Design Pattern C # implementation (vii)--Generator mode

Builder mode: Separates the construction of a complex object from its representation so that the same build process can create different representations.

UML Class Diagrams:

Constitute:

1.Builder (interface/abstract Class) defines the method for creating individual parts of a product, returning the created product.

2.Director Call Builder to create a part to control the creation of the product

3.ConcreteBuilder Implement/Rewrite builder method, responsible for creating product individual parts

4.Product objects that are created

In the case of mobile phones, where builder uses abstract classes, provides an empty method as the default part creation method and creates, returns a product two methods, or can be defined as an interface for specific classes to implement

Abstract classBuilder { PublicPhone Phone {Get;Private Set; } Virtual  Public voidCreatephone () {phone =NewPhone ();} Virtual  Public voidaddcpu () {}Virtual  Public voidaddmemory () {}Virtual  Public voidAddscreen () {}Virtual  PublicPhone Getphone () {returnphone; }    }

A concretebuilder that generates an Apple phone

classApplebuilder:builder {Override  Public voidaddcpu () {phone. CPU="A7"; }        Override  Public voidaddmemory () {phone. Memory="1GB"; }        Override  Public voidAddscreen () {phone. screen="LG 5.5\ ""; }    }

Director is responsible for invoking builder

class Director    {        publicvoid  Createphone (builder Builder)        {            builder.createphone ();            Builder.addcpu ();            Builder.addmemory ();            Builder.addscreen ();        }    }

The product to be generated phone

  classPhone { Public stringCPU;  Public stringMemory;  Public stringScreen ;  Public Override stringToString () {return "CPU:"+cpu+"\nmemory:"+memory+"\nscreen:"+Screen ; }    }

Execute code

Effect:

1. Change the product, just define a new ConcreteBuilder

2.Director the construction process of the product can be finely controlled (the order in which each part is created) What else? ）

Design Pattern C # implementation (vii)--Generator mode