Refactoring:ImprovingtheDesignofExistingCode第二版_Refactoring:ImprovingtheDesignof - CSDN文库

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i

Chapter 1

Refactoring: A First Example

HowdoIbegintotalkaboutrefactoring?Thetraditionalwayisbyintroducingthe

historyofthesubject,broadprinciples,andthelike.Whensomebodydoesthatata

conference,Igetslightlysleepy.Mymindstartswandering,withalowpriority

backgroundprocesspollingthespeakeruntiltheygiveanexample.

TheexampleswakemeupbecauseIcanseewhatisgoingon.Withprinciples,itistoo

easytomakebroadgeneralizations—andtoohardtofigureouthowtoapplythings.An

examplehelpsmakethingsclear.

SoI’mgoingtostartthisbookwithanexampleofrefactoring.I’lltalkabouthow

refactoringworksandwillgiveyouasenseoftherefactoringprocess.Icanthendothe

usualprinciplesstyleintroductioninthenextchapter.

Withanyintroductoryexample,however,Irunintoaproblem.IfIpickalarge

program,describingitandhowitisrefactoredistoocomplicatedforamortalreaderto

workthrough.(Itriedthiswiththeoriginalbook—andendedupthrowingawaytwo

examples,whichwerestillprettysmallbuttookoverahundredpageseachtodescribe.)

However,ifIpickaprogramthatissmallenoughtobecomprehensible,refactoring

doesnotlooklikeitisworthwhile.

I’mthusintheclassicbindofanyonewhowantstodescribetechniquesthatareuseful

forrealworldprograms.Frankly,itisnotworththeefforttodoalltherefactoringthat

I’mgoingtoshowyouonthesmallprogramIwillbeusing.ButifthecodeI’mshowing

youispartofalargersystem,thentherefactoringbecomesimportant.Justlookatmy

exampleandimagineitinthecontextofamuchlargersystem.

THE STARTING POINT

Inthefirsteditionofthisbook,mystartingprogramprintedabillfromavideorental

store,whichmaynowleadmanyofyoutoask:“What’savideorentalstore?”Rather

thananswerthatquestion,I’vereskinnedtheexampletosomethingthatisbotholder

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