单项选择题 11.classa{12.publicvoidprocess（）{System.out.print（”a，”）；}}13.classbextendsa{14.publicvoidprocess（）throwsIOException{15.super.process（）；16.System.out.print（”b，”）；17.thrownewIOException（）；18.}}19.publicstaticvoidmain（String[]args）{20.try{newb（）.process（）；}21.catch（IOExceptione）{System.out.println（”Exception”）；}}Whatistheresult？（）A.ExceptionB.a，b，ExceptionC.Compilationfailsbecauseofanerrorinline20.D.Compilationfailsbecauseofanerrorinline14.E.ANullPointerExceptionisthrownatruntime.

单项选择题 publicclassAssertStuff{publicstaticvoidmain（String[]args）{intx=5；inty=7；assert（x>y）：stuff”；System.out.println（”passed”）；}}Andthesecommandlineinvocations：javaAssertStuffjava-eaAssertStuffWhatistheresult？（）A.passedstuffB.stuffpassedC.passed AnAssertionErroristhrownwiththeword“stuff”addedtothestacktrace.D.passed AnAssertionErroristhrownwithouttheword“stuff”addedtothestacktrace.E.passed AnAssertionExceptionisthrownwiththeword“stuff”addedtothestacktrace.F.passed AnAssertionExceptionisthrownwithouttheword“stuff”addedtothestacktrace.

单项选择题 23.intz=5；24.25.publicvoidstuff1（intx）{26.assert（x>0）；27.switch（x）{28.case2：x=3；29.default：assertfalse；}}30.31.privatevoidstuff2（inty）{assert（y<0）；}32.33.privatevoidstuff3（）{assert（stuff4O）；}34.35.privatebooleanstuff4（）{z=6；returnfalse；}Whichistrue？（）A.Alloftheassertstatementsareusedappropriately.B.Onlytheassertstatementonline31isusedappropriately.C.Theassertstatementsonlines29and31areusedappropriately.D.Theassertstatementsonlines26and29areusedappropriately.E.Theassertstatementsonlines29and33areusedappropriately.F.Theassertstatementsonlines29，31，and33areusedappropriately.G.Theassertstatementsonlines26，29，and31areusedappropriately.

单项选择题 11.publicstaticvoidmain（String[]args）{12.Integeri=uewInteger（1）+newInteger（2）；13.switch（i）{14.case3：System.out.println（”three”）；break；15.default：System.out.println（”other”）；break；16.}17.}Whatistheresult？（）A.threeB.otherC.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerroronline12.E.Compilationfailsbecauseofanerroronline13.F.Compilationfailsbecauseofanerroronline15.

单项选择题 10.classLine{11.publicclassPoint{publicintx，y；}12.publicPointgetPoint（）{returnnewPoint（）；}13.}14.classTriangle{15.publicTriangle（）{16.//insertcodehere17.}18.}Whichcode，insertedatline16，correctlyretrievesalocalinstanceofaPointobject？（）A.Pointp=Line.getPoint（）；B.Line.Pointp=Line.getPoint（）；C.Pointp=（newLine（））.getPoint（）；D.Line.Pointp=（newLine（））.getPoint（）；

单项选择题 publicclassTest{publicenumDogs{collie，harrier}；publicstaticvoidmain（String[]args）{DogsmyDog=Dogs.collie；switch（myDog）{casecollie：System.out.print（”collie）；caseharrier：System.out.print（”harrier）；}}}Whatistheresult？（）A.collieB.harrierC.Compilationfails.D.collieharrierE.Anexceptionisthrownatruntime.

单项选择题 publicclassPlant{privateStringname；publicPlant（Stringname）{this.name=name；}publicStringgetName（）{returnname；}}publicclassTreeextendsPlant{publicvoidgrowFruit（）{}publicvoiddropLeaves（）{}}Whichistrue？（）

单项选择题 publicclassTest{publicenumDogs{collie，harrier，shepherd}；publicstaticvoidmain（String[]args）{DogsmyDog=Dogs.shepherd；switch（myDog）{casecollie：System.out.print（”collie）；casedefault：System.out.print（”retriever）；caseharrier：System.out.print（”harrier）；}}}Whatistheresult？（）A.harrierB.shepherdC.retrieverD.Compilationfails.E.retrieverharrierF.Anexceptionisthrownatruntime.

单项选择题 publicclassBootchy{intbootch；Stringsnootch；publicBootchy（）{this（”snootchy”）；System.out.print（”first）；}publicBootchy（Stringsnootch）{this（420，snootchy”）；System.out.print（”second）；}publicBootchy（intbootch，Stringsnootch）{this.bootch=bootch；this.snootch=snootch；System.out.print（”third）；}publicstaticvoidmain（String[]args）{Bootchyb=newBootchy（）；System.out.print（b.snootch++b.bootch）；}}Whatistheresult？（）A.snootchy420thirdsecondfirstB.snootchy420firstsecondthirdC.firstsecondthirdsnootchy420D.thirdsecondfirstsiiootchy420E.thirdfirstsecondsnootchy420F.firstsecondfirstthirdsnootchy420

单项选择题 Whencomparingjava.io.BufferedWritertojava.io.FileWriter，whichcapabilityexistsasamethodinonlyoneofthetwo？（）

单项选择题 importjava.io.*；publicclassForestimplementsSerializable{privateTreetree=newTree（）；publicstaticvoidmain（String[]args）{Forestf=newForest（）；try{FileOutputStreamfs=newFileOutputStream（”Forest.ser”）；ObjectOutputStreamos=newObjectOutputStream（fs）；os.writeObject（f）；os.close（）；}catch（Exceptionex）{ex.printStackTrace（）；}}}classTree{}Whatistheresult？（）A.Compilationfails.B.Anexceptionisthrownatruntime.C.AninstanceofForestisserialized.D.AinstanceofForestandaninstanceofTreearebothserialized.

单项选择题 借记卡属于()。

单项选择题 publicclassYikes{publicstaticvoidgo（Longn）{System.out.println（”Long）；}publicstaticvoidgo（Shortn）{System.out.println（”Short）；}publicstaticvoidgo（intn）{System.out.println（”int）；}publicstaticvoidmain（String[]args）{shorty=6；longz=7；go（y）；go（z）；}}Whatistheresult？（）A.intLongB.ShortLongC.Compilationfails.D.Anexceptionisthrownatruntime.

单项选择题 publicclassWow{publicstaticvoidgo（shortn）{System.out.println（”short”）；}publicstaticvoidgo（Shortn）{System.out.println（”SHORT”）；}publicstaticvoidgo（Longn）{System.out.println（”LONG”）；}publicstaticvoidmain（String[]args）{Shorty=6；intz=7；go（y）；go（z）；}}Whatistheresult？（）A.shortLONGB.SHORTLONGC.Compilationfails.D.Anexceptionisthrownatruntime.

单项选择题 Datedate=newDate（）；13.df.setLocale（Locale.ITALY）；14.Strings=df.format（date）；ThevariabledfisanobjectoftypeDateFormatthathasbeeninitializedinline11.WhatistheresultifthiscodeisrunonDecember14，2000？（）

单项选择题 1.importjava.io.*；2.publicclassFooimplementsSerializable{3.publicintx，y；4.publicFoo（intx，inty）{this.x=x；this.y=y；}5.6.privatevoidwriteObject（ObjectOutputStreams）7.throwsIOException{8.s.writeInt（x）；s.writeInt（y）9.}10.11.privatevoidreadObject（ObjectInputStreams）12.throwsIOException，ClassNotFoundException{13.14.//insertcodehere15.16.}17.}Whichcode，insertedatline14，willallowthisclasstocorrectlyserializeand deserialize？（）

单项选择题 AssumingthattheserializeBanana2（）andthedeserializeBanana2（）methodswillcorrectlyuseJavaserializationandgiven：importjava.io.*；classFood{Food（）{System.out.print（”1”）；}}classFruitextendsFoodimplementsSerializable{Fruit（）{System.out.print（”2”）；}}publicclassBanana2extendsFruit{intsize=42；publicstaticvoidmain（String[]args）{Banana2b=newBanana2（）；b.serializeBanana2（b）；//assumecorrectserializationb=b.deserializeBanana2（b）；//assumecorrectSystem.out.println（”restored+b.size+）；}//moreBanana2methods}Whatistheresult？（）

单项选择题 10.publicclassFooimplementsjava.io.Serializable{11.privateintx；12.publicintgetX（）{returnx；}12.publicFoo（intx）{this.x=x；}13.privatevoidwriteObject（ObjectOutputStreams）14.throwsIOException{15.//insertcodehere16.}17.}Whichcodefragment，insertedatline15，willallowFooobjectstobecorrectlyserializedanddeserialized？（）A.s.writeInt（x）；B.s.serialize（x）；C.s.writeObject（x）；D.s.defaultWriteObject（）；

判断题 通信管道与通道的建设应较相关市政地下管线之前进行建设。()

单项选择题 publicvoidsomeMethod（Objectvalue）{12.／／checkfornullvalue....20.System.out.println（value.getClass（））；21.}What，insertedatline12，istheappropriatewaytohandleanullvalue？（）