SSD3单选.docx
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SSD3单选
1.1.1
1.ThenameofaJavasourcefile（d）
（a）mustbethesameastheclassitdefines,ignoringcase
（b）mustusetheextension.class
（c）hasnorestrictions
（d）mustbethesameastheclassitdefines,respectingcase
2.WhichmethodmustexistineveryJavaapplication?
（a）
（a）main
（b）paint
（c）init
（d）begin
1.1.3
1.Giventhefollowingcode,howmanytokenswillbeoutput?
（b）
StringTokenizerst=newStringTokenizer（"thisisatest"）;
while（st.hasMoreTokens（））{
stdOut.println（st.nextToken（））;
}
（a）1（b）4（c）0（d）3
2.ClassesfromwhichofthefollowingpackagesareimplicitlyimportedintoeveryJavaprogram?
（d）
（a）java.awt
（b）java.io
（c）java.util
（d）java.lang
3.Whatisthenameofthewrapperclassforthetypeint?
（d）
（a）integer
（b）Int
（c）INT
（d）Integer
4.ClassesfromwhichofthefollowingpackagesareimplicitlyimportedintoeveryJavaprogram?
（c）
（a）java.util
（b）java.awt
（c）java.lang
（d）java.io
5.Thetermwrapperclassesrefersto（a）
（a）acollectionofJavaclassesthat"wrap"Javaprimitivetypes
（b）theJavaclassesthatcontainatleasttwodatafields
（c）theJavaclassesthatcontainthemselves
（d）acollectionofJavaclassesthatcontainotherJavaclasses
6.WhatwillbeoutputcausedbytheexecutionofthefollowingJavaprogramsegment?
（c）
Stringname="Elvis";
System.out.print（name+"washere"）;
（a）name+washere
（b）Elviswashere
（c）Elviswashere
（d）namewashere
1.1.4
1.WhatwillbeoutputwhenthefollowingJavaprogramsegmentisexecuted?
（c）
intx=5;
inty=2;
System.out.println（x+y）;
（a）52
（b）5+2
（c）7
（d）52
2.Adifferencebetweenthemethodsprintandprintlnoftheclassjava.io.PrintWriteristhat（a）
（a）printlnappendsanewlinetotheendofitsoutput,butprintdoesnot
（b）printappendsanewlinetotheendofitsoutput,butprintlndoesnot
（c）printlninsertsanewlineatthebeginningofitsoutput,butprintdoesnot
（d）printinsertsanewlineatthebeginningofitsoutput,butprintlndoesnot
3.ConsiderthefollowingJavaprogramsegment.（c）
intx=5;
inty=2;
System.out.println（x+"1"+y）;
Whichofthefollowingstatementsistrueabouttheprogramsegment?
（a）Theoutputcausedbythecodewillbe8.
（b）Theoutputcausedbythecodewillbe512.
（c）Theoutputcausedbythecodewillbe512.
（d）Thecodewillcauseacompilationerror.
1.1.5
1.AllJavaexceptionclassesarederivedfromtheclass（a）
（a）java.lang.Throwable
（b）java.lang.Error
（c）java.lang.RuntimeException
（d）java.io.IOException
2.InJava,exceptionsthatarenothandledarepassedupthe（b）
（a）exceptionladder
（b）callstack
（c）blockhierarchy
（d）catchblocks
3.WhatistherightwaytohandleabnormalitiesininputonJava?
（d）
（a）Bywritingwhileloopstoguardagainstbadinput
（b）ByalwaysspecifyingthethrowsclauseineverymethodheaderwherefileI/Oisperformed
（c）ByusingtheclassFileFilterwhichgracefullyfiltersoutbadinputdata
（d）Byhandlingtheseproblemsbyprovidingexceptionhandlers
4.ConsiderthefollowingJavaprogramsegment.
importjava.io.*;
publicclassSomeClass{
publicvoidx（）{
thrownewRuntimeException（"Exceptionfromx"）;
}
publicvoidy（）{
thrownewIOException（"Exceptionfromy"）;
}
}
Whichofthefollowingistrueconcerningthedefinitionsforthemethodsxandy?
（a）
（a）xhasalegaldefinition,butyhasanillegaldefinition.
（b）xhasanillegaldefinition,butyhasalegaldefinition.
（c）Neitherxnoryhasalegaldefinition.
（d）Bothxandyhavelegaldefinitions.
1.1.6
1.WhichofthefollowingstatementsistrueoftheconventionsoutlinedbySunMicrosystemsinthedocumententitledCodeConventionsfortheJavaProgrammingLanguage?
（d）
TheydefineastandardinterfacedefinitionlanguagethatmustbeusedforallJavaclasses.
Theyproviderecommendationsintendedtomakesourcecodeeasiertoreadandunderstand.
TheydescribeonemechanismfornetworkcommunicationbetweenJavaandC++programs.
（a）IIIonly
（b）IandIIIonly
（c）I,II,andIII
（d）IIonly
Feedback:
Seesection1.1.6,subsection"CodeConvTOC"andsection1.1,subsection"WhyHaveCodeConventions,"inthecoursenotes.
2.AccordingtotheJavacodeconventions,filesthatcontainJavasourcecodehavethesuffix_____,andcompiledbytecodefileshavethesuffix_____.（d）
（a）.class,.javac
（b）.javac,.class
（c）.class,.java
（d）.java,.class
Feedback:
Seesection1.1.6,subsection"CodeConvTOC"andsection2.1,subsection"FileSuffixes,"inthecoursenotes.
3.AccordingtothedocumententitledCodeConventionsfortheJavaProgrammingLanguage,filesuffixesusedbyJavasoftwareincludewhichofthefollowing?
（b）
.obj
.class
.h
（a）IandIIIonly
（b）IIonly
（c）IandIIonly
（d）IIandIIIonly
1.1.7
1.WhichofthefollowingpatternsofcharactersopensaJavadoccommentblock?
（b）
（a）/*
（b）/**
（c）**/
（d）//
1.1.8
1.Afteratypicaldebuggerencountersabreakpoint,theprogrammerusingthedebuggermayperformwhichofthefollowingactions?
（a）
Examinethevaluesofvariablesinthehaltedprogram
Executethecurrentline
Resumeexecutionofthehaltedprogram
（a）I,II,andIII
（b）IandIIonly
（c）Ionly
（d）IIIonly
2.Inatypicalsource-codedebugger,aprogrammercanseta_____tocauseaprogramtostopexecutingataparticularlineofcode.（c）
（a）testcase
（b）stacktrace
（c）breakpoint
（d）printstatement
3.Astacktraceis（b）
（a）alistofvariablesallocatedonaprogram'sstack
（b）asequenceofmethodcalls
（c）onlyavailablethroughatypicaldebugger'sstepintofeature
（d）afatalerrorthatcausesatypicaldebuggertoterminate
4.Atoolthatallowsprogrammerstoexecutelinesofaprogramonelineatatimeinordertohelplocatethesourceofaprogram'serrorsisknownasa（n）（b）
（a）stacktrace
（b）debugger
（c）scope
（d）exceptionhandler
1.1.
1．AccordingtoJavadocconvention,thefirstsentenceofeachJavadoccommentshouldbe（c）
（a）an@authortag
（b）an@versiontag
（c）asummarysentenceofthedeclaredentry
（d）theorderoflinesisnotimportant
Feedback:
Seeformoreinformation.
1.2.1
1.InaUMLclassdiagram'srepresentationofaclass,thetop,middle,andlowerrectangularcompartmentsrespectivelydescribethe_____oftheclass.（c）
（a）attributes,methods,andname
（b）attributes,methods,andconstants
（c）name,attributes,andmethods
（d）name,methods,andconstants
2.UMLclassdiagramscandescribewhichofthefollowing?
（b）
Theinternalstructureofclasses
Relationshipsbetweenclasses
（a）Ionly
（b）IandII
（c）None
（d）IIonly
1.2.2
1.ConsiderthefollowingUMLclassdiagram.
Accordingtothediagram,instancesoftheclassnamed_____havereferencestoinstancesoftheclassnamed_____.（a）
（a）A,B
（b）A,C
（c）B,A
（d）B,C
2.ConsiderthefollowingUMLclassdiagram.
Accordingtothediagram,whichofthefollowingstatementsistrue?
（a）
（a）ClassAiscomposedofoneinstanceofClassBandoneormoreinstancesofClassC.
（b）ClassBandClassCarebothsubclassesofClassA.
（c）ClassBhasaone-to-oneassociationwithClassAandaone-to-manyassociationwithClassC.
（d）ClassAandClassBeachcontainatleastonereferencetoaninstanceofClassC.
3.Abinaryassociationissaidtoexistbetweentwoclasseswhen（a）
（a）anobjectofoneclassrequiresanobjectoftheotherclass
（b）oneclassisasubtypeoftheotherclass
（c）anobjectofoneclassisinstantiatedinthesamemethodasanobjectoftheotherclass
（d）oneclassbelongstothesamepackageastheotherclass
4.Themultiplicityofanassociationbetweentwoclassesindicatesthenumberof（a）
（a）instancesofoneclassthatcanbeassociatedwithaninstanceoftheotherclass
（b）methodsofoneclassthatarecalledbytheotherclass
（c）methodsandvariablescommontobothclasses
（d）timesthatoneclass'smethodsarecalledbytheotherclass
5.WhichofthefollowingistrueaboutassociationandaggregationinUMLclassdiagrams?
（c）
（a）Associationisaspecialformofaggregation.
（b）Associationistheoppositeofaggregation.
（c）Aggregationisaspecialformofassociation.
（d）Associationandaggregationhavenomeaningfulrelationship.
1.2.3
1.Acollectiontypicallymodelsa_____relationship.（b）
（a）many-to-many
（b）one-to-many
（c）zero-to-one
（d）one-to-one
2.ConsiderthefollowingUMLclassdiagram.（c）
Thediagramdescribesa
（a）relationshipbetweenasubclassandasuperclass
（b）one-to-onerelationship
（c）self-containingclass
（d）classwithoutmethods
3.Considertheclassdescribedbythefollowingdiagram:
Iftheclassrepresentsanemployeeandthebossattributereferstotheemployee'sboss,whichofthefollowingstatementsis（are）true?
（c）
Manyemployeescanhavethesameboss.
Oneemployeecanhavemanybosses.
（a）IIonly
（b）None
（c）Ionly
（d）IandII
4.ConsiderthefollowingUMLclassdiagram.
Whichofthefollowingis（are）trueaboutthesystemdescribedbythediagram?
（d）
AninstanceofPicturecancontainacollectionofinstancesoftheclassShape.
AninstanceofShapecancontainacollectionofinstancesoftheclassPicture.
（a）IIonly
（b）IandII
（c）None
（d）Ionly
5.Ifaclasshasanassociationwithitself,thentheclasscontains（b）
（a）amethodthatcallsitself
（b）anattributethatreferencesanobjectofthesameclass
（
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