浙大网新中研软件开发工程师笔试题.docx
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浙大网新中研软件开发工程师笔试题
浙大网新中研软件开发工程师笔试题
选择题
1:
Considertheclasshierarchyshownbelow:
classFourWheelerimplementsDrivingUtilities
classCarextendsFourWheeler
classTruckextendsFourWheeler
classBusextendsFourWheeler
classCraneextendsFourWheeler
-
Considerthefollowingcodebelow:
1.DrivingUtilitiesdu;
2.FourWheelerfw;
3.TruckmyTruck=newTruck（）;
4.du=（DrivingUtilities）myTruck;
5.fw=newCrane（）;
6.fw=du;
Whichofthestatementsbelowaretrue?
Choices:
A.Line4willnotcompilebecauseaninterfacecannotrefertoanobject.
B.Thecodewillcompileandrun.
C.Thecodewillnotcompilewithoutanexplicitcastatline6,becausegoingdownthehierarchywithoutcastingisnotallowed.
D.Thecodewillcompileifweputanexplicitcastatline6butwillthrowanexceptionatruntime.
2:
Aclassdesignrequiresthatamembervariableshouldbeaccessibleonlybysamepackage,whichmodiferwordshouldbeused?
A.protected
B.public
C.nomodifer
D.private
3:
Whatistheresultwhenyoucompileandrunthefollowingcode?
publicclassThrowsDemo
{
staticvoidthrowMethod（）
{
System.out.println（InsidethrowMethod.）;
thrownewIllegalAccessException（demo）;
}
publicstaticvoidmain（Stringargs[]）
{
try
{
throwMethod（）;
}
catch（IllegalAccessExceptione）
{
System.out.println（Caught+e）;
}
}
}
Choices:
Whatistheresultwhenyoucompileandrunthefollowingcode?
publicclassThrowsDemo
{
staticvoidthrowMethod（）
{
System.out.println（InsidethrowMethod.）;
thrownewIllegalAccessException（demo）;
}
publicstaticvoidmain（Stringargs[]）
{
try
{
throwMethod（）;
}
catch（IllegalAccessExceptione）
{
System.out.println（Caught+e）;
}
}
}
Choices:
A.Compilationerror
B.Runtimeerror
C.Compilesuccessfully,nothingisprinted.
D.InsidethrowMethod.followedbycaught:
java.lang.IllegalAccessExcption:
demo
4:
Inthefollowingcode,whichistheearlieststatement,wheretheobjectoriginallyheldine,maybegarbagecollected:
1.publicclassTest{
2.publicstaticvoidmain（Stringargs[]）{
3.Employeee=newEmployee（Bob,48）;
4.e.calculatePay（）;
5.System.out.println（e.printDetails（））;
6.e=null;
7.e=newEmployee（Denise,36）;
8.e.calculatePay（）;
9.System.out.println（e.printDetails（））;
10.}
11.}
OnlyOne:
Inthefollowingcode,whichistheearlieststatement,wheretheobjectoriginallyheldine,maybegarbagecollected:
1.publicclassTest{
2.publicstaticvoidmain（Stringargs[]）{
3.Employeee=newEmployee（Bob,48）;
4.e.calculatePay（）;
5.System.out.println（e.printDetails（））;
6.e=null;
7.e=newEmployee（Denise,36）;
8.e.calculatePay（）;
9.System.out.println（e.printDetails（））;
10.}
11.}
OnlyOne:
A.Line10
B.Line11
C.Line7
D.Line8
5:
Whatwillbetheresultofexecutingthefollowingcode?
publicstaticvoidmain（Stringargs[]）
{
chardigit=a
for（inti=0;ii++）
{
switch（digit）
{
casex:
{
intj=0;
System.out.println（j）;
}
default:
{
intj=100;
System.out.println（j）;
}
}
}
inti=j;
System.out.println（i）;
}
Choices:
Whatwillbetheresultofexecutingthefollowingcode?
publicstaticvoidmain（Stringargs[]）
{
chardigit=a
for（inti=0;ii++）
{
switch（digit）
{
casex:
{
intj=0;
System.out.println（j）;
}
default:
{
intj=100;
System.out.println（j）;
}
}
}
inti=j;
System.out.println（i）;
}
Choices:
A.100willbeprinted11times.
B.Thecodewillnotcompilebecausethevariableicannotbedeclaredtwicewithinthemain（）method.
C.Thecodewillnotcompilebecausethevariablejcannotbedeclaredtwicewithintheswitchstatement.
D.Noneofthese.
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