <code>Implementor</code> interface (<code>imp.operationImp()</code>).
<br>
The [[Unified Modeling Language|UML]] [[sequence diagram]]
shows the run-time interactions: The <code>Abstraction1</code> object delegates implementation to the <code>Implementor1</code> object (by calling <code>operationImp()</code> on <code>Implementor1</code>),
which performs the operation and returns to <code>Abstraction1</code>.