sun java程序员认证考试题库有精力的同学看看

第十三章Java驱动编第一章练习题（JavaC1．下列哪项不是JDK所包含的内容？（选一项JavaJavaEEJavad2．下列关于JDK、JRE和JVMA．JDK中包含了JRE，JVM中包含了JREB．JRE中包含了JDK，JDK中包含了JVMC．JRE中包含了JDK，JVM中包含了JRED．JDK中包含了JRE，JRE中包含了a3javaa4．JDKjavadocA．生成JavaB．编译JavaC．执行JavaD．测试JavaAcd5．以下哪些包是Java标准库中常用的包？（选三项B．javax．servlet.httpC．java.iod6．使用JDK工具生成的JavaA．XML格式D．HTMLac7．以下关于JVM的叙述，哪项正确？（选两项）A．JVM运行于操作系统之上，它依赖于操作系统B．JVM运行于操作系统之上，它与操作系统无关C．JVM支持Java程序运行，它能够直接运行JavaD．JVM支持Java程序运行，它能够直接运行Javac8．以下关于支持JavaJava可在SolarisJava可在WindowsJava语言与平台无关。JavaJava语言与平台无关。JavaB?9．以下关于Applet和Java-个Applet就是一段JavaApplet是一种特殊的Java程序，它需要运行在WebApplet是一种特殊的Java程序，它需要运行在WebApplet是一种JavaSEAd?10．以下关于JavaHotSpot的描述，哪两项错误？（选两项JavaHotSpot是一种热编译技术，在编译JavaJavaHotSpot是一种热编译技术，在运行JavaJavaHotSpotJavaHotSpot B?13．JVM在执行一个Javaa14．当运行—个Javajava1javac1java1java1+ab15．以下关于Java文件名的叙述，正确的有？（选两项Java源文件的扩展名应为JavaJava一个Java源文件中只能包含一个JavaAABDCA下列哪项不属于Javaint下列哪项是Java语言中所规定的注释样式？（选三项C．D．下列哪项不是Java现有如下五个Linel:inta_really_really_really_long_variable_name=5;Line2:int Line4：int$dollars=8;line5:intopercent=9;C.D.class staticint }classMiddleextendsToppublic staticvoidmain Middlem=newSystem.out.println(x); B.classPasserstaticfinalint staticvoidmain Passer()．goSystem.out.print(x); voidgo(int System.out 10.classWrenchpublicstaticvoid Wrenchw=new Wrenchw2=neww2=go(w,w2)；5.System.out.print(w2==w); staticWrenchgo(Wrench Wrench Wrenchwr3=wrl;wrl=wr2;return}} intpublicstaticvoid Wrench2w=new Wrench2w2=go(w, System.out.print(w2.)staticWrench2go(W 15 return classTest2 staticvoidmain(String shorta，b,C；}}short表达式：1-2/5+2k59 Stringsl=S+456;请问sl基本数据类型float publicstaticvoidmain booleanbooleanshortZ=42; System. Z=z=1012131415class voidmain(String[] for(int i=0;i<lO;i++){System.out.print}}}D． voidmain(String[] intx=6；ifSystem.out.println("x>l");elseif(x>5)System.out.println("x>5");elseif(x<10)System.out.println("x<lO");elseif(x<29)System.out.println("x<29");.out．rintln）;}}C．x<10class voidmain(String[] int[5] myarray={10,11,12,13,14);intfor(intx ：myarray)System.out.println("sum=}}下列有关数组的中，正确的是哪项？（选两项int int[5]int已知数组arrayarray.size- staticvoidmain(String[] intX=5：switch(x){casel：case2：case3：trn）;case4：casecaseout．rintln；out．rintln）;)})A.一季度33

为将数组myArray36，现采取以下编码：int[]myArray=newint[3]; 数组myArray363数组myArray363数组myArraymyArray363 staticvoidmain booleanintif((++i>2) 7．if((++i>4) ll System.out.println}}65publicclassTesterpublicstaticvoidmain(String[] Integer Integerintx3=new }class publicstaticV.id }}class publicstaticvoidmain inti=5：4．System.out.print("4"+i+"");5．System.out.print(i+5+"7"); 8．994545 Stringnames names names String[3]names={"zhang","wang",class staticvoidmain intwhile(++x<4) 7．System.out.println( 9．class publicstaticvoidmain booleanX=booleanshortZ=20; if((y==true)|| System.out.println(}}Z=class publicstaticvoidmain intintfor z<3； }System.out.println}}ID12131415别下列类Account的构造方法中，正确的是Account(StringAccount AccountNewAccount(String类Account中字段正确的是哪项 Accountf) Stringname=l.0；doubleamount="Mike";) Stringname;double) name="Mike,,, )类Account中方法正确的是哪一项 Accountf) voiddeposit()；} voiddeposit(){))classAccountf )下列有关类的代码片段，哪一项是正确的packageschool; java.sql.*；classStudent{}importjava．sql.*；packageschool; Student)packageschool;classStudent{} java.packageschool;importjava.sql.*；privateStringname;classStudent{}有关newnewnewnewnew所创建的对象一定存在变下列哪些是方法 add(inta)的重载方法？（选三项 add(long add(intpublicvoidadd(long add(float

我们定义一个Account Stringname;／／账户Stringamount; Account(String voiddepositdouble )voidwithdrawdouble }) Stringname;／／账户doujole Account(double voiddepositdouble )voidwithdrawdouble )) Stringname;／／账户double Account(String voiddepositdoublemount){)voidwithdrawdouble ))classAccountfStringname;／／账户doubleamount;／／金额Account(Stringname){ voiddeposit(){／／存款)voidwithdraw(){))class staticint'publicstaticvoidmain intBanana2b=new voidgo(int System.out.println}} classTestFoointString String {return voidsetX int} )FDirectionDirectioninta-Direction.NORTH;nDirectiondirection=2；packageutils;publicclassRep{publicstaticStringtwice(Strings){returns+s}l.//insertcodepublicclasspublicstaticvoidmain System.out.println(twice(" importimportimportstaticstaticimport privateintX-2；staticint voidmethod(){finalinti=100;intj classCinner{publicvoid}}}}在Here处可以的变量是哪些？（选三项 现有如F|一一 |一一 |一一 |一一||l-- class Alphaa；Betab; packagepackageimportimport两项

2packagepublicclasspublicstaticvoid classpublicstaticvoid //insertcode} Find3行将编译并产生输出“doX”？（B．X．doX()；D.x.XmyX=new710 1213AB1415CD．便于publicclasspublicvoidchange(int)publicclassChildextends／／覆盖父类change}下列哪个是正确的覆盖了父类的change方法protectedvoidchange(intpublicvoidchange(int intpublicvoidchange(intpublicvoidchange(String

为了使得System.out.println()输出对象的时候得到有意义的信我们应该覆盖Objectt{-的哪个方法？publicclasspublicclassCatextendsCatc-newCat()；Petp= Petp=(Pet)cPetp=(Pet)cPetp=Pet)cpublicclassPet{publicvoidspeak(){ystem.out.rt（"pt"}}publicclassCatextendsPet{pulolicvoid }}publicclassDogextendsPet( }} {newCat(),newDog(),nexPet()};for(inti=O;i<p.length;i++)p[i]B.CatCatC.CatDogD.CatDogclass classHarrierextendsDog class staticvoidmain Dogdl=newHarrierhl=newDogHarrier (Harrier)Harrier A.2DogB.2HarrierC.3Harrierclass Cat(int {System.out.print{"cat"+c+" classSubCatextends SubCat(intc){super(5);System.out.print this publicstaticvoidmain SubCats=new cat5cableclassGuy{String {return classCowboyextendsGuy Stringgreet() classSurferextendsGuy (Stringgreet() (return"dude!";} class publicstaticvoidmain guys (newGuy(),newCowboy(),new for(Guyg：guys)9.System.out.print(g.greet()};} hihowdyc7D8class intdolt(long return classUnderextends ／／insertcode7．shortdolt(int return intdolt(longXrlongy) return4; privateintdolt(shorty) return4; protectedintdolt(longx) return4; 6行，有几个可以通过编译？ 12classBeverageBeverage System.out.print("beverage classBeerextendsBeveragepublicstaticvoidmain{string[]args)Beerb=newBeer(14) publicintBeer(intx)this()System.out.print("beerl") publicBeer(){System.out.print("beer2");13.结果是什么beerlbeer2beveragebeer2beerl现有classBirdvoidtalk(){System.out.print("chirp"); classParrot2extendsBirdprotectedvoidtalk(){ opublicstaticvoidmain(String[]args)Bird[]birds={newBird(),newParrot2()for(Birdb:b.talk() 结果是什么chirpo classSuperFoodoStuff(int returnnew classFooextends ／／insertcode 和四个FoodoStuff(int returnnew FoodoStuff(intx) returnnewSuperFoo()； SuperFoodoStuff(intx) returnnewFoo(); SuperFoodoStuff(inty) returnnewSuperFoo(); 8 D．class ／／tectedHorseRadish(intx) 4.System.out.println("bokchoy"); classWasabiextends publicstaticvoidmain Wasabiw-newWasabi(); bokchoy（两项protected {thisprotected ／／justa newHorseRadish.ADDCDB．抽象类的必须包含 下列有关抽象方法叙述正确的是哪项？（选两项asbtractinterfaceC{intpublicinterfaceAimplements publicinterface {int interface 55interface void //insertcodeherepublicclassHouseCatimplements publicvoid 9．和以下三个接口interfaceFelineextends interfaceFelineextends{void}interfaceFelineextends{void{ 5 interfaceColor interface //insertcode和以下足六个classBoatextendsColor,extendsWeight classBoatextendsColorandWeight classBoatextendsColor,Weight classBoatimplementsColor, implementsWeight classBoatimplementsColorandWeight classBoatimplementsColor, 3 77class String publicclassBlueextends ／／insertcode 和四个publicStringgetRGB(){return"blue";}StringgetRGB(){return"blue";)privateStringgetRGB(){return"blue";}protectedStringgetRGB(){return"blue";)6行，有几个可以通过编译？ 8class //insertcode publicclassBlue2extends String 7．和4个 StringgetRGB()；StringgetRGB(); String String2O12D399class staticintpublic }classMiddleextends publicstaticvoid Middlem=newMiddle();9.System.out.println(x)j 234packagepublicclass publicstaticvoid {System.out.print importclass publiCstaticvoidmain XmyX=new x.XmyX2=new myx2 9．Find4Find5Find6doXdoXdoX

现有classTreeprivatestaticStringtree="treeStringgetTree return classElmextendsTreeprivatestaticStringtree="elmpublicstaticvoidmain newElm().go(new voidgo(Tree s t.getTree() Elm().getTree())System.out.println(s)结果为

elmelmelmtreeelmelmtreeelmelmtreeelmtree现有interfaceAnimalvoideat()3.//insertcodeherepublicclassHouseCatextendsFelinepublicvoideat(){9.classFelineimplementsAnimal{ voideat(); classFelineimplementsAnimal{publicvoideat();}classFelineimplementsAnimal{publicvoideat(){} classFelineimplementsAnimal{ publicvoideat();}A.B.C. 131.interface voidgo(); classAimplementsI{}classCextends void 136interfaceData{publicvoidclassInfo voidData和InfopublicclassEmployeeimplementsInfoextendsData publicvoidload() {／*dosomething*／))publicclassEmployeeextendsInf.implementsData{publicvoidload() {／*dosomething*／}}c.publicclassEmpl.yeeimplementsInfextendsData{publicvoidData.1oad() {*dosomething*／}publicvoidload(){／*do)D.publicclassEmployeeextendsInfimplementsData publicvoidData.1oad() {／*dosomething*／)publicvoidinfo.1oad(){/*do)下列代码正确的是哪项publicclassSessionimplementsRunnable,Clonable{publicvoidrun();publicObjectclone()}publicclassSessionextendsRunnable,Cloneable{publicvoidrun(){/*dosomething*/}publicObjectclone(){/*makea} classSessionimplementsRunnable,Clonable{pu)olicvoidrun(){/*dosomething*/}publicObjectclone(){/*makeacopy*/}}publicclassimplementsRunnable,implementsClonable{publicvoidrun(){/*dosomething*/}publicObjectclone(){/*makea}10 12131415A．父类的指向子类的实例是一种多态B.子类的指向子类的实例是一种多态c．接口的指向实现该接口类的实例是一种多态D．抽象类的指向抽象类的实例是一种多态Java中方法绑定有哪些形式？（选两项表达式"o"instanceofString返回的值是哪项10求平方根方法publicstaticdoublesqrtdoublea)可以传递的参数涉及类MyClass的方法签名足public a，该方法可接收的实际参数的类型可以是哪些？（选两项MyClassMyClassObjectclass publicvoidwrite(Stringcontent){System.out.println("Write"+content);}}classRubberPencilextendsPencil{publicvoiderase(Stringcontent){System.out.println("Erase"+content);}}Pencilpen=newRubberPencil();pen.write("o")；pen.erase("Write class publicvoidwrite(Stringcontent){System.out.println("Write"+content)；}}classRubberPencilextendsPencil{publicvoidwrite(Stringcontent){System.out.println("Rubber}publicvoiderase(Stringcontent){System.out.println("Erase"+content);}}Pencilpen=newRubberPencil()； RubberWrite 下列哪些方法是在编译时刻绑定的？（选三项privatefinalprivateclassPencil publicvoidwrite(Stringcontent){System.out.println("Write",+content){}}classRubberPencilextendsPencil{publicvoidwrite(Stringcontent){System.out.println("Rubber}publicvoiderase(Stringcontent){System.out.println("Erase"+content);}} ((RubberPencil)pen).write("WriteRubberWriteo11．现有：classTestA publicvoid }publicclassTestBextends publicvoidstart() publicstaticv.idmain(string[] }}class {publicStringclassBextendsA{publicStringAa=newB()；aInterfaceclassAimplementsclassBextendsclassCextendspublicstaticvoid Bb=new／／inSertC0de}}7java.lang.ClassCaseExceptionAF F B class String return classCowboyextendsGuy Stringgreet() "orch!";}}class staticvoidmain Guyg=newGuyg2=newWranglerw2=newSystem.out.print(g.greet()+g2.greet()+w2} A.hihiB. Chihowdyouch!classClassA{}classClassBextendsClassA{)classClassCextendsClassA{)ClassAp0=newClassA();ClassBpl=newClassB()；ClassCp2=newClassC()；ClassAp3=newClassB()；ClassAp4=new B．p1=p2;D．p2=E．p1=F．p2 DBAB语言中异常的分类是哪项？A．运行时异常和异常B．受检异常和非受检异常C．错误和异常D．错误和try...catch...finally结构，描述正确的是哪项？（选两项个有lly？B.C.NullPointerException

A.raiseB.thrownewC.throwD.throws的中，要求该方法必须抛出异常时使用哪个关键字classpublicstaticvoid System.out.print(Integer.parselnt}catch(RuntimeException System.out.print} (NumberFormatException 11．fortynumbervoid (Exception 1 15．1 void throws 1 system.out.print("late19．2.void throws thrownew}topGo(),则结果为A.lateB.C.latemiddleD.catchIateclassCalcpublicstaticvoidmain(String[]args)tryintx=Integer.parselnt("42a")//insertcodeSystem.out.print}}9."oops"选两项}catch(IllegalArgumentExceptione)}catch(IllegalStateExceptionc)}catch(NumbelFormatExceptionn)}catch(ClassCastExceptionc)现有classFlowpublicstaticvoidmain(String[]args)try4 System.out.print("before")5 doRiskyThing( System.out.print("after")}catch(Exceptionfe)System.out.print("catch") 10 System.out.println("done") publicstaticvoiddoRiskyThing()throws//thiscodereturnsunlessitthrowsan可能会产生哪两项结果?（选两项beforebeforeafterbeforecatchbeforeafter现有classBirdspublicstaticvoidmain trythrownewException()}catch(Exceptione)trythrownewException() (Exceptione2) System.out.print("inner");}System.out.print("middle") System.out.print("outer") 13.innermiddleinnermiddleouterD.编译失败 Parser publicstaticvoidmain System.out.print Parser().getlnt("42")) catch(NumberFormatExceptionn)5 System.out.println("NFExc") intgetlnt(String throwsreturnInteger.parselnt(arg) 10.classUtilsintgetlnt(String return 13.绐果为classParserextends publicstaticvoidmain(String[] 3.try{System.out.print(newParser().getlnt("42"));}catch(Exceptione) intgetlnt(Stringarg)throws returnInteger.parselnt class intgetlnt(String {return }class pulolicstaticvoidmain(String[]args)／／addcode newPropeller2().topGo(); void ／／addcode middleGo()；}void ／／addcode System.out.println("latemiddle"); voidgo() ／／addcodehere?{thrownew 为使代码通过编译，需要在哪一行加入throws811581125811classParserextendsUtilspublicstaticvoidmain System.out.print(newParser().getlnt catch(Exceptione)System.out.println("Exc") intgetlnt(String throws returnInteger.parselnt(arg) 10.classUtilsintgetlnt return 13.ABCBDDCACPUB．CPu执行的代码创建线程的时候必须实现哪项接口runf)A.Thread 6．为了保证方法的线程安全，方法的时候必须用哪个修饰符B.C.D. classThread2implements voidrun() 3.System.out.print("go¨); publicstaticvoid Thread2t2=newThreadt=new} 程序员想要创建一个名为MyThread的类以便在mainThreadMyThread必须继承Thread。MyThread必须实现ThreadMyThread必须覆盖publicvoidrun() D．classThreadBothextendsThreaaimplementsRunnable 3.publicvoid publicstaticvoiclmain Threadtl=newThreadt2=newThread} A.hiB.hi

现有：t是一个合法的Thread对象的，并且t的合法run()publicvoid System.out.print} gogogogogogo1212

classThreadExceptimplements publicvoid thrownewpublicstaticvoid Thread intx=Integer.parselnt(argsThread.sleep}catch(Exception }}和命令行：javaThreadExceptCmainjava.lang.RuntimeException:exceptionclassOrder2implements publicvoid for(intx-o; (Exceptione) publicstaticvoid Threadt=newThread(newfor(int x<4； ／／insertcode 15行，最有可能产生输出 (Exception 1414 classWaitingimplements boolean synchronizedvoid 6.System.out.print("1"); this.wait()；) (Exceptione) 8.System.out.print("2")； System.out.printtry{Thread.sleep(2000);}catch(Exception System.out.print publicstaticvoidmain {Waitingw=newnewThread(w)newThread(w)} 以下哪两项是止确的？（选两项l334l23D1342classOrderimplementsRunnablepublicvoidrun try{Thread.sleep(2000) }catch(ExceptionSystem.out.print("in")publicstaticvoidmain(String[] Threadt=newThread(newOrder())t.start()System.out.print("pre")try{t.join() }catch(Exception {System.out.print("post")可产生哪两项结果?(选两项preinpreinpostinpreprepostACCEBA下列哪项是Java在输入流的read方法返回哪个值的时候表示结束01-为了从文本文件中逐行内容，应该使用哪个处理流对象D．以下关于File类的叙述，哪两项正确？（选两项A．Filejava．ioB．创建一个Filec．FileDFile删除Fileimport staticvoidmain StringS=Scannersc=newScanner 7.System.out.print(sc.next() +""); xxyyFfjavaio．File型实例的合法frjava.io.FileReader型实例的合法brjava.io.BufferedReader型实例的合法 String//insertcodeSystem.out.println}

36while( while( while( while( while( while( intxreader.read()；阅读器不是FileReader或者BufferedReader阅读器可以是FileReader或者BufferedReaderc．阅读器可以是FileReader类型，但不能是BufferedReader类型D．阅读器可以是BufferedReader类型，但不能是FileReader类型Strings="writealinetoaA．wPrintWriter类型，也可以足BufferedWriterB.wPrintWriter类型，也不可以足BufferedWriterC.w可以是BufferedWriter类型，但不可以是PrintWriterDw以是PrintWriter类型，但不可以是BufferedWriter-fjava.io.File实例的frjava.io.FileReader实例的 哪两个是合法的？（选两项Filef2=newFileFileReaderfr2=newFileReaderFileReaderfr2=newFileReaderfr2=newBufferedReader =newBufferedReaderBufferedReaderbr2=newBufferedReader-fjava.io．File实例的合法fwjava.io.FileWriter实例的合法bwjava.io.BufferedWriter实例的合法PrintWriterprtWtr=newPrintWriterPrintWriter = PrintWriter(PrintWriterprtWtr=newBufferWriterbufWtr=newBufferedWritr(f)； rrrF.BufferWriterbufWtr=newBufferedWriterimport staticvoidmain intintfloatZ-7 System.out.format（"-%4d-"，System.out.format（"-%4.ld-} - -1234---42--1234---42--12345--’1410.classCarimplementsSerializableclassFordextendsCar如果试图序列化一个Ford15classPetimplementsSerializableCollarc=new3.4.classCollarimplementsSerializable{5.collarPartcpl=newCollarPart("handle");6.CollarPartcp2=newCollarPart("clip");7．classCollarPartimplements如果Pet0D.E.121314 集合APISet实现了SetList接口的特点是哪项？下列哪些项是泛型的优点？（选两项）创建一个只能存放String的泛型ArrayListArrayList<int>al=newArrayList<String>al=newArrayListal=newArrayList<String>al=new staticvoidmain Listal=newArrayList()；System.out.println(al)；}}importclass staticListlist=newArrayList();publicstaticvoidmain list.add("a")；list.add("b");list.add(//insertcodeSystem.out.print}}9for tor tor()； for tor for(Object for(Object importclass publicstaticvoidmain(String ififif(t.addfor(String ：System.out.print onethreeonetwoonetwothreefouronethreetwo哪两个是同步的？（选两项list是一个合法的集合getCollection()返回一个合法集合的for(Object for(Object for(Object tori tor tor(); a-b-c-d-本具体类型允许空元素及基于索引的描述d；3描述b描述 3描述CC.3描述 4描述bD.4描述 2描述Cimportclass publicstaticvoidmain(String s=newTreeSet<String>();s.add(s.add(／／insertcodefor(Strings2: 9.System.out.print(s2+"");10． (SortedSet)s.tailSet(s.first()); (SortSet<String>)s.tailSet(s.first());7s2和s2和s2,s3和sl.s2.s3和importclass staticListlist-newArrayList():5.staticListgetList() returnlist; 7.publicstaticvoidmain(Strincj[] ／／insertcodeSystem.out.print} 9行插入哪一项将输出for(charo:for(Object for(Objecto:for(Objecto:for(Objecto:importjava.util.*;3.Class 4.publicstaticvoidmain(String[]args) ／／insertcodeherec.put("X",} 5行，哪三行允许代码编译？(选三项Mapc=newHashMapc=newHashMapc=newSortedMapc=newArrayListc=newMaDc=newBBBADBD下列有关SwingSwing是Java基础类(JFC)Swing是可用来构建GUISwingAWT图形TJava基础类(JFC)SwingSwingGUI通常由哪几类元素组成？（选三项GUIB．GUI组件D．GUI侦以下关于Swing容器叙述，哪项错误？B．容器是组成GUI所必需的元素以下关于BorderLayout它可以对GUIjava.awtJTextField类提供的GUIGUI 当执行关闭窗口操作时，调用WindowsListener对象并将隐藏

当执行关闭窗口操作时，调用WincowsListener下列哪些是Swing容器的顶层容器？（选两项界面设计中我们希望实现一个框，该框上有5个垂直方向 框改变 框应该选择哪B.BorderLayoutD.null(no组件的setSiz