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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Document preview page 1

Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 1

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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022)

Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) is your essential resource for acing certification exams with confidence.

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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 1 preview image
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 2 preview imageDownloadedfromStudyXY.com[=Ww+StudyXYoias.Za\Rr'BE\StudyAnythingThisContentHasbeenPostedOnStudyXY.comassupplementarylearningmaterial.StudyXYdoesnotendroseanyuniversity,collegeorpublisher.Allmaterialspostedareundertheliabilityofthecontributors.|8)www.studyxy.com
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 4 preview imageThePrincetonReviewPublishingTeamRobFranek,Editor-in-ChiefDavidSoto,SeniorDirector,DataOperationsStephenKoch,SeniorManager,DataOperationsDeborahWeber,DirectorofProductionJasonUllmeyer,ProductionDesignManagerJenniferChapman,SeniorProductionArtistSelenaCoppock,DirectorofEditorialAaronRiccio,SeniorEditorMeaveShelton,SeniorEditorChrisChimera,EditorOrionMcBean,EditorPatriciaMurphy,EditorLauraRose,EditorAlexaSchmittBugler,EditorialAssistantPenguinRandomHousePublishingTeamTomRussell,VP,PublisherAlisonStoltzfus,SeniorDirector,PublishingBrettWright,SeniorEditorEmilyHoffman,AssistantManagingEditorEllenReed,ProductionManagerSuzanneLee,DesignerEugeniaLo,PublishingAssistantThePrincetonReview110East42ndSt,7thFloorNewYork,NY10017Copyright©2022byTPREducationIPHoldings,LLC.Allrightsreserved.PublishedintheUnitedStatesbyPenguinRandomHouseLLC,NewYork.TermsofService:ThePrincetonReviewOnlineCompanionTools(“StudentTools”)forretailbooksareavailableforonlythetwomostrecenteditionsofthatbook.StudentToolsmaybeactivatedonlyoncepereligiblebookpurchasedforatotalof24monthsofaccess.ActivationofStudentToolsmorethanonceperbookisindirectviolationoftheseTermsofServiceandmayresultindiscontinuationofaccesstoStudentToolsServices.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 5 preview imageThematerialinthisbookisup-to-dateatthetimeofpublication.However,changesmayhavebeeninstitutedbythetestingbodyinthetestafterthisbookwaspublished.Ifthereareanyimportantlate-breakingdevelopments,changes,orcorrectionstothematerialsinthisbook,wewillpostthatinformationonlineintheStudentTools.RegisteryourbookandcheckyourStudentToolstoseeifthereareanyupdatespostedthere.ISBN9780593450727EbookISBN9780593451076APisatrademarkregisteredandownedbytheCollegeBoard,whichisnotaffiliatedwith,anddoesnotendorse,thisproduct.ThePrincetonReviewisnotaffiliatedwithPrincetonUniversity.Editor:SelenaCoppockProductionEditors:AliLandreau,KathyCarterProductionArtist:JenniferChapmanContentDevelopers:AnnHeltzelCoverartbySciencePhotoLibrary/AlamyStockPhotoCoverdesignbySuzanneLeeForcustomerservice,pleasecontacteditorialsupport@review.com,andbesuretoinclude:ofulltitleofthebook*ISBNepagenumbera_prh_6.0_140847919_c0_r0+Studyxy
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 6 preview imageAcknowledgmentsSpecialthankstoAnnHeltzelforhersuperbcontentdevelopmentworkonthe2023editionofthisbook.Additionally,ThePrincetonReviewwouldliketothankJenniferChapman,AliLandreau,andKathyCarterfortheircontributionstothistitle.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 7 preview imageContentsGetMore(Free)ContentPartI:UsingThisBooktoImproveYourAPScorePreview:YourKnowledge,YourExpectationsYourGuidetoUsingThisBookHowtoBeginPartll:PracticeTest1PracticeTest1PracticeTest1:DiagnosticAnswerKeyandExplanationsHowtoScorePracticeTest1Partlll:AbouttheAPComputerScienceAExamTheStructureoftheAPComputerScienceAExamHowAPExamsAreUsedOtherResourcesHaveYouHeardofAPComputerSciencePrinciples?InConclusionPartIV:Test-TakingStrategiesfortheAPComputerScienceAExamPreview1HowtoApproachMultiple-ChoiceQuestions2HowtoApproachFree-ResponseQuestions
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 8 preview imageReflectPartV:ContentReviewfortheAPComputerScienceAExam3PrimitiveTypesProgrammingStyleComments,Identifiers,WhiteSpaceCompiling&ErrorsObjects&PrimitiveDataOutput(andSomeInput)Variables&AssignmentTheFourDataTypes—int,double,boolean,charArithmeticOperationsKeyTermsChapter3ReviewDrillSummary4UsingClassesandObjectsThemathClassThestringsClassKeyTermsChapter4ReviewDrillSummary5BooleanExpressionsandIfStatementsThe1fStatementKeyTermsChapter5ReviewDrillSummary6Iteration
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 9 preview imageThewhileStatementTheForStatementKeyTermsChapter6ReviewDrillSummary7WritingClassesDesign&StructureMethodsCompositionReferencesStaticModifierKeyTermsChapter7ReviewDrillSummary8ArrayPrimitives&ObjectsSearchesSortsImplementationofaSelectionSortImplementationofanInsertionSortImplementationofaMergeSortKeyTermsChapter8ReviewDrillSummary9ArraylistLists&ArrayListsArraysversusArrayListChartKeyTerms
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 10 preview imageChapter9ReviewDrillSummary102DArrays2DArraysKeyTermsChapter10ReviewDrillSummary11InheritanceHierarchies&DesignPolymorphismKeyTermsChapter11ReviewDrillSummary12RecursionRecursionRecursivelyTraversingArraysKeyTermsChapter12ReviewDrillSummary13ChapterReviewDrillAnswersandExplanations14RequiredLabTimeandSuggestedLabsPartVI:PracticeTestsPracticeTest2PracticeTest2:AnswersandExplanationsHowtoScorePracticeTest2PracticeTest3PracticeTest3:AnswersandExplanations
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 11 preview imageHowtoScorePracticeTest3Glossary
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 12 preview image1GotoPrincetonReview.com/prepandenterthefollowingISBNforyourbook:97805934510762AnswerafewsimplequestionstosetupanexclusivePrincetonReviewaccount.(Ifyoualreadyhaveone,youcanjustlogin.)
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 13 preview image3EnjoyaccesstoyourFREEcontent!Needtoreportapotentialcontentissue?ContactEditorialSupport@review.comandinclude:
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 14 preview imagefulltitleofthebook*ISBN*pagenumberNeedtoreportatechnicalissue?ContactTPRStudentTech@review.comandprovide:«yourfullname«emailaddressusedtoregisterthebook«fullbooktitleandISBN*Operatingsystem(Mac/PC)andbrowser(Chrome,Firefox,Safari,etc.)Onceyou'veregistered,youcan...«Takeafull-lengthpracticeSATandACToAccessPracticeTest4plusdetailedAnswersandExplanations*Getvaluableadviceaboutthecollegeapplicationprocess,includingtipsforwritingagreatessayandwheretoapplyforfinancialaid«Ifyou'restillchoosingbetweencolleges,useoursearchablerankingsofTheBest388Collegestofindoutmoreinformationaboutyourdreamschool
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 15 preview image*AccesscomprehensivestudyguidesandavarietyofprintableresourcesincludingAPScoreConversioncharts,KeyTermslists,andtheGlossary«Checktoseeiftherehavebeenanycorrectionsorupdatestothisedition«GetourtakeonanyrecentorpendingupdatestotheAPComputerScienceAExamLookForTheseIconsThroughoutTheBookPROVENTECHNIQUESAPPLIEDSTRATEGIESSTUDYBREAKONLINEARTICLESOTHERREFERENCESONLINEVIDEOTUTORIALS
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 16 preview image
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 17 preview imagePartI
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 18 preview imageUsingThisBooktoImproveYourAPScorePreview:YourKnowledge.YourExpectations*YourGuidetoUsingThisBook*HowtoBegin
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 19 preview imagePREVIEW:YOURKNOWLEDGE,YOUREXPECTATIONSYourroutetoahighscoreontheAPComputerScienceAExamdependsalotonhowyouplantousethisbook.Startthinkingaboutyourplanbyrespondingtothefollowingquestions.1.RateyourlevelofconfidenceinyourknowledgeofthecontenttestedbytheAPComputerScienceAExam:A.Veryconfident—Iknowitall.B.I’mprettyconfident,buttherearetopicswithwhichIcouldusehelp.C.Notconfident—Ineedquiteabitofsupport.D.I’mnotsure.2.Ifyouhaveagoalscoreinmind,chooseitfortheAPComputerScienceAExam:54321I’mnotsureyet.3.Whatdoyouexpecttolearnfromthisbook?Chooseallthatapplytoyou.A.AgeneraloverviewofthetestandwhattoexpectB.StrategiesforhowtoapproachthetestC.ThecontenttestedbythisexamD.I’mnotsureyet.YOURGUIDETOUSINGTHISBOOKThisbookisorganizedtoprovideasmuch—oraslittle—supportasyouneed,soyoucanusethisbookinwhateverwaywillbemosthelpfultoimprovingyourscoreontheAPComputerScienceAExam.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 20 preview imageoTheremainderofPartIwillprovideguidanceonhowtousethisbookandhelpyoudetermineyourstrengthsandweaknesses.oPartIIofthisbookcontainsyourfirstpracticetest,aDiagnosticAnswerKey,detailedanswersandexplanationsforeachquestion,andascoringguide.Werecommendthatyoutakethistestbeforegoinganyfurtherinordertorealisticallydetermine:oyourstartingpointrightnowowhichquestiontypesyou'rereadyforandwhichyoumightneedtopracticeowhichcontenttopicsyouarefamiliarwithandwhichyoushouldreviewcarefullyOnceyouhavenaileddownyourstrengthsandweaknesseswithregardtothisexam,youcanfocusyourtestpreparation,buildastudyplan,andbeefficientwithyourtime.OurDiagnosticAnswerKeywillassistyouwiththisprocess.Bubblesheetsforthetestsinthisbookareavailableonline—youcanprintthemfromyouronlinestudenttools.Wehighlyrecommendthatyoudosobeforetakingapracticetest,aslearninghowtotransferyouranswerstoabubblesheetisanimportantpartofpreparingforthetest.oPartIIIofthisbookwill:oprovideinformationaboutthestructure,scoring,andcontentoftheAPComputerScienceAExamohelpyoutomakeastudyplanopointyoutowardadditionalresources
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 21 preview imageePartIVofthisbookwillexplorevariousstrategies,including:ohowtoattackmultiple-choicequestionsohowtoeffectivelyanswerfree-responsequestionsohowtomanageyourtimetomaximizethenumberofpointsavailabletoyouoPartVofthisbookcoversthecontentyouneedtoknowfortheAPComputerScienceAExam.ePartVIofthisbookcontainsPracticeTests2and3,plustheiranswersandexplanations,andascoringguide.(PracticeTest4anditsanswersandexplanationscanbefoundonline.)WerecommendthatyoupepperinPracticeTestsasyoustudyforyourexam.Don’ttakeallthePracticeTestsinaroworeveninrapidsuccession:startwithPracticeTest1togetasenseofwhereyouare.Then,asyoucompleteyourcontentreview,takeaPracticeTesteverysooftentoseehowyouaredoingandwhetheryouareimprovingorneedtoreviewcertaintopics.Youmaychoosetousesomepartsofthisbookoverothers,oryoumayworkthroughtheentirebook.Yourapproachwilldependonyourneedsandhowmuchtimeyouhave.Now,let’slookathowtomakethisdetermination.HOWTOBEGIN1.TakePracticeTest1Beforeyoucandecidehowtousethisbook,youneedtotakeapracticetest.Doingsowillgiveyouinsightintoyourstrengthsandweaknesses,andthetestwillalsohelpyoumakeaneffectivestudyplan.Ifyou'refeelingtest-phobic,remindyourselfthatapracticetestisatoolfordiagnosingyourself—it’snothowwellyoudothatmattersbuthowyouuseinformationgleanedfromyourperformancetoguideyourpreparation.+Studyxy
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 22 preview imageSo,beforeyoureadfurther,takePracticeTest1startingonthispageofthisbook.Besuretofinishitinonesitting,followingtheinstructionsthatappearbeforethetest.2.CheckYourAnswersUsingtheDiagnosticAnswerKeyonthispage,followourthree-stepprocesstoidentifyyourstrengthsandweaknesseswithregardtothetestedtopics.Thiswillhelpyoudeterminewhichcontentreviewchapterstoprioritizewhenstudyingthisbook.Don’tworryabouttheexplanationsfornow,anddon’tworryaboutmissedquestions.We’llgettothatsoon.BonusTipsandTricks...CheckusoutonYouTubefortest-takingtipsandtrickstohelpyouaceyournextexamatwww.youtube.com/ThePrincetonReview3.ReflectontheTestAfteryoutakeyourfirsttest,respondtothefollowingquestions:eHowmuchtimedidyouspendonthemultiple-choicequestions?eHowmuchtimedidyouspendoneachfree-responsequestion?*Howmanymultiple-choicequestionsdidyouanswercorrectlyandhowmanydidyoumiss?eDoyoufeelyouhadtheknowledgetoaddressthesubjectmatterofthefree-responsequestions?T=StudyXY
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 23 preview image4.ReadPartIIIofthisBookandCompletetheSelf-EvaluationPartIIIwillprovideinformationonhowthetestisstructuredandscored.Itwillalsosetoutareasofcontentthataretested.AsyoureadPartIII,re-evaluateyouranswerstothequestionsabove.AttheendofPartIII,youwillrevisitandrefinethosequestions.Youwillthenbeabletomakeastudyplan,basedonyourneedsandavailabletime,thatwillallowyoutousethisbookmosteffectively.5.EngagewithPartsIVandVasNeededNoticethewordengage.You’llgetmoreoutofthisbookifyouuseitintentionallythanifyoureaditpassively,hopingforanimprovedscorethroughosmosis.Thestrategychapterswillhelpyouthinkaboutyourapproachtothequestiontypesonthisexam.PartIVwillopenwitharemindertothinkabouthowyouapproachquestionsnowandthenclosewithareflectionsectionaskingyoutothinkabouthoworwhetheryouwillchangeyourapproachinthefuture.ThecontentchaptersinPartVaredesignedtoprovideareviewofthecontenttestedontheAPComputerScienceAExam,includingthelevelofdetailyouneedtoknowandhowthecontentistested.Inaddition,thecontentchaptersarebrokenuptoexactlymatchthe10-unitstructureoftheAPComputerScienceAcourse,asoutlinedbytheCollegeBoard.Youwillhavetheopportunitytoassessyourmasteryofthecontentofeachchapterthroughtest-appropriatequestionsandareflectionsection.6.TakePracticeTests2,3,and4andAssessYourPerformanceOnceyoufeelyouhavedevelopedthestrategiesyouneedandgainedtheknowledgeyoulacked,youshouldtakePracticeTest2,whichstarts
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 24 preview imageonthispageofthisbook.Youshoulddosoinonesitting,followingtheinstructionsatthebeginningofthetest.Whenyouarefinished,checkyouranswerstothemultiple-choicesections.Seewhetherateacherorfriendwillreadyourfree-responseanswers,providefeedback,andgooverthemwithyou.Onceyouhavetakenthetest,reflectontheareasonwhichyoustillneedwork,andrevisitthechaptersinthisbookthataddressthosedeficiencies.ThengobackandtakePracticeTest3anddothesame,thenPracticeTest4.Youhave4practicetestswiththisbook—besuretomakeuseofallofthem!(NotethatPracticeTest4isanonlinePDFfoundinyourStudentTools.Gobackafewpagesforstep-by-stepdirectionsonhowtoregisteryourbookandaccessallofyouronlineresources.)Ifyou'relookingforawaytogetthemostoutofyourstudying,checkoutourfreestudyguideforthisexam,whichyoucanaccessviayouronlinestudenttools.Seethe“GetMore(Free)Content”pagefordetailsonaccessingthisgreatresourceandmore.7.KeepWorkingAsmentionedearlier,thereareotherresourcesavailabletoyou,includingawealthofinformationontheAPStudentswebsite(apstudent.collegeboard.org/apcourse/ap-computer-science-a).Onthissite,youcancontinuetoexploreareasthatyoucouldimproveuponandengageinthoseareasrightupuntilthedayofthetest.Youshouldusea
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 25 preview imagemixofwebresourcesandbookreviewtosolidifyyourunderstandingofanyquestionsubjectsthatyoukeepgettingwrong.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 26 preview imagePartIIPracticeTest1*PracticeTest1«PracticeTest1:DiagnosticAnswerKeyandExplanations»HowtoScorePracticeTest1
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 27 preview imagePracticeTest1ClickheretodownloadaPDFofPracticeTest1.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 28 preview imageTheExamAP®ComputerScienceAExamSECTIONI:Multiple-ChoiceQuestionsDONOTOPENTHISBOOKLETUNTILYOUARETOLDTODOSO.AtaGlanceTotalTime1hour30minutesNumberofQuestions40PercentofTotalScore50%WritingInstrumentPencilrequiredInstructionsSectionIofthisexaminationcontains40multiple-choicequestions.Fillinonlytheovalsfornumbers1through40onyouranswersheet.Indicateallofyouranswerstothemultiple-choicequestionsontheanswersheet.Nocreditwillbegivenforanythingwritteninthisexambooklet,butyoumayusethebookletfornotesorscratchwork.Afteryouhavedecidedwhichofthesuggestedanswersisbest,completelyfillinthecorrespondingovalontheanswersheet.Giveonlyoneanswertoeachquestion.Ifyouchangeananswer,besurethatthepreviousmarkiserasedcompletely.Hereisasamplequestionandanswer.
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 29 preview imageSampleQuestionsChicagoisa(A)state(B)city(C)country(D)continent(E)countySampleAnswersUseyourtimeeffectively,workingasquicklyasyoucanwithoutlosingaccuracy.Donotspendtoomuchtimeonanyonequestion.Goontootherquestionsandcomebacktotheonesyouhavenotansweredifyouhavetime.Itisnotexpectedthateveryonewillknowtheanswerstoallthemultiple-choicequestions.AboutGuessingManycandidateswonderwhetherornottoguesstheanswerstoquestionsaboutwhichtheyarenotcertain.Multiple-choicescoresarebasedonthenumberofquestionsansweredcorrectly.Pointsarenotdeductedforincorrectanswers,andnopointsareawardedforunansweredquestions.Becausepointsarenotdeductedforincorrectanswers,youareencouragedtoanswerallmultiple-choicequestions.Onanyquestionsyoudonotknowtheanswerto,youshouldeliminateasmanychoicesasyoucan,andthenselectthebestansweramongtheremainingchoices.JavaQuickReferenceClassConstructors|ExplanationandMethodsStringClassString(StringConstructsanewStringobjectthatrepresentsthesamesequenceofcharacters+StudyXxy
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 30 preview imagestr)asstrintlength()ReturnsthenumberofcharactersinaStringobjectStringReturnsthesubstringbeginningatindexfromandendingatindexto-1substring(intfrom,intto)StringAReturnssubstring(from,length())substring(intfrom)intReturnstheindexofthefirstoccurrenceofstr;returns-1ifnotfoundindexof(Stringstr)booleanReturnstrueifthisisequaltoother;returnsfalseotherwiseequals(Stringother)intAReturnsavalue<0ifthisislessthanother;returnszeroifthisisequaltoSompareTo(Stringother;returnsavalue>0ifthisisgreaterthanotherIntegerClassSAConstructsanewIntegerobjectthatrepresentsthespecifiedintvaluevalueTheminimumvaluerepresentedbyanintorIntegerThemaximumvaluerepresentedbyanintorIntegerintintvalue()ReturnsthevalueofthisIntegerasanintDoubleClassTypes(dounteConstructsanewDoubleobjectthatrepresentsthespecifieddoublevaluevaluedoubleReturnsthevalueofthisDoubleasadoubledoublevalue()MathClassstaticintReturnstheabsolutevalueofanintvalueabs(intx)staticdoubleReturnstheabsolutevalueofadoublevalueabs(doublex)NPdoubleReturnsthevalueofthefirstparameterraisedtothepowerofthesecondpow(doublebase,doubleexponent)parameterstaticdoubleReturnsthepositivesquarerootofadoublevaluesqrt(doublex)staticdoubleReturnsadoublevaluegreaterthanorequalto6.0andlessthan1.0random()ArrayListClassReturnsthenumberofelementsinthelistaadd(EAppendsobjtoendoflist;returnstrueobj|’1StudyXY
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Princeton Review AP Computer Science A Prep, 2023: 4 Practice Tests + Complete Content Review (2022) - Page 31 preview imagevoidadd(intInsertsobjatpositionindex(6<=index<=size),movingelementsatindex,Eobj)positionindexandhighertotheright(adds1totheirindices)andadds1tosizeEget(intindex)|ReturnstheelementatpositionindexinthelistEset(intindex,|Replacestheelementatpositionindexwithobj;returnstheelementformerlyEobj)atpositionindexEremove(intRemoveselementfrompositionindex,movingelementsatpositionindex+1index)andhighertotheleft(subtracts1fromtheirindices)andsubtracts1fromsize;returnstheelementformerlyatpositionindexObjectClassbooleanequals(Objectother)StringtoString()T=StudyXY
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