面向对象编程基础习题及答案

本文格式为Word版，下载可任意编辑——面向对象编程基础习题及答案B.!=

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24.Ifyouattempttoaddanint,abyte,along,andadouble,theresultwillbea__________

value.

A.byteB.int;C.long;

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D.double;

25.Whatisthevalueof(double)5/2?

A.2;B.2.5;C.3;

D.2.0;

26.Whatisthevalueof(double)(5/2)?

A.2;B.2.5;

C.3;D.2.0;

27.Analyzethefollowingcode.

publicclassTest{

publicstaticvoidmain(String[]args){intmonth=09;

System.out.println(\}}

A.Theprogramdisplaysmonthis09B.Theprogramdisplaysmonthis9C.Theprogramdisplaysmonthis9.0

D.Theprogramhasasyntaxerror,because09isanincorrect

literalvalue.28.Toassignadoublevariabledtoafloatvariablex,youwrite

A.x=(long)d

B.x=(int)d;C.x=d;

D.x=(float)d;

29.whatisydisplayedinthefollowingcode?

publicclassTest1{

publicstaticvoidmain(String[]args){intx=1;

inty=x=x+1;

System.out.println(\}}

A.yis0.

B.yis1becausexisassignedtoyfirst.

C.yis2becausex+1isassignedtoxandthenxisassigned

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toy.

D.Theprogramhasasyntaxerrorsincexisredeclaredinthe

statementinty=x=x+1.30.Ifaprogramcompilesfine,butitterminatesabnormallyatruntime,thentheprogramsuffers

__________.

A.asyntaxerrorB.aruntimeerrorC.alogicerror

31.Supposex=0andy=0whatisxafterevaluatingtheexpression(y>0)&(1>x++).

A.0

B.-1C.1

32.Supposex=0andy=0whatisxafterevaluatingtheexpression(y>0)&&(1>x++).

A.0

B.-1C.1

33.SupposeyoudefineaJavaclassasfollows:

publicclassTest{}

Inordertocompilethisclass,theclassshouldbestoredinafilenamed

A.Test.classB.Test.docC.Test.txt

D.Test.java

E.Anynamewithextension.java34.ThecommandtocompileaclassinthefileTest.javais

A.javaTest

B.javaTest.java

C.javacTest.javaD.javacTestE.JAVACTest.java

35.WhichJDKcommandiscorrecttorunaJavaapplicationinByteCode.class?

A.javaByteCode

B.javaByteCode.classC.javacByteCode.javaD.javacByteCodeE.JAVACByt