Java开发者问题与解决方案大全（第4版）

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completeexamples.Thosethatbeginwithadeclarationorexecutablestatement,

ofcourse,areexcerpts.However,thefullversionsoftheseexcerptshavebeen

compiledandrun,andtheonlinesourceincludesthefullversions.

Recipesarenumberedbychapterandnumber,so,forexample,Recipe8.1refers

tothefirstrecipeinChapter8.

TypesettingConventions

Thefollowingtypographicconventionsareusedinthisbook:

Italic

Usedforcommands,filenames,andexampleURLs.Itisalsousedfor

emphasisandtodefinenewtermswhentheyfirstappearinthetext.

Constant width

UsedincodeexamplestoshowpartialorcompleteJavasourcecode

programlistings.Itisalsousedforclassnames,methodnames,variable

names,andotherfragmentsofJavacode.

Constant width bold

Usedforuserinput,suchascommandsthatyoutypeonthecommandline.

Constant width italic

Showstextthatshouldbereplacedwithuser-suppliedvaluesorbyvalues

determinedbycontext.

TIP

Thiselementsignifiesatiporsuggestion.

NOTE

Thiselementsignifiesageneralnote.

WARNING

Thisiconindicatesawarningorcaution.

CodeExamples

Thecodesamplesforthisbookareontheauthor’sGitHub.Mostareinthe

repositoryjavasrc,butafewarepulledinfromoneotherrepository,darwinsys-

api.DetailsondownloadingtheseareinRecipe1.6.

Manyprogramsareaccompaniedbyanexampleshowingtheminaction,run

fromthecommandline.Thesewillusuallyshowapromptendingineither$for

Unixor>forWindows,dependingonwhichcomputerIwasusingthedayI

wrotethatexample.Ifthereistextbeforethispromptcharacter,itcanbe

ignored.Itmaybeapathnameorahostname,again,dependingonthesystem.

Theseexampleswillusuallyalsoshowthefullpackagenameoftheclass

becauseJavarequiresthiswhenstartingaprogramfromthecommandline.And

becausethatwillremindyouwhichsubdirectoryofthesourcerepositorytofind

thesourcecodein,Iwon’tbepointingitoutexplicitlyveryoften.

Weappreciate,butgenerallydonotrequire,attribution.Anattributionusually

includesthetitle,author,publisher,andISBN.Forexample:“JavaCookbookby

IanF.Darwin(O’Reilly).Copyright2020RejmiNetGroup,Inc.,978-1-492-

07258-4.”

Ifyoufeelyouruseofcodeexamplesfallsoutsidefairuseorthepermission

givenabove,feelfreetocontactusatpermissions@oreilly.com.

O’ReillyOnlineLearning

NOTE

Formorethan40years,O’ReillyMediahasprovidedtechnologyandbusinesstraining,

knowledge,andinsighttohelpcompaniessucceed.

Ouruniquenetworkofexpertsandinnovatorssharetheirknowledgeand

expertisethroughbooks,articles,conferences,andouronlinelearningplatform.

Acknowledgments

IwroteintheAfterwordtothefirsteditionthat“writingthisbookhasbeena

humblingexperience.”Ishouldaddthatmaintainingithasbeenhumbling,too.

Whilemanyhavebeenlavishwiththeirpraise—oneverykindreviewercalledit

“arguablythebestbookeverwrittenontheJavaprogramminglanguage”—I

havebeenhumbledbythenumberoferrorsandomissionsinearliereditions.I

haveendeavoredtocorrectthese.

Mylifehasbeentouchedmanytimesbytheflowofthefatesbringingmeinto

contactwiththerightpersontoshowmetherightthingattherighttime.Steve

Munro,withwhomI’velongsincelosttouch,introducedmetocomputerswhen

wewereinthesameclassinhighschool—inparticularanIBM360/30atthe

TorontoBoardofEducationthatwasbiggerthanalivingroom,had32or64K

(notMorG!)ofmemory,andhadperhapsthepowerofaPC/XT.ThelateHerb

KugeltookmeunderhiswingattheUniversityofTorontowhileIwaslearning

aboutthelargerIBMmainframesthatcamelater.TerryWoodandDennisSmith

attheUniversityofTorontointroducedmetomini-andmicro-computersbefore

therewasanIBMPC.Oneveningsandweekends,theTorontoBusinessClubof

ToastmastersInternationalandAlLambert’sCanadaSCUBASchoolallowed

metodevelopmypublicspeakingandteachingabilities.Severalpeopleatthe

UniversityofToronto,butespeciallyGeoffreyCollyer,taughtmethefeatures

andbenefitsoftheUnixoperatingsystematatimewhenIwasreadytolearnit.

ThankstothemanyLearningTreeinstructorsandstudentswhoshowedme

waysofimprovingmypresentations.Istillteachfor“TheTree”andrecommend

theircoursesforthebusydeveloperwhowantstozeroinononetopicindetail

overfourdays.

Closertothisproject,TimO’Reillybelievedinmy“littleLintbook”whenit

wasjustasamplechapterfromaproposedlongerwork,enablingmyearlyentry

intotherarefiedcircleofO’Reillyauthors.Yearslater,MikeLoukides

encouragedmetokeeptryingtofindaJavabookideathatbothheandIcould

workwith.AndhestuckbymewhenIkeptfallingbehindthedeadlines.Mike

alsoreadtheentiremanuscriptandmademanysensiblecomments,someof

whichbroughtflightsoffancydowntoearth.JessamynReadturnedmanyfaxed

andemailedscratchingsofdubiouslegibilityintothequalityillustrationsyou

seeinthisbook.Andmany,manyothertalentedpeopleatO’Reillyhelpedput

thisbookintotheforminwhichyounowseeit.

Thecodeexamplesarenowdynamicallyincluded(soupdatesgetdonefaster)

ratherthanpastedin.Myson(andfunctionalprogrammingdeveloper)Benjamin

Darwinhelpedmeetthedeadlinebyconvertingalmosttheentirecodebaseto

O’Reilly’snewest“include”mechanismandbyresolvingacoupleofothernon-

Javapresentationissues.HealsohelpedmakeChapter9clearerandmore

functional.

AtO’Reilly

Forthisfourtheditionofthebook,SuzanneMcQuadewastheeditorialoverseer,

andCorbinCollinstheprincipaleditor.Corbinwasespeciallymeticulousin

checkingthemanuscript.MeghanBlanchette,SarahSchneider,AdamWitwer,

MelanieYarbrough,andthemanyproductionpeoplelistedontheCopyright

pageallplayedapartingettingthethirdeditionreadyforyoutoread.Thanksto

MikeLoukides,DebCameron,andMarloweShaefferforeditorialand

productionworkonthesecondedition.

TechnicalReviewers

ForthefourtheditionIwasblessedtohavetwoverythoroughtechnical

reviewers,SanderMakandDanielHinojosa.ManyissuesthatIhadn’t

consideredduringthemainrevisionwerecalledoutbythesetwo,leadingto

extensiverewritesandchangesinthelastfewweeksbeforetheO’Reilly

productionteamtookover.Thankssomuchtobothofyou!

Myreviewerforthethirdedition,AlexStangl,readthethirdeditionmanuscript

andwentfarabovethecallofduty,makinginnumerablehelpfulsuggestions,

evenfindingtyposthathadbeenpresentinpreviouseditions!Helpful

suggestionsonparticularsectionsweremadebyBenjaminDarwin,Mark

Finkov,andIgorSavin.ForanyoneI’veforgottentomention,Ithankyouall!

BilLewisandMikeSlinnmadehelpfulcommentsonmultipledraftsofthefirst

edition.RonHitchensandMarcLoycarefullyreadtheentirefinaldraftofthe

firstedition.IamgratefultoMikeLoukidesforhisencouragementandsupport

throughouttheprocess.EditorSueMillerhelpedshepherdthemanuscript

throughthesomewhatenergeticfinalphasesofproduction.SarahSlocomberead

theXMLchapterinitsentiretyandmademanylucidsuggestions;unfortunately,

timedidnotpermitmetoincludealloftheminthefirstedition.

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