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This article is about how to implement design patterns in Java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

/ * *

* Design Pattern In Java

* Name:Factory

* objective: to create two product lines, Mac and Win, using the factory model

* Mac:MacRam,Maccpu

* Win:WinRam,WinCpu

* A:abstract

* C:Concret

* Author:blackphoenix

* Modify Date:2002-08-17

, /

/ * *

* Abstract product class Ram Cpu

, /

Abstract class AProductRam {

Public String getProduct () {

Return this+ "Product"

}

}

Abstract class AProductCpu {

Public String getProduct () {

Return this+ "Product"

}

}

/ * *

* specific product MacRam,WinRam

, /

Class CProductMacRam extends AProductRam {

Public String toString () {

Return "MacRam"

}

}

Class CProductWinRam extends AProductRam {

Public String toString () {

Return "WinRam"

}

}

/ * *

* specific product MacCpu,WinCpu

, /

Class CProductMacCpu extends AProductCpu {

Public String toString () {

Return "MacCpu"

}

}

Class CProductWinCpu extends AProductCpu {

Public String toString () {

Return "WinCpu"

}

}

/ * *

* the code for interface changes when a new product family is generated

, /

/ *

Class CProductNewRam extends AProductRam {

Public String toString () {

Return "NewRam"

}

}

Class CProductNewCpu extends AProductCpu {

Public String toString () {

Return "NewCpu"

}

}

, /

/ * *

* Abstract Factory AFactory

, /

Interface AFactory {

Public AProductRam CreateProductRam ()

Public AProductCpu CreateProductCpu ()

}

/ * *

* specific factory CFactoryMac

* create Mac product family

× MacRam MacCpu

, /

Class CFactoryMac implements AFactory {

Public AProductRam CreateProductRam () {

Return new CProductMacRam ()

}

Public AProductCpu CreateProductCpu () {

Return new CProductMacCpu ()

}

}

/ * *

* specific factory CFactoryWin

* create Win product family

× WinRam WinCpu

, /

Class CFactoryWin implements AFactory {

Public AProductRam CreateProductRam () {

Return new CProductWinRam ()

}

Public AProductCpu CreateProductCpu () {

Return new CProductWinCpu ()

}

}

/ * *

* to generate a new product line, dispatch a new product factory to the customer

* at the same time to derive a new specific product

* CFactoryNew

* NewMem,NewCpu

, /

/ *

Class CFactoryNew implements AFactory {

Public AProductRam CreateProductRam () {

Return new CProductNewRam ()

}

Public AProductCpu CreateProductCpu () {

Return new CProductNewCpu ()

}

}

, /

/ * *

* client

* 1. Use FactoryMac to create Mac series products: ProductMacRam,ProductMacCpu

× 2. Use FactoryWin to create Win series products: ProductWinRam,ProductWinCpu

* 3. As long as you know CFactoryMac,CFactoryWin (specific factory) and

* AProductRam,AProductCpu (abstract product) is fine, as for the creation of specific products

* customers do not need to care about details

, /

Class Factory {

Private static void printProduct (String v) {

System.out.println (v)

}

Public static void main (String [] args) {

AProductRam ProductMacRam=null,ProductWinRam=null

AProductCpu ProductMacCpu=null,ProductWinCpu=null

CFactoryMac FactoryMac=new CFactoryMac ()

CFactoryWin FactoryWin=new CFactoryWin ()

ProductMacRam=FactoryMac.CreateProductRam ()

ProductMacCpu=FactoryMac.CreateProductCpu ()

ProductWinRam=FactoryWin.CreateProductRam ()

ProductWinCpu=FactoryWin.CreateProductCpu ()

PrintProduct (ProductMacRam.getProduct ())

PrintProduct (ProductMacCpu.getProduct ())

PrintProduct (ProductWinRam.getProduct ())

PrintProduct (ProductWinCpu.getProduct ())

/ * *

* the code changed by the client when a new product line is generated

, /

/ *

AProductRam ProductNewRam=null

AProductCpu ProductNewCpu=null

CFactoryNew FactoryNew=new CFactoryNew ()

ProductNewRam=FactoryNew.CreateProductRam ()

ProductNewCpu=FactoryNew.CreateProductCpu ()

PrintProduct (ProductNewRam.getProduct ())

PrintProduct (ProductNewCpu.getProduct ())

, /

}

}

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