SCJP模拟试题.docx

SCJP模拟试题.docx

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SCJP模拟试题

Question1

Given:

11.publicinterfaceStatus{

12./*insertcodehere*/intMY_VALUE=10;

13.}

Whichthreearevalidonline12?

（Choosethree.）

A.final

B.static

C.native

D.public

E.private

F.abstract

G.protected

Question2

Given:

10.publicclassBar{

11.staticvoidfoo（int...x）{

12.//insertcodehere

13.}

14.}

Whichtwocodefragments,insertedindependentlyatline12,willallow

theclasstocompile?

（Choosetwo.）

A.foreach（x）System.out.println（z）;

B.for（intz:

x）System.out.println（z）;

C.while（x.hasNext（））System.out.println（x.next（））;

D.for（inti=0;i

Question3

Given:

11.publicclassTest{

12.publicstaticvoidmain（String[]args）{

13.intx=5;

14.booleanb1=true;

15.booleanb2=false;

16.

17.if（（x==4）&&!

b2）

18.System.out.print（”l“）;

19.System.out.print（”2“）;

20.if（（b2=true）&&b1）

21.System.out.print（”3“）;

22.}

23.}

Whatistheresult?

A.2

B.3

C.12

D.23

E.123

F.Compilationfails.

G.Auexceptionalisthrownatruntime.

Question4

4.Given:

31.//somecodehere

32.try{

33.//somecodehere

34.}catch（SomeExceptionse）{

35.//somecodehere

36.}finally{

37.//somecodehere

38.}

Underwhichthreecircumstanceswillthecodeonline37beexecuted?

（Choosethree.）

A.Theinstancegetsgarbagecollected.

B.Thecodeonline33throwsanexception.

C.Thecodeonline35throwsanexception.

D.Thecodeonline31throwsanexception.

E.Thecodeonline33executessuccessfully.

Question5

Given:

10.interfaceFoo{}

11.classAlphaimplementsFoo{}

12.classBetaextendsAlpha{}

13.classDeltaextendsBeta{

14.publicstaticvoidmain（String[]args）{

15.Betax=newBeta（）;

16.//insertcodehere

17.}

18.}

Whichcode,insertedatline16,willcausea

java.lang.ClassCastException?

A.Alphaa=x;

B.Foof=（Delta）x;

C.Foof=（Alpha）x;

D.Betab=（Beta）（Alpha）x;

Question6

Given:

•disavalid,non-nullDateobject

•dfisavalid,non-nullDateFormatobjectsettothe

currentlocale

Whatoutputsthecurrentlocalescountrynameandtheappropriate

versionofd’sdate?

A.Localeloc=Locale.getLocale（）;

System.out.println（loc.getDisplayCountry（）

+““+df.format（d））;

B.Localeloc=Locale.getDefault（）;

System.out.println（loc.getDisplayCountry（）

+““+df.format（d））;

C.Localebc=Locale.getLocale（）;

System.out.println（loc.getDisplayCountry（）

+““+df.setDateFormat（d））;

D.Localeloc=Locale.getDefault（）;

System.out.println（loc.getDispbayCountry（）

+““+df.setDateFormat（d））;

Question7

Given:

20.publicclassCreditCard{

21.

22.privateStringcardlD;

23.privateIntegerlimit;

24.publicStringownerName;

25.

26.publicvoidsetCardlnformation（StringcardlD,

27.StringownerName,

28.Integerlimit）{

29.this.cardlD=cardlD;

30.this.ownerName=ownerName;

31.this.limit=limit;

32.}

33.}

Whichistrue?

A.Theclassisfullyencapsulated.

B.Thecodedemonstratespolymorphism.

C.TheownerNamevariablebreaksencapsulation.

D.ThecardlDandlimitvariablesbreakpolymorphism.

E.ThesetCardlnformationmethodbreaksencapsulation.

Question8

Assumethatcountryissetforeachclass.

Given:

10.publicclassMoney{

11.privateStringcountry,name;

12.publicgetCountry（）{returncountry;}

13.}

and:

24.classYenextendsMoney{

25.publicStringgetCountry（）{returnsuper.country;}

26.}

27.

28.classEuroextendsMoney{

29.publicStringgetCountry（StringtimeZone）{

30.returnsuper.getCountry（）;

31.}

32.}

Whichtwoarecorrect?

（Choosetwo.）

A.Yenreturnscorrectvalues.

B.Euroreturnscorrectvalues.

C.Anexceptionisthrownatruntime.

D.YenandEurobothreturncorrectvalues.

E.Compilationfailsbecauseofanerroratline25.

F.Compilationfailsbecauseofanerroratline30.

Question9

WhichManclassproperlyrepresentstherelationship“Manhasabest

friendwhoisaDog”?

A.classManextendsDog{}

B.classManimplementsDog{}

C.classMan{privateBestFrienddog;}

D.classMan{privateDogbestFriend;}

E.classMan{privateDog}

F.classMan{privateBestFriend}

Question10

Given:

11.publicclassPerson{

12.privatename;

13.publicPerson（Stringname）{

14.this.name=name;

15.}

16.publicinthashCode（）{

17.return420;

18.}

19.}

Whichistrue?

A.ThetimetofindthevaluefromHashMapwithaPersonkeydepends

onthesizeofthemap.

B.DeletingaPersonkeyfromaHashMapwilldeleteallmapentriesfor

allkeysoftypePerson.

C.InsertingasecondPersonobjectintoaHashSetwillcausethefirst

Personobjecttoberemovedasaduplicate.

D.ThetimetodeterminewhetheraPersonobjectiscontainedina

HashSetisconstantanddoesNOTdependonthesizeofthemap.

Question11

Given:

23.Object[]myObjects={

24.newinteger（12）,

25.newString（”foo”）,

26.newinteger（5）,

27.newBoolean（true）

28.};

29.Arrays.sort（myObjects）;

30.for（inti=0;i

31.System.out.print（myObjects[i].toString（））;

32.System.out.print（”“）;

33.}

Whatistheresult?

A.Compilationfailsduetoanerrorinline23.

B.Compilationfailsduetoanerrorinline29.

C.AClassCastExceptionoccursinline29.

D.AClassCastExceptionoccursinline31.

E.Thevalueofallfourobjectsprintsinnaturalorder.

Question12

12.Given:

13.publicclassPass{

14.publicstaticvoidmain（String[1args）{

15.intx5;

16.Passp=newPass（）;

17.p.doStuff（x）;

18.System.out.print（”mainx=“+x）;

19.}

20.

21.voiddoStuff（intx）{

22.System.out.print（”doStuffx=“+x++）;

23.}

24.}

Whatistheresult?

A.Compilationfails.

B.Anexceptionisthrownatruntime.

C.doStuffx=6mainx=6

D.doStuffx=5mainx=5

E.doStuffx=5mainx=6

F.doStuffx=6mainx=5

Question13

Given:

10.packagecom.sun.scjp;

11.publicclassGeodetics{

12.publicstaticfinaldoubleDIAMETER=12756.32;//kilometers

13.}

WhichtwocorrectlyaccesstheDIAMETERmemberoftheGeodetics

class?

（Choosetwo.）

A.importcom.sun.scjp.Geodetics;

publicclassTerraCarta{

publicdoublehalfway（）

{returnGeodetics.DIAMETER/2.0;}}

B.importstaticcom.sun.scjp.Geodetics;

publicclassTerraCarta{

publicdoublehalfway（）{returnDIAMETER/2.0;}}

C.importstaticcom.sun.scjp.Geodetics.*;

publicclassTerraCarta{

publicdoublehalfway（）{returnDIAMETER/2.0;}}

D.packagecom.sun.scjp;

publicclassTerraCarta{

publicdoublehalfway（）{returnDIAMETER/2.0;}}

Question14

Given:

10.classNav{

11.publicenumDirection{NORTH,SOUTH,EAST,WEST}

12.}

13.publicclassSprite{

14.//insertcodehere

15.}

Whichcode,insertedatline14,allowstheSpriteclasstocompile?

A.Directiond=NORTH;

B.Nav.Directiond=NORTH;

C.Directiond=Direction.NORTH;

D.Nav.Directiond=Nav.Direction.NORTH;

Question15

Given:

10.interfaceFoo{intbar（）;}

11.publicclassSprite{

12.publicintfubar（Foofoo）{returnfoo.bar（）;}

13.publicvoidtestFoo（）{

14.fubar（

15.//insertcodehere

16.）;

17.}

18.}

Whichcode,insertedatline15,allowstheclassSpritetocompile?

A.Foo{publicintbar（）{return1;}}

B.newFoo{publicintbar（）{return1;}}

C.newFoo（）{publicintbar（）{return1;}}

D.newclassFoo{publicintbar（）{return1;}}

Question16

ClicktheExhibitbutton.

10.interfaceFoo{

11.intbar（）;

12.}

13.

14.publicclassBeta{

15.

16.classAimplementsFoo{

17.publicintbar（）{return1;}

18.}

19.

20.publicintfubar（Foofoo）{returnfoo.bar（）;}

21.

22.publicvoidtestFoo（）{

23.

24.classAimplementsFoo{

25.publicintbar（）{return2;}

26.}

27.

28.System.out.println（fubar（newA（）））;

29.}

30.

31.publicstaticvoidmain（String[]argv）{

32.newBeta（）.testFoo（）;

33.}

34.}

Whichthreestatementsaretrue?

（Choosethree.）

A.Compilationfails.

B.Thecodecompilesandtheoutputis2.

C.Iflines16,17and18wereremoved,compilationwouldfail.

D.Iflines24,25and26wereremoved,compilationwouldfail.

E.Iflines16,17and18wereremoved,thecodewouldcompileand

theoutputwouldbe2.

F.Iflines24,25and26wereremoved,thecodewouldcompileand

theoutputwouldbe1.

Question17

Given:

1.packagesun.scjp;

2.publicenumColor{RED,GREEN,BLUE}

1.packagesun.beta;

2.//insertcodehere

3.publicclassBeta{

4.Colorg=GREEN;

5.publicstaticvoidmain（String[]argv）

6.{System.out.println（GREEN）;}

7.}

TheclassBetaandtheenumColorareindifferentpackages.

Whichtwocodefragments,insertedindividuallyatline2oftheBeta

declaration,willallowthiscodetocompile?

（Choosetwo.）

A.importsun.scjp.Color.*;

B.importstaticsun.scjp.Color.*;

C.importsun.scjp.Color;importstaticsun.scjp.Color.*;

D.importsun.scjp.*;importstaticsun.scjp.Color.*;

E.importsun.scjp.Color;importstaticsun.scjp.Color.GREEN;

Question18

Given:

1.publicinterfaceA{

2.StringDEFAULT_GREETING=“HelloWorld”;

3.publicvoidmethod1（）;

4.}

AprogrammerwantstocreateaninterfacecalledBthathasAasits

parent.Whichinterfacedeclarationiscorrect?

A.publicinterfaceBextendsA{}

B.publicinterfaceBimplementsA{}

C.publicinterfaceBinstanceOfA{}

D.publicinterfaceBinheritsFromA{}

Question19

Given:

1.classTestA{

2.publicvoidstart（）{System.out.println（”TestA”）;}

3.}

4.publicclassTestBextendsTestA{

5.publicvoidstart（）{System.out.println（”TestB”）;}

6.publicstaticvoidmain（String[]args）{

7.（（TestA）newTestB（））.start（）;

8.}

9.}

Whatistheresult?

A.TestA

B.TestB

C.Compilationfails.

D.Anexceptionisthrownat