达内第一次月考试题-15年.docVIP

在线考试本次考试得分：96.0

1.

(单项选择题)以下代码的运行结果是：

01

public?class?GoTest{

02

?public?static?void?main(String[]args){

03

??Sentea=?new?Sente();

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??a.go();

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??Gobanb=?new?Goban();

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??b.go();

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??Stonec=?new?Stone();

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??c.go();

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?}

10

}

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class?Sente?implements?Go{

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?public?void?go(){

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??System.out.println(goinSente);

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?}

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}

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class?Goban?extends?Sente{

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?public?void?go(){

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??System.out.println(goinGoban);

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?}

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}

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class?Stone?extends?Goban?implements?Go{

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}

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interface?Go{

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?public?void?go();

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}

?A.

goinGobangoinSentegoinSente

?B.

goinSentegoinSentegoinGoban

?C.

goinSentegoinGobangoinGoban

?D.

goinGobangoinGobangoinSente

正确答案：C解析：

2.

(单项选择题)请看以下代码：

01

class?Payload{

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?private?int?weight;

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?public?Payload(int?wt){

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??weight=wt;

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?}

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?public?Payload(){}

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??public?void?setWeight(int?w){

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????weight=w;

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??}

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??public?StringtoString(){

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???return?Integer.toString(weight);

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??}

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}

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public?class?TestPayload{

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?static?void?changePayload(Payloadp){

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?插入代码

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?}

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?public?static?void?main(String[]args){

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???Payloadp=?new?Payload();

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???p.setWeight(1024);

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???changePayload(p);

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???System.out.println(Thevalueofpis?+p);

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?}

24

}

假设运行后输出“Thevalueofpis420”，那么插入代码处应填入代码是：

?A.

p.setWeight(420);

?B.

Payload.setWeight(420);

?C.

p=newPayload(420);

?D.

p=newPayload();p.setWeight(420);

正确答案：A解析：

3.

(单项选择题)关于以下代码说法不正确的选项是：

01

10.?interface?Foo{

02

11.?int?bar();

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12.}

04

13.

05

14.?public?class?Beta{

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15.

07

16.?class?A?implements?Foo{

08

17.?public?int?bar(){?return?1;}

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18.}

10

19.

11

20.?public?int?fubar(Foofoo){?return?foo.bar();}

12

21.

13

22.?public?void?testFoo(){

14

23.

15

24.?class?A?implements?Foo{

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25.?public?int?bar(){?return?2;}

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26.}

18

27.

19

28.System.out.println(fubar(?new?A()));

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29.}

21

30.

22

31.?public?static?void?main(String[]argv){

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32.?new?Beta().testFoo();

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33.}

25

34.}

?A.

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