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.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){System.out.println("first");}
elseif(x>-3){System.out.println("second");}
else{System.out.println("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}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){
System.out.println("condition2");
}catch(Exceptione){
System.out.println("condition3");
}finally{
System.out.println("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!
=null)&(str.length()<5)){
6}System.out.println("lessthan5");
7}}
8)else{System.out.println("end");}
Whichlinewillcauseerror
A.line1
B.line2
C.line5
D.line8
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.Itiscorrectwhencompilationbutwillcauseerrorwhenrunning.
C.Theoutputiszero.
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