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面向?qū)ο蟪绦蛟O(shè)計(jì)知到智慧樹章節(jié)測(cè)試課后答案2024年秋齊魯工業(yè)大學(xué)第一章單元測(cè)試
WhicheditionofJavaisgearedtowarddevelopinglarge-scale,distributednetworkingapplicationsandweb-basedapplications?()
A:EnterpriseEdition.
B:IndustrialEdition.
C:StandardEdition.
D:MicroEdition.
答案:EnterpriseEdition.
Javawasoriginallydevelopedfor:()
A:Distributedcomputing.
B:Operatingsystemsdevelopment.
C:Personalcomputers.
D:Intelligentconsumerdevices.
答案:Intelligentconsumerdevices.
WhichofthefollowingstatementsaboutJavaClassLibrariesisfalse:()
A:Javaclasslibrariesconsistofclassesthatconsistofmethodsthatperformtasks.
B:AnadvantageofusingJavaclasslibrariesissavingtheeffortofdesigning,developingandtestingnewclasses.
C:JavaclasslibrariesarealsoknownasJavaAPIs(ApplicationProgrammingInterfaces).
D:Javaclasslibrariesarenotportable
答案:Javaclasslibrariesarenotportable
The.classextensiononafilemeansthatthefile:()
A:Containsjavasourcecode
B:Noneoftheabove.
C:ContainsHTML
D:isproducedbytheJavacompiler(javac).
答案:isproducedbytheJavacompiler(javac).
Thecommand________executesaJavaapplication.()
A:java
B:run
C:javac
D:Noneoftheabove
答案:java
第二章單元測(cè)試
End-of-linecommentsthatshouldbeignoredbythecompileraredenotedusing()
A:Threeforwardslashes(///).
B:Aslashandtwostars(/**).
C:Twoforwardslashes(//).
D:Aslashandastar(/*).
答案:Twoforwardslashes(//).
WhichofthefollowingisnotavalidJavaidentifier?()
A:width
B:myValue
C:$_AAA1
D:m_x
答案:myValue
WhichofthefollowingcannotcauseasyntaxerrortobereportedbytheJavacompiler?()
A:Mismatched{}
B:Missing;
C:Missing*/inacommentthatbeginswith/*
D:Anextrablankline.
答案:Anextrablankline.
Whichofthefollowingdoesnotcontainasyntaxerror?()
A:System.out.println("Helloworld!");
B:System.out.println('Helloworld!'):
C:System.out.println("Hello回車換行world!");
D:System.out.println(Helloworld!);
答案:System.out.println("Helloworld!");
WhichcommandcompilestheJavasourcecodefileWelcome.java?()
A:javacWelcome.java
B:compileWelcome.java
C:javaWelcome.java
D:cdWelcome.java
答案:javacWelcome.java
WhichcommandexecutestheJavaclassfileWelcome.class?()
A:javaWelcome.class
B:runWelcome.class
C:javawelcome
D:javaWelcome
答案:javaWelcome
Whichistheoutputofthefollowingstatements?
()
A:WorldHello
B:HelloWorld
C:HelloWorld
D:HelloWorld
答案:HelloWorld
Whichstatementprintsthefloating-pointvalue123.456rightjustifiedwithafieldwidthof10?()
A:System.out.printf("%d10.3",123.456);
B:System.out.printf("%10.3f",123.456);
C:System.out.printf("%f10.3",123.456);
D:System.out.printf("%10.3d",123.456);
答案:System.out.printf("%10.3f",123.456);
Whatisthesizeinbitsofanint?()
A:8
B:16
C:64
D:32
答案:32
Whichofthefollowingistheescapecharacter?()
A:\
B:"
C:*
D:\n
答案:\
第三章單元測(cè)試
Whichofthefollowingcanbeusedinaswitchstatementintheexpressionafterkeywordcase?a.aconstantintegralexpression.b.acharacterconstant.c.aStringd.anenumerationconstant.()
A:aandb.
B:bandc
C:aandc
D:All.
答案:All.
Optionalparenthesesinexpressionsaresaidtobe()
A:binaryoperators.
B:implied.
C:redundant.
D:declared.
答案:redundant.
Whichofthefollowingstatementsdoesnotalterthevaluestoredinamemorylocation?()
A:number=12;
B:width=Integer.parseInt(input);
C:inta;
D:y=y+2;
答案:inta;
WhatisthevalueofresultafterthefollowingJavastatementsexecute(assumeallvariablesareoftypeint)?
()
A:127
B:59
C:119
D:51
答案:119
Whichofthefollowingisnotanarithmeticoperator?()
A:-
B:%
C:.
D:+
答案:.
Whichofthefollowingisnotacompilationerror?()
A:Placingasemicolonattheendofthefirstlineofanifstatement.
B:Neglectingtoinitializealocalvariableinamethodbeforeitisused.
C:Omittingtheleftandrightparenthesisfortheconditionofanifstatement.
D:Allarecompilationerrors.
答案:Placingasemicolonattheendofthefirstlineofanifstatement.
Eachofthefollowingisarelationalorequalityoperatorexcept:()
A:>
B:<=
C:==
D:=!
答案:=!
Whichofthefollowingisnotacontrolstructure:()
A:Declarationstructure.
B:Sequencestructure.
C:Repetitionstructure.
D:Selectionstructure.
答案:Declarationstructure.
Whichstatementisfalse?()
A:Unlessdirectedotherwise,thecomputerexecutesJavastatementsoneaftertheotherintheorderinwhichthey'rewritten.
B:ActivitydiagramsnormallyshowtheJavacodethatimplementstheactivity.
C:Likepseudocode,activitydiagramshelpprogrammersdevelopandrepresentalgorithms.
D:Thearrowsintheactivitydiagramrepresenttransitions,whichindicatetheorderinwhichtheactionsrepresentedbytheactionstatesoccur.
答案:ActivitydiagramsnormallyshowtheJavacodethatimplementstheactivity.
Whichofthefollowingisadouble-selectioncontrolstatement?()
A:for
B:if
C:if…else
D:do…while
答案:if…else
第四章單元測(cè)試
Thenumberofargumentsinthemethodcallmustmatchthenumberofparametersinthemethoddeclaration’sparameterlist.()
A:錯(cuò)B:對(duì)
答案:對(duì)Floating-pointvaluesthatappearinsourcecodeareknownasfloating-pointliteralsandaretypefloatbydefault.()
A:對(duì)B:錯(cuò)
答案:錯(cuò)Eachclassyoucreatebecomesanew________thatcanbeusedtodeclarevariablesandcreateobjects.()
A:instance
B:package
C:library
D:type.
答案:type.
Whichofthefollowingstatementsisfalse?()
A:Everyclassdeclarationcontainskeywordclassfollowedimmediatelybytheclass’sname.
B:Class,methodandvariablenamesareidentifiers.
C:Eachclassdeclarationthatbeginswiththeaccessmodifierprivatemustbestoredinafilethathasthesamenameastheclassandendswiththe.javafilenameextension.
D:Anobjecthasattributesthatareimplementedasinstancevariablesandcarriedwithitthroughoutitslifetime.
答案:Eachclassdeclarationthatbeginswiththeaccessmodifierprivatemustbestoredinafilethathasthesamenameastheclassandendswiththe.javafilenameextension.
Whichofthefollowingstatementsisfalse?()
A:Byconventionclassnamesbeginwithanuppercaseletter,andmethodandvariablenamesbeginwithalowercaseletter.
B:Instancevariablescanbedeclaredanywhereinsideaclass.
C:Instancevariablesexistbeforemethodsarecalledonanobject,whilethemethodsareexecutingandafterthemethodscompleteexecution.
D:Aclassnormallycontainsoneormoremethodsthatmanipulatetheinstancevariablesthatbelongtoparticularobjectsoftheclass.
答案:Instancevariablescanbedeclaredanywhereinsideaclass.
Whichofthefollowingstatementsistrue?()
A:Variablesormethodsdeclaredwithaccessmodifierprivateareaccessibleonlytomethodsoftheclassinwhichthey’redeclared.
B:Eachobject(instance)oftheclasssharestheclass’sinstancevariables.
C:Noneoftheaboveistrue.
D:Mostinstance-variabledeclarationsareprecededwiththekeywordpublic,whichisanaccessmodifier.
答案:Variablesormethodsdeclaredwithaccessmodifierprivateareaccessibleonlytomethodsoftheclassinwhichthey’redeclared.
Whenamethodterminates,thevaluesofitslocalvariablesare________.()
A:saved
B:copied
C:restored
D:lost
答案:lost
Whichofthefollowingstatementsistrue?()
A:ThedefaultvalueforaninstancevariableoftypeStringisvoid.
B:Theargumenttypesinthemethodcallmustbeidenticaltothetypesofthecorrespondingparametersinthemethod’sdeclaration.
C:Everyinstancevariablehasadefaultinitialvalue—avalueprovidedbyJavawhenyoudonotspecifytheinstancevariable’sinitialvalue.
D:Localvariablesareautomaticallyinitialized.
答案:Everyinstancevariablehasadefaultinitialvalue—avalueprovidedbyJavawhenyoudonotspecifytheinstancevariable’sinitialvalue.
Whichofthefollowingstatementsisfalse?()
A:Theasterisk(*)injavac*.javaindicatesthatallfilesinthecurrentdirectoryendingwiththefilenameextension.javashouldbecompiled.
B:Alloftheabovearetrue.
C:Ifthedirectorycontainingtheappincludesonlyoneapp’sfiles,youcancompileallofitsclasseswiththecommandjavac*.java.
D:Thejavaccommandcancompilemultipleclassesatonce;simplylistthesource-codefilenamesafterthecommandwitheachfilenameseparatedbyacommafromthenext.
答案:Thejavaccommandcancompilemultipleclassesatonce;simplylistthesource-codefilenamesafterthecommandwitheachfilenameseparatedbyacommafromthenext.
Whichofthefollowingstatementsisfalse?()
A:IntheUML,eachclassismodeledinaclassdiagramasarectanglewiththreecompartments.Thetoponecontainstheclass’snamecenteredhorizontallyinboldface.Themiddleonecontainstheclass’sattributes,whichcorrespondtoinstancevariablesinJava.Thebottomonecontainstheclass’soperations,whichcorrespondtomethodsandconstructorsinJava.
B:PrivateattributesareprecededbythekeywordprivateintheUML.
C:TheUMLmodelsoperationsbylistingtheoperationnamefollowedbyasetofparentheses.Aplussign(+)infrontoftheoperationnameindicatesthattheoperationisapublic.
D:UMLrepresentsinstancevariablesasanattributename,followedbyacolonandthetype.
答案:PrivateattributesareprecededbythekeywordprivateintheUML.
Emptyparenthesesfollowingamethodnameinamethoddeclarationindicatethatthemethoddoesnotrequireanyparameterstoperformitstask.()
A:對(duì)B:錯(cuò)
答案:對(duì)Aprimitive-typevariablecanbeusedtoinvokeamethod.()
A:錯(cuò)B:對(duì)
答案:錯(cuò)Variablesdeclaredinthebodyofaparticularmethodareknownasinstancevariablesandcanbeusedinallmethodsoftheclass.()
A:錯(cuò)B:對(duì)
答案:錯(cuò)
第五章單元測(cè)試
Reference-typeinstancevariablesareinitializedbydefaulttothevaluenull.()
A:對(duì)B:錯(cuò)
答案:對(duì)Anyclassthatcontainspublicstaticvoidmain(String[]args)canbeusedtoexecuteanapp.()
A:對(duì)B:錯(cuò)
答案:對(duì)Whichofthefollowingstatementsisfalse?()
A:Everymethod’sbodyisdelimitedbyleftandrightbraces({and}).
B:Keywordnullindicatesthatamethodwillperformataskbutwillnotreturnanyinformation.
C:Variablesdeclaredinthebodyofaparticularmethodarelocalvariablesandcanbeusedonlyinthatmethod.
D:Amethod’sparametersarelocalvariablesofthemethod.
答案:Keywordnullindicatesthatamethodwillperformataskbutwillnotreturnanyinformation.
Whichofthefollowingstatementsisfalse?()
A:Emptyparenthesesfollowingamethodnameindicatethatthemethoddoesnotrequireanyparameterstoperformitstask.
B:Themethod’sreturntypespecifiesthetypeofdatareturnedtoamethod’scaller.
C:Whenamethodthatspecifiesareturntypeotherthanvoidiscalledandcompletesitstask,themethodmustreturnaresulttoitscallingmethod
D:Classesoftenprovidepublicmethodstoallowtheclass’sclientstosetorgetprivateinstancevariables;thenamesofthesemethodsmustbeginwithsetorget.
答案:Classesoftenprovidepublicmethodstoallowtheclass’sclientstosetorgetprivateinstancevariables;thenamesofthesemethodsmustbeginwithsetorget.
Whichofthefollowingstatementsisfalse?()
A:Tocallamethodofanobject,followtheobjectnamewithacomma,themethodnameandasetofparenthesescontainingthemethod’sarguments.
B:Scannermethodnextreadscharactersuntilanywhite-spacecharacterisencountered,thenreturnsthecharactersasaString.
C:Aclassinstancecreationexpressionbeginswithkeywordnewandcreatesanewobject.
D:Aconstructorissimilartoamethodbutiscalledimplicitlybythenewoperatortoinitializeanobject’sinstancevariablesatthetimetheobjectiscreated.
答案:Tocallamethodofanobject,followtheobjectnamewithacomma,themethodnameandasetofparenthesescontainingthemethod’sarguments.
Informationispassedtoamethodin________.()
A:themethodname
B:theargumentstothemethod
C:thatmethod’sreturn
D:themethodbody
答案:theargumentstothemethod
Awell-designedmethod________.()
A:repeatscodefoundinothermethods
B:performsmultipleunrelatedtasks
C:performsasingle,well-definedtask
D:containsthousandsoflinesofcode
答案:performsasingle,well-definedtask
Todeclareamethodasstatic,placethekeywordstaticbefore________inthemethod’sdeclaration.()
A:theargumentlist
B:themethodmodifier
C:thereturntype
D:themethodname
答案:thereturntype
WhichisacorrectstaticmethodcallofMathclassmethodsqrt?()
A:sqrt(900);
B:Mathmath=newMath();math.sqrt(900);
C:Math.sqrt(900);
D:math.sqrt(900);
答案:Math.sqrt(900);
WhichofthefollowingmethodsisnotintheMathclass?()
A:parseInt
B:abs
C:log
D:ceil
答案:parseInt
第六章單元測(cè)試
Mathstaticmethodrandomgeneratesarandomdoublevalueintherangefrom0.0()
A:uptobutnotincluding1.0
B:uptoandincluding100.0
C:uptobutnotincluding100.0
D:uptoandincluding1.0
答案:uptobutnotincluding1.0
Whichstatementcreatesarandomvaluefromthesequence2,5,8,11and14.SupposerandomNumbersisaSecureRandomobject.()
A:3+2*randomNumbers.nextInt(5);
B:2+5*randomNumbers.nextInt(3);
C:5+3*randomNumbers.nextInt(2);
D:2+3*randomNumbers.nextInt(5);
答案:2+3*randomNumbers.nextInt(5);
Asetofnamedconstantsthatstartwiththevalue0forthefirstconstantandincrementby1foreachsubsequentconstantcanbedeclaredasa(n)________.()
A:class
B:Noneoftheabove.
C:enumeration
D:enum
答案:enum
Arraysare________.()
A:variable-lengthentities
B:fixed-lengthentities
C:datastructuresthatcontainupto10relateddataitems
D:usedtodrawasequenceoflines,orrays
答案:fixed-lengthentities
TypesinJavaaredividedintotwocategories.Theprimitivetypesareboolean,byte,char,short,int,long,floatanddouble.Allothertypesare________types.()
A:reference
B:source
C:static
D:declared
答案:reference
Whichofthefollowingstatementsisfalse?()
A:Variablesoftypesbyte,short,int,long,floatanddoubleareinitializedto0.
B:Primitive-typeinstancevariablesareinitializedbydefault.
C:Variablesoftypebooleanareinitializedtotrue.
D:Aprimitive-typevariablecanstoreexactlyonevalueofitsdeclaredtypeatatime.
答案:Variablesoftypebooleanareinitializedtotrue.
Whichofthefollowingstatementsaboutarraysaretrue?
1:Anarrayisagroupofvariablescontainingvaluesthatallhavethesametype.
2:Elementsarelocatedbyindex.
3:Thelengthofanarraycisdeterminedbytheexpressionc.length();
4:Thezerothelementofarraycisspecifiedbyc[0].()
A:1,3,4
B:1,2,4
C:3,4
D:1,2,3,4
答案:1,2,4
Aprogrammermustdothefollowingbeforeusinganarray:()
A:declarethenreferencethearray.
B:createthenreferencethearray.
C:declarethencreatethearray.
D:createthendeclarethearray.
答案:declarethencreatethearray.
Considerthecodesegmentbelow.Whichofthefollowingstatementsisfalse?int[]g;g=newint[23];()
A:gisareferencetoanarrayofintegers.
B:Thefirststatementdeclaresanarrayreference.
C:Thevalueofg[3]is-1.
D:Thesecondstatementcreatesthearray.
答案:Thevalueofg[3]is-1.
Whichofthefollowingstatementsaboutcreatingarraysandinitializingtheirelementsisfalse?()
A:Whenanarrayiscreatedwithoperatornew,thenumberofelementsmustbeplacedinsquarebracketsfollowingthetypeofelementbeingstored.
B:Theelementsofanarrayofintegershaveavalueofnullbeforetheyareinitialized.
C:Thenewkeywordshouldbeusedtocreateanarray.
D:Aforloopiscommonlyusedtosetthevaluesoftheelementsofanarray.
答案:Theelementsofanarrayofintegershaveavalueofnullbeforetheyareinitialized.
Whichofthefollowinginitializerlistswouldcorrectlysettheelementsofarrayn?()
A:int[]n={1,2,3,4,5};
B:intn[5]={1;2;3;4;5};
C:arrayn[int]={1,2,3,4,5};
D:intn=newint(1,2,3,4,5);
答案:int[]n={1,2,3,4,5};
第七章單元測(cè)試
Whichofthefollowingstatementsisfalse?()
A:Asuperclassobjectisasubclassobject.
B:Javausesinterfacestoprovidethebenefitsofmultipleinheritance.
C:Asubclassisoftenlargerthanitssuperclass.
D:Theclassfollowingtheextendskeywordinaclassdeclarationisthedirectsuperclassoftheclassbeingdeclared.
答案:Asuperclassobjectisasubclassobject.
Inheritanceisalsoknownasthe()
A:is-arelationship.
B:uses-arelationship.
C:knows-arelationship.
D:has-arelationship.
答案:is-arelationship.
Whichofthefollowingisnotasuperclass/subclassrelationship?()
A:Noneoftheabove.
B:Employee/HourlyEmployee.
C:Sailboat/Tugboat.
D:Vehicle/Car.
答案:Sailboat/Tugboat.
Anadvantageofinheritanceisthat:()
A:Allmethodscanbeinherited.
B:Allinstancevariablescanbeuniformlyaccessedbysubclassesandsuperclasses.
C:Noneoftheabove.
D:Objectsofasubclasscanbetreatedlikeobjectsoftheirsuperclass.
答案:Objectsofasubclasscanbetreatedlikeobjectsoftheirsuperclass.
Whichofthefollowingkeywordsallowsasubclasstoaccessasuperclassmethodevenwhenthesubclasshasoverriddenthesuperclassmethod?()
A:super.
B:base.
C:public.
D:this.
答案:super.
Usingtheprotectedkeywordalsogivesamember:()
A:publicaccess.
B:privateaccess.
C:packageaccess.
D:blockscope.
答案:packageaccess.
Superclassmethodswiththislevelofaccesscannotbecalledfromsubclasses.()
A:public.
B:private.
C:protected.
D:package.
答案:private.
Whichofthefollowingstatementsisfalse?()
A:Aclass'sinstancevariablesarenormallydeclaredprivatetoenforcegoodsoftwareengineering.
B:It'softenmuchmoreefficienttocreateaclassbyinheritingfromasimilarclassthantocreatetheclassbywritingeverylineofcodethenewclassrequires.
C:AclasscandirectlyinheritfromclassObject.
D:Iftheclassyou'reinheritingfromdeclaresinstancevariablesasprivate,theinheritedclasscanaccessthoseinstancevariablesdirectly.
答案:Iftheclassyou'reinheritingfromdeclaresinstancevariablesasprivate,theinheritedclasscanaccessthoseinstancevariablesdirectly.
EveryclassinJava,except________,extendsanexistingclass.()
A:Object.
B:Integer.
C:Class.
D:String.
答案:Object.
Overridingamethoddiffersfromoverloadingamethodbecause:()
A:Overriddenmethodshavethesamesignature.
B:Neitheroftheabove.
C:Overloadedmethodshavethesamesignature.
D:Bothoftheabove.
答案:Overriddenmethodshavethesamesignature.
第八章單元測(cè)試
A(n)_____classcannotbeinstantiated.()
A:final.
B:abstract.
C:polymorphic.
D:concrete.
答案:abstract.
Non-abstractclassesarecalled________.()
A:implementableclasses.
B:realclasses.
C:concreteclasses.
D:instanceclasses.
答案:concreteclasses.
Ifthesuperclasscontainsonlyabstractmethoddeclarations,thesuperclassisusedfor________.()
A:Neither.
B:interfaceinheritance.
C:implementationinheritance.
D:Both.
答案:interfaceinheritance.
Whichofthefollowingcouldbeusedtodeclareabstractmethodmethod1inabstractclassClass1(method1returnsanintandtakesnoarguments)?()
A:publicintmethod1();
B:publicabstractintmethod1();
C:publicintnonfinalmethod1();
D:publicintabstractmethod1();
答案:public
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