大数据基础技能试题及答案.docx

大数据基础技能试题及答案.docx

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大数据基础技能试题及答案

Java基础

1.Whichofthefollowingwillcompilecorrectly?

A）floatf=10f;

B）floatf=10.1;

C）floatf=10.1f;

D）byteb=10b;

2.Whichdeclarationsofidentifiersarelegal

A.$persons

B.TwoUsers

C.*point

D.this

E._endline

3.Whichstatementofassigningalongtypevariabletoahexadecimalvalueiscorrect

A.longnumber=345L;

B.longnumber=0345;

C.longnumber=0345L;

D.longnumber=0x345L

4.Whichofthefollowingfragmentsmightcauseerrors

A.Strings="Gonewiththewind";

Stringt="good";

Stringk=s+t;

B.Strings="Gonewiththewind";

Stringt;

t=s[3]+"one";

C.Strings="Gonewiththewind";

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）{/*...*/}

4}}

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

D.static

18.Giventhefollowingcode:

if（x>0）{"first"）;}

elseif（x>-3）{"second"）;}

else{"third"）;}

Whichrangeofxvaluewouldprintthestring"second"

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}publicT