达内软件

选择题

1:在软件生命周期中，下列哪个说法是不准确的？

厂A.软件生命周期分为计划、开发和运行三个阶段

厂B.在计划阶段要进行问题焉醛和需求分析

「C•在开发后期要进行编写代码和软件测试

D.在运行阶段主要是进行软件维护

2:

Whichisthemostappropriatecodesnippetthatcanbeinrtedatline18inthefollowingcode?

(Assumethatthecodeiscompiledandrunwithasrtionnabled)

.*;

2.

classAsrtTest

3.{

eHashMapcctld;

6.

AsrtTest()

8.

{

=newHashMap();

("in","India");

("uk","UnitedKingdom");

("au","Australia");

13.//morecode...

14.}

15.//othermethods....

StringgetCountry(StringcountryCode)

17.{

18.//Whatshouldbeinrtedhere?

country=(String)(countryCode);

country;

21.}

22.}

Whichisthemostappropriatecodesnippetthatcanbeinrtedatline18inthefollowingcode?

(Assumethatthecodeiscompiledandrunwithasrtionnabled)

.*;

2.

classAsrtTest

4.{

eHashMapcctld;

6.

AsrtTest()

6.{

=newHashMap();

("in","India");

("uk","UnitedKingdom");

("au","Australia");

11.//morecode...

12.}

13.//othermethods....

publicStringgetCountry(StringcountryCode)

{

//Whatshouldbeinrtedhere?

Stringcountry=(String)(countryCode);

returncountry;

}

countryCode!=null;

r

countryCode!=null:"CountrycodecannotbenuII";

r

cctld!=null:"Nocountrycodedataisavailable";

r

cctld:"Nocountrycodedataisavailable";

3:

Givethefollowingcode:

publicclassExample{

publicstaticvoidmain(Stringargs[]){

intl=0;

do{

n("ItCforrlgis:”+l);

}while(--l>0)

n(“Finish”);

}

}

Whichwellbeoutput:

Givethefollowingcode:

publicclassExample{

publicstaticvoidmain(Stringargs[]){

intl=0;

do{

n(“Doingitforlis:”+l);

}while(--l>0)

16.

17.

18.

19.

20.

21.

22.}

r

n(

}

}

Whichwellbeoutput:

r

tforlis3

厂tforlis1

厂tforlis2

r

tforlis04:

Givethisclassoutline:

classExample{

privateintx;

//restofclassbody…

}

AssumingthatxinvokedbythecodejavaExample,whichstatementcanmadexbedirectlyacces

sibleinmain()?

Givethisclassoutline:

classExample{

privateintx;

//restofclassbody…

}

AssumingthatxinvokedbythecodejavaExample,whichstatementcanmadexbedirectly

accessibleinmain()?

r

privateintxtopublicintx

r

privateintxtostaticintx

r

privateintxtoprotectedintx

r

privateintxtofinalintx5:Whichofthefollowingstatementsarenotlegal?

=4990;

=4L;

厂d=34.4;

t=0.9F.

“Finish”);

6:鉴于Java的特点，它最适合的计算环境是

A.并行计算环境

B.分布式计算环境

C.高强度计算环境

“D.开放式计算环境

7:Whatiswrittentothestandardoutputgiventhefollowingstatement:n(4|7);

Selecttherightanswer:

rL.4

B.5

8:

classX{

objectm(){

o=newfloat(3.14F);

[]oa=newobject[1];

[0]=o;

6.o=null;

[0]=null;

o;

9.}

10.}

Whenisthefloatobjectcreatedinline3,eligibleforgarbagecollection?

classX{

objectm(){

o=newfloat(3.14F);

[]oa=newobject[1];

[0]=o;

6.o=null;

[0]=null;

o;

9.}

10.}

Whenisthefloatobjectcreatedinline3,eligibleforgarbagecollection?

terline5

terline6

C.6

D.7

terline7

r

terline8(thatis,asthemethodreturns)

9:Considertheclasshierarchyshownbelow:classFourWheelerimplementsDrivingUtilitiesclass

CarextendsFourWheeler

classTruckextendsFourWheeler

classBuxtendsFourWheeler

classCraneextendsFourWheeler

Considerthefollowingcodebelow:

gUtilitiesdu;

eelerfw;

yTruck=newTruck();

=(DrivingUtilities)myTruck;

=newCrane();

=du;

Whichofthestatementsbelowaretrue?

Choices:

r

4willnotcompilebecauaninterfacecannotrefertoanobject.

ewillcompileandrun.

ewillnotcompilewithoutanexplicitcastatline6,becaugoingdownthe

hierarchywithoutcastingisnotallowed.

r

ewillcompileifweputanexplicitcastatline6butwillthrowanexception

runtime.

10:

Givethefollowingmethod:

publicvoidmethod(){

Stringa,b;

a=newString(“heihorld”);

b=newString(“gaomer”);

n(a+b+”ok”);

a=null;

a=b;

n(a);

}

Intheabnceofcompileroptimization,whichistheearliestpointtheobjectareferedisdefinitely

elibiletobegarbagecollection.

Givethefollowingmethod:

publicvoidmethod(){

Stringa,b;

a=newString(“helloworld”);

b=newString(“gameover”);

n(a+b+”ok”);

a=null;

a=b;

n(a);

}

Intheabnceofcompileroptimization,whichistheearliestpointtheobjectarefereddefinitely

elibiletobegarbagecollection.

r

line5

r

line6

r

line7

r

line9

11:

Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?

publicclassStatic

static

{

at

is

{

intx=5;

}

staticintx,y;

publicstaticvoidmain(Stringargs[])

{

x--;

myMethod();

n(x+y+++x);

}

publicstaticvoidmyMethod()

{

y=x+++++x;

}

}

Choices:

Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?publicclassStatic

{

static

intx=5;

}

staticintx,y;

publicstaticvoidmain(Stringargs[])

{

x--;

myMethod();

n(x+y+++x);

}

publicstaticvoidmyMethod()

{

y=x+++++x;

}

}

Choices:

r

:2

r

:3

r

:7

r

:8

12:

Whatwillbetheresultofexecutingthefollowingcode?

publicstaticvoidmain(Stringargs[])

{

chardigit='a';

for(inti=0;i<10;i++)

{

switch(digit)

{

ca'x':

{

intj=0;

n(j);

}

default:

{

intj=100;

n(j);

}

}

}

inti=j;

n(i);

}

Choices:

Whatwillbetheresultofexecutingthefollowingcode?

publicstaticvoidmain(Stringargs[])

{

chardigit='a';

for(inti=0;i<10;i++)

{switch(digit)

{

ca'x':

{

intj=0;

n(j);

}default:

{

intj=100;

n(j);

}

}

}

inti=j;

n(i);

Choices:

r

A.100willbeprinted11times.

r

ewillnotcompilebecauthevariableicannotbedeclaredtwicewithinthe

main()method.

广

ewillnotcompilebecauthevariablejcannotbedeclaredtwicewithinthe

switchstatement.

r

the.

13:软件生命周期的瀑布模型把软件项目分为3个阶段、8个子阶段，以下哪一个是正常的开

发顺序？

「A.计划阶段、开发阶段、运行阶段

厂B.设计阶段、开发阶段、编码阶段

厂C.设计阶段、编码阶段、维护阶段

“D.计划阶段、编码阶段、测试阶段

14:设有变量说明语句inta=1,b=0;

则执行以下程序段的输出结果为()。

switch(a)

{

ca1:

switch(b)

{

ca0:printf("**O**");break;

ca1:printf("**1**");break;

}

ca2:printf("**2**");break;

}

printf("n");

r

**0**

o

B**0****2**

r

**0****1****2**

D.有语法错误

15:

Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?classBa

{

inti=99;

publicvoidamethod()

{

n("d()");

}

Ba()

{

amethod();

}

}

publicclassDerivedextendsBa

{

inti=-1;

publicstaticvoidmain(Stringargv[])

{

Bab=newDerived();

n(b.i);

d();

{

publicvoidamethod()

{

n("d()");

}

}

Choices:

Whatwillhappenwhenyouattempttocompileandrunthefollowingcode?classBa

{

inti=99;

publicvoidamethod()

{

n("d()");

}

Ba()

{

amethod();

}

}

publicclassDerivedextendsBa

inti=-1;

publicstaticvoidmain(Stringargv[])

36

{

Bab=newDerived。；

n(b.i);

d();

}

publicvoidamethod()

{

n("d()");

}

Choices:

r

d()-d()

r

d()99

r

etimeerror

r

d()

简答题

16:写一个方法，删除JAVA源文件中的注释，

17:是否可以继承String类？

18:写一个程序做低于256位整数的运算，并有如下输出

比如输入：12,23输出：

12

*23

24276

19:abstractclassName{

privateStringname;

publicabstractbooleanisStupidName(Stringname){}

}

这有何错误?

20:hibernate有那些抓取策略？

21:请问你在什么情况下会在你的JAVA代码中使用可序列化？为什么放到HttpSession中的对象必

须要是可序列化的？

22:说明Jsp中errorPage的作用，应用范围。

23:Overload和Override的区别。Overloaded的方法是否可以改变返回值的类型?

24:两个对象值相同((y)==true)，但却可有不同的hashcode,这句话对不对？

25:耶稣有13个门徒，其中有一个就是出卖耶稣的叛徒，请用排除法找出这位叛徒：13人围

坐一圈，从第一个开始报号：1,2,3,1,2,3……，凡是报到“3就退出圈子，最后留在

圈内的人就是出卖耶稣的叛徒，请找出它原来的序号。