JAVA双语教学考试试A卷及答案docx.docx

JAVA双语教学考试试A卷及答案docx.docx

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JAVA双语教学考试试A卷及答案docx

注意事项：

请将各题答案按编号顺序填写到答题卷上，答在试卷上无效。

-、单项选择题（1~20每小题1分，21*30每小题2分，共40分）

Whichstatementofassigningalongtypevariabletoahexadecimalvalueiscorrect?

A.

0|P

g'曲4.

unI

5.

longnumber=345L;B.longnumber=0345;

C.longnumber=0345L;D.longnumber=0x345L;

Whichlayoutmanagerisusedwhentheframeisresizedthebuttons'spositionintheFramemightbechanged?

A.BorderLayoutB.FlowLayoutC.CardLayoutD.GridLayoutWhicharenotJavaprimitivetypes?

A.shortB.BooleanC.byteD.float

Giventhefollowingcode:

if（x>0）{System.out.println（"firstn）;}

elseif（x>-3）{System.out.println（MsecondH）;}

else{System.out.println（MthirdH）;}

Whichrangeofxvaluewouldprintthestringusecond11?

A.x>0B.x>-3C.x<=-3D.x<=0&x>-3

7.Giventhefollowingcode:

publicclassPerson{intarr||=newint|10];publicstaticvoidmain（Stringa|]）{

System.out.println（arr|11）;

Whichstatementiscorrect?

A.Whencompilationsomeerrorwilloccur.

B・Itiscorrectwhencompilationbutwillcauseerrorwhenrunning.

C.Theoutputiszero.

D.Theoutputisnull.

8.Shortanswer:

Thedecimalvalueofiis13,theoctalivalueis:

A.14B.015C.0x14D.012

9.ApublicmembervairablecalledMAX_LENGTHwhichisinttype,thevalueofthe

variableremainsconstantvalue100.Useashortstatementtodefinethevariable.

A.publicintMAX_LENGTH=100;B.finalintMAX_LENGTH=100;

C.finalpublicintMAX_LENGTH=100;D.publicfinalintMAX_LENGTH=100.

10.WhichcorrectlycreateanarrayoffiveemptyStrings?

A.Stringa[]=f"}；B.Stringa[5];C.String[5]a;

D.String[]a=newString[5];for（inti=0;i<5;a[i++]=null）;

11.Giventhefollowingmethodbody:

{if（sometest（））{

unsafe（）;

}else{

safe（）;

}

}

Themethod"unsafe”mightthrowanIOException（whichisnotasubclassofRunTimeException）.Whichcorrectlycompletesthemethodofdeclarationwhenaddedatlineone?

A.publicvoidmethodName（）throwsException

B・publicvoidmethodname（）

C.publicvoidmethodName（）throwIOException

D.publicIOExceptionmethodName（）

12.Whatwouldbetheresultofattemptingtocompileandrunthefollowingpieceofcode?

publicclassTest{staticintx;

publicstaticvoidmain（Stringargs[J）{

System.out.println（HValueis11+x）;

A.TheoutputnValueis0Hisprinted.

B.AnobjectoftypeNullPointerExceptionisthrown.

C.A"possiblereferencebeforeassignment11compilererroroccurs.

D.AnobjectoftypeArraylndexOutOfBoundsExceptionisthrown.

13.Whatisthereturn-typeofthemethodsthatimplementtheMouseListenerinterface?

A.booleanB・BooleanC.void

14.SelectvalididentifierofJava:

D.Point

A.#passB.3d_gameC.$charge

15.GivenaTextFieldthatisconstructedlikethis:

TextFieldt=newTextField（30）;

Whichstatementistrue?

A.Thedisplayedwidthis30columns.

D.this

B.Thedisplayedstringcanusemultiplefonts.

C.Thedisplayedlinewillshowexactlythirtycharacters.

D.Themaximumnumberofcharactersinalinewillbethirty.

16.WhichdeclaresanabstractmethodinanabstractJavaclass?

A.publicabstractmethod（）;B.publicabstractvoidmethod（）;

C.publicvoidabstractMethod（};D・publicabstractvoidmethod（）{}

17.WhathappenswhenthismethodiscalledwithaninputofnJavarules11?

1.publicStringaddOK（StringS）{

2.S+二”OK!

”；

3.returnS;

4.}

Selectonecorrectanswer

A.ThemethodwillreturnuJavarulesOK!

H.

bethrown.

C.Themethodwillreturn"OK!

”；

nJavarules11.

18.WhichofthefollowingareJavakeywords?

B.Aruntimeexceptionwill

D.Themethodwillreturn

A.arrayB.booleanC.IntegerD.Long

19.Assumethatvalhasbeendefinedasanintforthecodebelow.

if（val>4）{

System.out.println（HTestAn）;

}elseif（val>9）{

System.out.println（uTestBn）;

elseSystem.out.println（HTestCH）;

Whichvaluesofvalwillresultin”TestC”beingprinted:

A.val<4B.valbetween4and9C.val=10D.val>9

20.Whichofthefollowingarevaliddefinitionsofanapplication'smain（）method?

A.publicstaticvoidmain（）;B.publicstaticvoidmain（Stringargs）;

C.publicstaticvoidmain（Stringargs[]）;D.publicstaticvoid

main（Graphicsg）;

21.Afterthedeclaration:

char[]c=newchar[100];

whatisthevalueofc[50]?

A.50B.””C.‘\u0032’D.,\u0000,

22.Whichofthefollowingstatementsassigns"HelloJava”totheStringvariables?

A.Strings="HelloJava";B.Strings[]="HelloJava";

C.newStrings="HelloJava”；D.Strings[]=newString（"Hello

Java"）;

23.Ifarr[]containsonlypositiveintegervalues,whatdoesthisfunctiondo?

publicintguessWhat（intarr[]）{

intx=0;

for（inti=0;i

x=x

arr[i]:

x;

returnx;

}

A.Returnstheindexofthehighestelementinthearray

B・Returnstrue/falseifthereareanyelementsthatrepeatinthearray

C.Returnshowmanyevennumbersareinthearray

D.Returnsthehighestelementinthearray

24.Whichofthefollowingarelegaldeclarationsofatwo-dimensionalarrayofintegers?

A.int[5][5]a=newint[][];B.inta=newint[5,5];

C.inta[J[]=newint[5][5];D.int[][]a=new[5]int[5];

25.Ifval=1inthecodebelow:

switch（val）{

case1:

System.out.print（nPM）;

case2:

case3:

System.out.print（nQH）;

break;

case4:

System.out.print（nRn）;

default:

System.out.print（nSu）;

}

A.PB.PQC.QSD.PQRS

26.Giventhefollowingcode:

1.

publicclassTest{

2.

intm,n;

3.

publicTest（）{}

4.

publicTest（inta）{m=a;}

5.

publicstaticvoidmain（Stringarg[J）{

6.

Testtl,t2;

7.

intj,k;

&

j=0;k=0;

9.

tl=newTest（）;

10.

t2=newTest（j,k）;

11.

}

12.

}

Whichlinewouldcauseoneerrorduringcompilation?

A.line3B.line5C.line6D.line10

27.Forthecode:

m=0;

while（++m<2）

System.out.println（m）;

Whichofthefollowingareprintedtostandardoutput?

A.0B.1C.2D.3

28.Considerthefollowingcode:

Whatwillhappenwhenyoutrytocompileit?

publicclassInnerClass{

publicstaticvoidmain（String[Jargs）{}

publicclassMylnnerf}

}

A.Itwillcompilefine.

B・Itwillnotcompile,becauseyoucannothaveapublicinnerclass.

C.Itwillcompilefine,butyoucannotaddanymethods,becausethenitwillfailtocompile.

D.Itwillcompilefail.

29.Whatistheresultofexecutingthefollowingcode:

publicclassTest{

publicstaticvoidmain（Stringargs[]）{

Stringword二MrestructureM;

System.out.println（word.substring（2,5））;

}

}

A.restB.esC.strD.st

30.Whatwillbewrittentothestandardoutputwhenthefollowingprogramisrun?

publicclassTest{

publicstaticvoidmain（Stringargsfl）{

System.out.println（9A2）;

3LWhencallfact（3）,Whatistheresult?

intfact（intn）{

if（n<=l）return1;

else

returnn^fact（n-l）;

}

D.0

D.abed

A.2B.6C.3

32.Whatistheresultofexecutingthefollowingcode:

Strings=newString（HabcdefgH）;

for（inti=0;i

System.out.print（s.charAt（i））;

}

A.acegB.bdfC.abcdefg

33-Whatistheresultofexecutingthefollowingcode:

publicclassTest{

publicstaticvoidchangeStr（Stringstr）{str=nwelcomeH;

publicstaticvoidmain（String[]args）{Stringst—”12345”；changeStr（str）;

System.out.println（str）;

Pleasewritetheoutputresult:

A.welcomeB.12345C.welcomel2345D.12345welcome

34.Whatistheresultofexecutingthefollowingcode:

1.publicclassTest{

2.staticbooleanfoo（charc）{

3.System.out.print（c）;

4.returntrue;

5.}

6.publicstaticvoidmain（String[]argv）{

7.inti=0;

&for（foo（A）;foo（'B'）&&（i<2）;foo（C））{

9.i++;

10.foo（D）;

12.}

13.}

14.}

Whatistheresult?

A.ABDCBDCBB.ABCDABCD

C.Compilationfails.D.Anexceptionisthrownatruntime.

35.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?

publicfinalclassTest4{

classInner{

voidtest（）{

if（Test4.this.flag）;

else

sample（）;

}

}

privatebooleanflag=false;

publicvoidsample（）{

System.out.println（HSampleH）;

}

publicTest4（）{

（newInner（））.test（）;

publicstaticvoidmain（Stringargs[]）{newTest4（）;

Whatistheresult:

A.Printout"Sample^

B・Programproducesnooutputbuttermiantescorrectly.

C.Programdoesnotterminate.

D.Theprogramwillnotcompile

36.Whatistheresultofexecutingthefollowingfragmentofcode:

classBase{

Base（）{

amethod（）;

}

inti=100;

publicvoidamethod（）{

System.ou匚println（nBase.amethod（）H）;

}

}

publicclassDerivedextendsBase{

inti=-1;

publicstaticvoidmain（Stringargv[]）{Baseb=newDerived（）;

System.out.println（b.i）;b.amethod（）;

publicvoidamethod（）

System.out.println（HDerived.amethod（）n）;

A.Derived.amethod（）

Derived.amethod（）

C.100

Derived.amethod（）

B.Derived.amethod（）

100

Derived.amethod（）D.Compiletimeerror

publicclassTest{

Stringsl=nmenun;

publicstaticvoidmain（Stringargs[]）{intz=2;

Testt=newTest（）;

System.out.println（t.sl+z）;

38.Whatistheresultofexecutingthefollowingcode:

publicclassTestimplementsA{

intx=5;

publicstaticvoidmain（Stringargs[]）{

Testcl=newTest（）;

System.out.println（cl.x+A.k）;

}

}

interfaceA{

intk=10;

D.105

}

A.5B.10C.15

39-Whatistheresultofexecutingthefollowingcode:

importjava.util.Arrays;

publicclassTest{

publicstaticvoidmain（String[]unused）{

String[]str={"xxx”，”zzz",”yyy”,”aaa"};

Arrays.sort（str）;

intindex=Arrays.binarySearch（str,Hzzzn）;if（index==-l）

System.out.println（HnoH）;

else

System.out.println（HyesH）;

}

}

A.noB.xxxC.0D.yes

D.35

D.16

D.3

intb[][]={{2,3,4},{5,6},{7,8}};

intsum=O;

for（inti=O;ivb」ength;i++）{for（intj=O;j

}

}

System.out.println（',sum=,,4-sum）;

A.9B.11C.15

41.Whatistheresultofexecutingt