大数据基础技能试题及答案Word文档格式.docx

大数据基础技能试题及答案Word文档格式.docx

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C.Strings="

Stringstandard=s.toUpperCase（）;

D.Strings="

homedirectory"

Stringt=s-"

directory"

5.Whicharesyntacticallyvalidstatementat//pointx

classPerson{

privateinta;

publicintchange（intm）{returnm;

}

}

publicclassTeacherextendsPerson{

publicintb;

publicstaticvoidmain（Stringarg[]）{

Personp=newPerson（）;

Teachert=newTeacher（）;

inti;

//pointx

A.i=m;

B.i=b;

C.i=p.a;

D.i=p.change（30）;

E.i=t.b.

6.Whichlayoutmanagerisusedwhentheframeisresizedthebuttons'

spositionintheFramemightbechanged

A.BorderLayout

B.FlowLayout

C.CardLayout

D.GridLayout

7.Giventhefollowingcodefragment:

1）publicvoidcreate（）{

2}VectormyVect;

3}myVect=newVector（）;

4}}

Whichofthefollowingstatementsaretrue

A.Thedeclarationonline2doesnotallocatememoryspaceforthevariablemyVect.

B.Thedeclarationonline2allocatesmemoryspaceforareferencetoaVectorobject.

C.Thestatementonline2createsanobjectofclassVector.

D.Thestatementonline3createsanobjectofclassVector.

E.Thestatementonline3allocatesmemoryspaceforanobjectofclassVector

8.Whichofthefollowingansweriscorrecttoexpressthevalue8inoctalnumber

A.010

B.0x10

C.08

D.0x8

9.WhicharenotJavakeywords

A.TRUE

B.sizeof

C.const

D.super

E.void

10.Whichofthefollowingstatementsaretrue

A.Theequals（）methoddeterminesifreferencevaluesrefertothesameobject.

B.The==operatordeterminesifthecontentsandtypeoftwoseparateobjectsmatch.

C.Theequals（）methodreturnstrueonlywhenthecontentsoftwoobjectsmatch.

D.TheclassFileoverridesequals（）toreturntrueifthecontentsandtypeoftwoseparateobjectsmatch.

11.Whichstatementsaboutinheritancearetrue

A.InJavaprogramminglanguageonlyallowssingleinheritance.

B.InJavaprogramminglanguageallowsaclasstoimplementonlyone

interface.

C.InJavaprogramminglanguageaclasscannotextendaclassandimplement

ainterfacetogether.

D.InJavaprogramminglanguagesingleinheritancemakescodemore

reliable.

12.

1）classPerson{

2}publicvoidprintValue（inti,intj）{/*…*/}

3}publicvoidprintValue（inti）{/*...*/}

5）publicclassTeacherextendsPerson{

6}publicvoidprintValue（）{/*...*/}

7}publicvoidprintValue（inti）{/*...*/}

8}publicstaticvoidmain（Stringargs[]）{

9}Persont=newTeacher（）;

10}t.printValue（10）;

11}}

12}}

Whichmethodwillthestatementonline10call

A.online2

B.online3

C.online6

D.online7

13.WhicharenotJavaprimitivetypes

A.short

B.Boolean

C.unit

D.float

14、Themethodresume（）isresponsibleforresumingwhichthread'

sexecution

　　A.Thethreadwhichisstoppedbycallingmethodstop（）

　　B.Thethreadwhichisstoppedbycallingmethodsleep（）

　　C.Thethreadwhichisstoppedbycallingmethodwait（）\

　　D.Thethreadwhichisstoppedbycallingmethodsuspend（）

15.Whichofthefollowingrangeofintiscorrect

A.-2^7–2^7-1

B.0–2^32-1

C.-2^15–2^15-1

D.-2^31–2^31-1

16.Whichkeywordshouldbeusedtoenableinteractionwiththelockofan

objectTheflagallowsexclusiveaccesstothatobject.

A.transient

B.synchronized

C.serialize

D.static

17.Whichisthereturntypeofthemethodmain（）

A.int

B.void

C.boolean

18.Giventhefollowingcode:

if（x>

0）{System.out.println（"

first"

）;

elseif（x>

-3）{System.out.println（"

second"

else{System.out.println（"

third"

Whichrangeofxvaluewouldprintthestring"

A.x>

0

B.x>

-3

C.x<

=-3

D.x<

=0&

x>

-3

19、Whichofthefollowingansweriscorrecttoexpressthevalue10inhexadecimalnumber

　　A.0xA

　　B.0x16

　　C.0A

　　D.016

20.Whichstatementsaboutthegarbagecollectionaretrue

A.Theprogramdevelopermustcreateathreadtoberesponsibleforfree

thememory.

B.Thegarbagecollectionwillcheckforandfreememorynolongerneeded.

C.Thegarbagecollectionallowtheprogramdevelopertoexplicityand

immediatelyfreethememory.

D.Thegarbagecollectioncanfreethememoryusedjavaobjectatexpect

time.

21、Giventhefollowingcode:

　　1）publicclassTest{

　　2}intm,n;

　　3}publicTest（）{}

　　4}publicTest（inta）{m=a;

　　5}publicstaticvoidmain（Stringarg[]）{

　　6}Testt1,t2;

　　7}intj,k;

　　8}j=0;

k=0;

　　9}t1=newTest（）;

　　10}t2=newTest（j,k）;

　　11}}

12}}

　　Whichlinewouldcauseoneerrorduringcompilation

　　A.line3

　　B.line5

　　C.line6

　　D.line10

22、Giventheuncompletedcodeofaclass:

　　classPerson{

　　Stringname,department;

　　intage;

　　publicPerson（Stringn）{name=n;

　　publicPerson（Stringn,inta）{name=n;

age=a;

　　publicPerson（Stringn,Stringd,inta）{

　　//doingthesameastwoargumentsversionofconstructor

　　//includingassignmentname=n,age=a

　　department=d;

　　}

　　Whichexpressioncanbeaddedatthe"

doingthesameas..."

partoftheconstructor

　　A.Person（n,a）;

　　B.this（Person（n,a））;

　　C.this（n,a）;

　　D.this（name,age）.

23、Whichofthefollowingstatementsaboutvariablesandtheirscopesaretrue

　　A.Instancevariablesaremembervariablesofaclass.

　　B.Instancevariablesaredeclaredwiththestatickeyword.

　　C.Localvariablesdefinedinsideamethodarecreatedwhenthemethodisexecuted.

　　D.Localvariablesmustbeinitializedbeforetheyareused.

24、publicvoidtest（）{

　　try{oneMethod（）;

　　System.out.println（"

condition1"

　　}catch（ArrayIndexOutOfBoundsExceptione）{

condition2"

　　}catch（Exceptione）{

condition3"

　　}finally{

finally"

　　}

　　WhichwilldisplayifoneMethodrunnormally

　　A.condition1

　　B.condition2

　　C.condition3

　　D.finally

25、Giventhefollowingcode:

　　publicclassTest{

　　voidprintValue（intm）{

　　do{System.out.println（"

Thevalueis"

+m）;

　　while（--m>

10）

　　publicstaticvoidmain（Stringarg[]）{

　　inti=10;

　　Testt=newTest（）;

　　t.printValue（i）;

　　Whichwillbeoutput

　　A.Thevalueis8

B.Thevalueis9

　　C.Thevalueis10

　　D.Thevalueis11

26、Whichofthefollowingstatementsaboutdeclarationaretrue

　　A.Declarationofprimitivetypessuchasboolean,byteandsoondoesnotallocatememoryspaceforthevariable.

　　B.Declarationofprimitivetypessuchasboolean,byteandsoonallocatesmemoryspaceforthevariable.

　　C.DeclarationofnonprimitivetypessuchasString,Vectorandsoondoesnotallocatememoryspacefortheobject.

　　D.DeclarationofnonprimitivetypessuchasString,Vectoranssoonallocatesmemoryspacefortheobject.

27、IntheJavaAPIdocumentationwhichsectionsareincludedinaclassdocument

A.Thedescriptionoftheclassanditspurpose

　　B.Alistofmethodsinitssuperclass

　　C.Alistofmembervariable

　　D.Theclasshierarchy

28、Giventhefollowingcode:

　　1）publicvoidmodify（）{

　　2）inti,j,k;

　　3）i=100;

　　4）while（i>

0）{

　　5）j=i*2;

6）System.out.println（"

Thevalueofjis"

+j）;

　　7）k=k+1;

　　8）i--;

　　9）}

　　10}}

Whichlinemightcauseanerrorduringcompilation

　　A.line4

　　B.line6

　　C.line7

　　D.line8

29、Whichofthefollowingstatementsaboutvariablesandscopearetrue

　　A.Localvariablesdefinedinsideamethodaredestroyedwhenthemethodisexited.

　　B.Localvariablesarealsocalledautomaticvariables.

C.Variablesdefinedoutsideamethodarecreatedwhentheobjectisconstructed.

　　D.Amethodparametervariablecontinuestoexistforaslongastheobjectisneededinwhichthemethodisdefined.

30、Aclassdesignrequiresthatamembervariablecannotbeaccessibledirectlyoutsidetheclass.Whichmodifiershouldbeusedtoobtaintheaccesscontrol

　　A.public

　　B.nomodifier

　　C.protected

　　D.private

31、Giventhefollowingcodefragment:

　　1）Stringstr=null;

　　2）if（（str!

=null）&

&

（str.length（）>

10））{

　　3}System.out.println（"

morethan10"

　　4}}

　　5）elseif（（str!

（str.length（）<

5））{

　　6}System.out.println（"

lessthan5"

　　7}}

　　8）else{System.out.println（"

end"

　　Whichlinewillcauseerror

　　A.line1

　　B.line2

　　C.line5

32、WhichstatementsaboutJavacodesecurityaretrue

　　A.Thebytecodeverifierloadsallclassesneededfortheexecutionofaprogram.

　　B.Executingcodeisperformedbytheruntimeinterpreter.

　　C.Atruntimethebytecodesareloaded,checkedandruninaninterpreter.

　　D.Theclassloaderaddssecuritybyseparatingthenamespacesfortheclassesofthelocalfilesystemfromthoseimportedfromnetworksources.

33、Giventhefollowingcode:

　　publicclassPerson{

　　intarr[]=newint[10];

　　publicstaticvoidmain（Stringa[]）{

　　System.out.println（arr[1]）;

　　Whichstatementiscorrect

　　A.Whencompilationsomeerrorwilloccur.

　　B.Itiscorrectwhencompilationbutwillcauseerrorwhenrunni