Java工程师全英文面试题.docx

Java工程师全英文面试题.docx

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Java工程师全英文面试题

Java软件工程师面试题

Circleoneormoreoptionswhicharecorrect.

1.WhywouldsomeonewanttouseJavaScriptonaWebpage?

（5scores）

A.ToreacttoeventsthatoccurwithWebpageuse

B.ToreadandwriteHTML

C.TovalidatedatainaWebform

D.TopassdatatoaJavaappletprogram

E.TorunaclockortimerinaWebpage

2.EvaluatethefollowingStringmethodusesbywritingthevalueofsaftertheevaluation（5scores）（writeonevalueonthelinetotherightofeachevaluation）

varstr="MixandMatch"

A.s=str.indexOf（"x"）__2

B.s=str.indexOf（"g"）___-1

C.s=str.indexOf（"M"）___0

D.s=str.lastIndexOf（"a"）___9

E.s=str.indexOf（"and"）___4

3.HowcansomeoneproperlyopenasecondWebbrowserwindowwithaJavaScriptstatement?

（5scores）

A.document.openWin（""）

B.openWindow（""）

C.window.open（“”）

D.document.open（""）

E.document.location（""）

4.GiventhefollowingvalidHTMLform,howwouldyouassignthevaluetypedintotheowner

controltoavariablessninaJavaScriptstatement?

（5scores）

A.ssn=window.SSN.owner.value;

B.ssn=document.SSN.owner.value;

C.ssn=document.SSN.input.value;

D.ssn=document.form.input.value;

E.ssn=window.owner.value;

5.AfteraJavaScriptfunctionrunsthefollowingtwolinesofcode,whatvaluedoesthevariablexcontain?

（5scores）

arr=newArray（5）;

x=Math.random（）/arr.length;

A.afloatingpointnumberbetween0.0and0.2

B.afloatingpointnumberbetween0.0and0.25

C.afloatingpointnumberbetween0.0and1.0

D.afloatingpointnumberbetween0.0and5.0

E.xwouldnotbeassignedduetooneormoreerrorsinthecode

6.WhatisthevalueofvariablexafterthefollowingblockofJavaScriptcodeisrun?

（5scores）

x=0;

y=2;

while（y>0.5||y<0.0）{

x=x+1;

y=y/x-y;

}

A.0

B.1

C.morethan1

D.undeterminedsincethecodedividesbyzero

E.lessthan1

7.Whatwillhappenwhenyouattempttocompileandrunthiscode?

（5scores）

abstractclassBase{

abstractpublicvoidmyfunc（）;

publicvoidanother（）{

System.out.println（"Anothermethod"）;

}

}

publicclassAbsextendsBase{

publicstaticvoidmain（Stringargv[]）{

Absa=newAbs（）;

a.amethod（）;

}

publicvoidmyfunc（）{

System.out.println（"MyFunc"）;

}

publicvoidamethod（）{

myfunc（）;

}

}

AThecodewillcompileandrun,printingoutthewords"MyFunc"

BThecompilerwillcomplainthattheBaseclasshasnonabstractmethods

CThecodewillcompilebutcomplainatruntimethattheBaseclasshasnonabstractmethods

DThecompilerwillcomplainthatthemethodmyfuncinthebaseclasshasnobody,nobodyatalltoloooveit

8.WhichmostcloselymatchesadescriptionofaJavaMap?

（5scores）

A.Avectorofarraysfora2Dgeographicrepresentation

B.Aclassforcontaininguniquearrayelements

C.Aclassforcontaininguniquevectorelements

D.Aninterfacethatensuresthatimplementingclassescannotcontainduplicatekeys

9.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?

（5scores）

publicclassStrEq{

publicstaticvoidmain（Stringargv[]）{

StrEqs=newStrEq（）;

}

privateStrEq（）{

Strings="Marcus";

Strings2=newString（"Marcus"）;

if（s==s2）{

System.out.println（"wehaveamatch"）;

}else{

System.out.println（"Notequal"）;

}

}

}

A.Compiletimeerrorcausedbyprivateconstructor

B.Outputof"wehaveamatch"

C.Outputof"Notequal"

D.Compiletimeerrorbyattemptingtocomparestringsusing==

10.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?

（5scores）

importjava.io.*;

classBase{

publicvoidamethod（）throwsFileNotFoundException{}

}

publicclassExcepDemoextendsBase{

publicstaticvoidmain（Stringargv[]）{

ExcepDemoe=newExcepDemo（）;

}

publicvoidamethod（）{}

protectedExcepDemo（）{

try{

DataInputStreamdin=newDataInputStream（System.in）;

System.out.println（"Pausing"）;

din.readByte（）;

System.out.println（"Continuing"）;

this.amethod（）;

}catch（IOExceptionioe）{

}

}

}

A.Compiletimeerrorcausedbyprotectedconstructor

B.CompiletimeerrorcausedbyamethodnotdeclaringException

C.RuntimeerrorcausedbyamethodnotdeclaringException

D.Compileandrunwithoutputof"Pausing"and"Continuing"afterakeyishit

11.Whatwillhappenwhenyouattempttocompileandrunthisprogram?

（5scores）publicclassOuter{

publicStringname="Outer";

publicstaticvoidmain（Stringargv[]）{

Inneri=newInner（）;

i.showName（）;

}//Endofmain

privateclassInner{

Stringname=newString（"Inner"）;

voidshowName（）{

System.out.println（name）;

}

}//EndofInnerclass

}

A.Compileandrunwithoutputof"Outer"

B.Compileandrunwithoutputof"Inner"

C.CompiletimeerrorbecauseInnerisdeclaredasprivate

D.CompiletimeerrorbecauseofthelinecreatingtheinstanceofInner

12.Whatwillbeoutputbythefollowingline?

（5scores）

System.out.println（Math.floor（-2.1））;

A.-2

B.2.0

C.-3

D.-3.0

13.Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?

（5scores）

intOutput=10;

booleanb1=false;

if（（b1==true）&&（（Output+=10）==20））{

System.out.println（"Weareequal"+Output）;

}else{

System.out.println（"Notequal!

"+Output）;

}

A.Compileerror,attemptingtopeformbinarycomparisononlogicaldatatype

B.Compilationandoutputof"Weareequal10"

C.Compilationandoutputof"Notequal!

20"

D.Compilationandoutputof"Notequal!

10"

14.Giventhefollowingvariables

charc='c';

inti=10;

doubled=10;

longl=1;

Strings="Hello";

Whichofthefollowingwillcompilewithouterror?

（5scores）

A.c=c+i;

B.s+=i;

C.i+=s;

D.c+=s;

15.Giventhefollowingclassdefinition,whichofthefollowingstatementswouldbelegalafterthecomment//Here?

（5scores）

classInOut{

Strings=newString（"Between"）;

publicvoidamethod（finalintiArgs）{

intiam;

classBicycle{

publicvoidsayHello（）{

//Here

}

}//Endofbicycleclass

}//Endofamethod

publicvoidanother（）{