东北大学面向对象程序设计考试试

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1、总分一二三四五……………○……………密……………○……………封……………○…………线………………………………学　院班　级学　号姓　名东北大学考试试卷（A卷）　　　　　　　　　　　　2012　—2013　　　学年第　一　学期　　　　　　　　　　　课程名称：面向对象程序设计8Ifafileopenedforreadingdoesnotexist,whichofthefollowingeventswilloccurinJava?()(A)ANullPointerExceptionwillberaised.(B)Anewfilewillbecreated(C)Arun-timeerrorwillo

2、ccur(D)AFileNotFoundExceptionwillberaised.9Adesignpatternistypicallyusedto()(A)allowtheuseofobject-orientatedconceptsinalanguagethatisnotobject-oriented(B)reducethenumberofclassesinthedesignofaprogram(C)ensurethatcodeexecutesatoptimalspeedduringruntime(D)describeapracticalsolutiontoacommondesignpr

3、oblem10Whichofthefollowingstatementsis(are)trueinJava?()IClassesthatcontainabstractmethodsmustbedeclaredabstract.IIClassesthatcontainprotectedmethodsmustbedeclaredabstract.(A)IandII(B)Ionly(C)IIonly(D)NoneI.SingleChoice（20points,2pointseach）　　　　　　　　┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

4、┄┄┄┄┄┄┄┄┄┄┄┄　　1Fromwithinachildclass,itsparentclassisreferredtoviathekeyword?()(A)this(B)Base(C)Super(D)parent2ClassesfromwhichofthefollowingpackagesareimplicitlyimportedintoeveryJavaprogram?()(A)java.lang(B)java.util(C)java.awt(D)java.io3InJava,thedefaultlayoutmanagerforaJPanelcomponentis()(A)Bor

5、derLayout(B)GridLayout(C)GridBagLayout(D)FlowLayout4TheStrategydesignpatternislikelytobeusefulwhenimplementingwhichofthefollowing?()IAnapplicationthatoffersseveralalternatesortingalgorithmsIIAsimpleclasstostoretheaddressofanorganizationofwhichonlyoneinstancecanbeinstantiated(A)None(B)Ionly(C)IIonl

6、y(D)IandII5IfthelengthofaparticulararrayisthevalueofLIMIT,whatistheindexofthelastiteminthatarray?()(A)LIMIT(B)0(C)LIMIT/2(D)LIMIT-16Whichofthefollowingstatementsisnottrueoftheclassjava.util.ArrayList?()(A)AninstanceofArrayListcangrowtoaccommodatenewitemswhenthecollectionisfull.(B)Onceanobjectisins

7、ertedintoaninstanceofArrayList,itcanneverberemoved.(C)ItemsstoredbyaninstanceofArrayListcanbeaccessedusingintegerindexes.(D)TheconstructoroftheArrayListclass,whencalledwithnoarguments,causesanemptyArrayListtobeco