Editing Builder pattern (section)

==Structure==
=== UML class and sequence diagram ===
[[File:w3sDesign Builder Design Pattern UML.jpg|frame|none|A sample UML class and sequence diagram for the builder design pattern.<ref>{{cite web|title=The Builder design pattern - Structure and Collaboration|url=http://w3sdesign.com/?gr=c02&ugr=struct|website=w3sDesign.com|access-date=2017-08-12}}</ref>]]

In the above [[Unified Modeling Language|UML]] [[class diagram]],
the <code>Director</code> class doesn't create and assemble the <code>ProductA1</code> and <code>ProductB1</code> objects directly.
Instead, the <code>Director</code> refers to the <code>Builder</code> interface for building (creating and assembling) the parts of a complex object,
which makes the <code>Director</code> independent of which concrete classes are instantiated (which representation is created).
The <code>Builder1</code> class implements the <code>Builder</code> interface by creating and assembling the <code>ProductA1</code> and <code>ProductB1</code> objects.
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The [[Unified Modeling Language|UML]] [[sequence diagram]] shows the run-time interactions:
The <code>Director</code> object calls <code>buildPartA()</code> on the <code>Builder1</code> object, which creates and assembles the <code>ProductA1</code> object.
Thereafter,
the <code>Director</code> calls <code>buildPartB()</code> on <code>Builder1</code>, which creates and assembles the <code>ProductB1</code> object.

=== Class diagram ===
[[Image:Builder UML class diagram.svg|500px|center|Builder Structure]]
; Builder
: Abstract interface for creating objects (product).

; ConcreteBuilder
: Provides implementation for Builder. It is an [[factory (software concept)|object able to construct other objects]]. Constructs and assembles parts to build the objects.