Java英文题2.docx
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Java英文题2
Multiple-Choice
1.ThenameofaJavasourcefiled
（a）hasnorestrictions
（b）mustbethesameastheclassitdefines,ignoringcase
（c）mustusetheextension.class
（d）mustbethesameastheclassitdefines,respectingcase
2.Whichofthefollowingstatementsis（are）trueabouttheuseofanasterisk（*）inaJavaimportstatement?
b
Ⅰ.Itdoesnotincurrun-timeoverhead.
Ⅱ.Itcanbeusedtoimportmultiplepackageswithasinglestatement.
Ⅲ.Itcanbeusedtoimportmultipleclasseswithasinglestatement
（a）I,II,andIII（b）IandIIIonly（c）Ionly（d）IIIonly
3.Whatisthenameofthewrapperclassforthetypeint?
c
（a）INT（b）integer（c）Integer（d）Int
4.Adifferencebetweenthemethodsprintandprintlnoftheclassjava.io.PrintWriteristhatd
（a）printlninsertsanewlineatthebeginningofitsoutput,butprintdoesnot
（b）printinsertsanewlineatthebeginningofitsoutput,butprintlndoesnot
（c）printappendsanewlinetotheendofitsoutput,butprintlndoesnot
（d）printlnappendsanewlinetotheendofitsoutput,butprintdoesnot
5.ConsiderthefollowingJavaprogramsegment.a
intx=5;inty=2;
System.out.println（x+"1"+y）;
Whichofthefollowingstatementsistrueabouttheprogramsegment?
（a）Theoutputcausedbythecodewillbe512.
（b）Theoutputcausedbythecodewillbe512.
（c）Theoutputcausedbythecodewillbe8.
（d）Thecodewillcauseacompilationerror.
6.AllJavaexceptionclassesarederivedfromtheclassb
（a）java.lang.RuntimeException
（b）java.lang.Throwable
（c）java.lang.Error
（d）java.io.IOException
7.WhatistherightwaytohandleabnormalitiesininputonJava?
b
（a）Bywritingwhileloopstoguardagainstbadinput
（b）Byhandlingtheseproblemsbyprovidingexceptionhandlers
（c）ByusingtheclassFileFilterwhichgracefullyfiltersoutbadinputdata
（d）ByalwaysspecifyingthethrowsclauseineverymethodheaderwherefileI/Oisperformed
8.WhichofthefollowingpatternsofcharactersopensaJavadoccommentblock?
c
（a）/*（b）**/（c）/**（d）//
9.AccordingtotheJavacodeconventions,filesthatcontainJavasourcecodehavethesuffix_____,andcompiledbytecodefileshavethesuffix_____.c
（a）.class,.java（b）.class,.javac
（c）.java,.class（d）.javac,.class
10.AsanaidindebuggingaprograminJava,printstatementsmaybeusedtodisplaywhichofthefollowingtypesofinformation?
d
I.Thenamesofmethodsbeingcalled
II.Thevaluesoftheparametersofamethod
Ⅲ.Thevaluesoftheinstancevariablesofaclass
（a）IandIIonly（b）IandIIIonly
（c）IIandIIIonly（d）I,II,andIII
1.InaUMLclassdiagram'srepresentationofaclass,thetop,middle,andlowerrectangularcompartmentsrespectivelydescribethe_____oftheclass.a
（a）name,attributes,andmethods（b）name,methods,andconstants
（c）attributes,methods,andname（d）attributes,methods,andconstants
2.UMLclassdiagramscandescribewhichofthefollowing?
a
I.Theinternalstructureofclasses
Ⅱ.Relationshipsbetweenclasses
（a）IandII（b）IIonly（c）None（d）Ionly
3.ConsiderthefollowingUMLclassdiagram.b
Accordingtothediagram,instancesoftheclassnamed_____havereferencestoinstancesoftheclassnamed_____.b
（a）B,A（b）A,C（c）B,C（d）A,B
4.WhichofthefollowingistrueaboutassociationandaggregationinUMLclassdiagrams?
b
（a）Associationistheoppositeofaggregation.
（b）Aggregationisaspecialformofassociation.
（c）Associationisaspecialformofaggregation.
（d）Associationandaggregationhavenomeaningfulrelationship.
?
?
5.Abinaryassociationissaidtoexistbetweentwoclasseswhenb
（a）oneclassbelongstothesamepackageastheotherclass
（b）anobjectofoneclassrequiresanobjectoftheotherclass
（c）anobjectofoneclassisinstantiatedinthesamemethodasanobjectoftheotherclass
（d）oneclassisasubtypeoftheotherclass
6.ConsiderthefollowingUMLclassdiagram.
Accordingtothediagram,whichofthefollowingstatementsis（are）true?
c
I.ClassBisaspecializationofClassA.
II.ClassAisageneralizationofClassC.
Ⅲ.ClassCisinvolvedinaself-containmentloop.
（a）IIandIIIonly（b）IandIIonly
（c）I,II,andIII（d）IandIIIonly
7.Acollectiontypicallymodelsa_____relationship.d
（a）one-to-one（b）many-to-many（c）zero-to-one（d）one-to-many
8.ConsiderthefollowingUMLclassdiagram.
Whichofthefollowingis（are）trueaboutthesystemdescribedbythediagram?
c
I.AninstanceofPicturecancontainacollectionofinstancesoftheclassShape.
Ⅱ.AninstanceofShapecancontainacollectionofinstancesoftheclassPicture.
（a）IIonly（b）None（c）Ionly（d）IandII
9.Whenusingnoun-phraseanalysistomodelasoftwaresystem,whichofthefollowingshouldtypicallybeeliminatedfromthelistofpotentialclasses?
I.Referencestothesoftwaresystemitself
II.Nounsthatimplyrolesbetweenobjects
Ⅲ.Synonymstoothernounsinthelist
（a）IIandIIIonly（b）IandIIIonly
（c）IIIonly（d）I,II,andIII
10.Thestaticmodelofasoftwaresystemtypicallyincludeswhichofthefollowing?
a
I.Attributesofclasses
II.Actionsthatoccurbetweenclasses
Ⅲ.Structuralrelationshipsbetweenclasses
（a）IandIIIonly（b）IIandIIIonly
（c）I,II,andIII（d）IandIIonly
1.Thetermclassvariableisasynonymford
（a）aprivatedatafield
（b）astaticdatafield
（c）aread-onlyvariable
（d）aninstancevariable
2.ConsiderthefollowingJavaprogramsegment.c
importjava.io.*;
publicclassTest{
publicTest（）{
System.out.println（"default"）;
}
publicTest（inti）{
System.out.println（"non-default"）;
}
publicstaticvoidmain（String[]args）{
Testt=newTest
（2）;
}
}
Whichofthefollowingwillbeoutputduringexecutionoftheprogramsegment?
（a）Thelineoftext"default"
（b）Thelineoftext"default"followedbythelineoftext"non-default"
（c）Thelineoftext"non-default"
（d）Thelineoftext"non-default"followedbythelineoftext"default"
3.WhichofthefollowingcategorizationscanbeappliedtoboththedatafieldsandthemethodsinaJavaclass?
c
（a）nativeandnon-native
（b）defaultandnon-default
（c）staticandnon-static
（d）abstractandnon-abstract
4.WhichofthefollowingstatementsaboutclassvariablesinJavaisnottrue?
c
（a）Classvariablesrequirethemodifierstaticinthedeclarations.
（b）Allobjectshavetheirowncopyoftheclassvariabledefinedintheinstantiatedclass.
（c）Non-staticmethodsinaclasscanaccesstheclassvariabledefinedinthesameclass.
（d）Classvariablesdonotneedthereferencetotheobjectoftheinstantiatedclasstoaccessthem.
5.Ifaclasscontainsaconstructor,thatconstructorwillbeinvokedb
（a）eachtimeanobjectofthatclassgoesoutofscope
（b）eachtimeanobjectofthatclassisinstantiated
（c）oncethefirsttimeanobjectofthatclassisinstantiated
（d）onceatthebeginningofanyprogramthatusesthatclass
6.WhichofthefollowingstatementsaboutconstructorsinJavaistrue?
a
（a）Aclasscandefinemorethanoneconstructor.
（b）Aconstructormustbedefinedaspublic.
（c）Aconstructormustbedefinedasstatic.
（d）Aclassmustdefineatleastoneconstructor.
7.Ifthemethodintsum（inta,intb）isdefinedinaJavaclassC,whichofthefollowingmethodscannotcoexistasadifferentmethodinclassC?
c
（a）intsum（intx,floaty）
（b）intsum（floata,intb）
（c）intsum（intx,inty）
（d）floatsum（intx,floaty）
8.ConsiderthefollowingJavaclassdefinitions.
publicclassObject1{
protectedStringd（）{
return"Hi";
}
}
publicclassObject2extendsObject1{
protectedStringd（）{
returnsuper.d（）;
}
}
Whichofthefollowingstatementsis（are）trueregardingthedefinitions?
a
I.ClassObject2inheritsfromclassObject1.
II.ClassObject2overridesmethodd.
Ⅲ.Methoddreturnsequivalentresultswhenexecutedfromeitherclass.
（a）I,II,andIII（b）IandIIIonly
（c）IIIonly（d）IandIIonly
9.Whenasubclassdefinesaninstancemethodwiththesamereturntypeandsignatureasamethodinitsparent,theparent'smethodissaidtobed
（a）private（b）hidden（c）overloaded（d）overridden
10.WhichisaJavaaccessmodifierusedtodesignatethataparticulardatafieldwillnotbeinheritedbyasubclass?
（a）final（b）protected（c）private（d）default
1.ConsiderthefollowingJavaprogramsegment.
String[]str={"Three","Two","One"};
for（inti=0;iSystem.out.println（str[i]+"/"）;
}
Whatwillbeoutputuponexecutionoftheprogramsegment?
a
（a）Three/Two/One/（b）Three,Two,One
（c）One,Two,Three（d）One/Two/Three/
2.ConsiderthefollowingJavaprogramsegment.a
int[]arr;
arr=newint[3];
arr[2]=19;
arr[1]=17;
arr[0]=15;
WhichofthefollowingJavastatementsissyntacticallycorrectandsemanticallyidenticaltotheprogramsegment?
（a）int[]arr={15,17,19};
（b）int[3]arr={15,17,19};
（c）intarr={15,17,19};
（d）intarr[3]={15,17,19};
3.Regardingthefollowingdeclaration,whatistheindexoftheelementcontaining45?
bint[]numbers={-1,45,6,132};
（a）0（b）1（c）45（d）2
4．LegalJavastatementstoinitializeanarrayreferenceincludewhichofthefollowing?
d
I.int[]aobj={0,1,2};
II.int[4]aobj={0,1,2};
Ⅲ.int[]aobj=newint[3];
（a）IandIIonly（b）Ionly
（c）IIIonly（d）IandIIIonly
5.IfthelengthofaparticulararrayisthevalueofLIMIT,whatistheindexofthelastiteminthatarray?
b
（a）LIMIT（b）LIMIT–1（c）LIMIT/2（d）0
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