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Builder Design Pattern

definition
Separate the construction of a complex object from its representation so that the same construction process can create different representations.

Frequency of use: medium low

《Builder Design Pattern 》

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UML class diagram

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participants
The classes and/or objects participating in this pattern are:

Builder (VehicleBuilder)
specifies an abstract interface for creating parts of a Product object
ConcreteBuilder (MotorCycleBuilder, CarBuilder, ScooterBuilder)
constructs and assembles parts of the product by implementing the Builder interface
defines and keeps track of the representation it creates
provides an interface for retrieving the product
Director (Shop)
constructs an object using the Builder interface
Product (Vehicle)
represents the complex object under construction. ConcreteBuilder builds the product’s internal representation and defines the process by which it’s assembled
includes classes that define the constituent parts, including interfaces for assembling the parts into the final result

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