2-java笔试题.doc

JAVA笔试题（一）（60分钟）一、不定项选择题（3分*20=60分）1、Whichdeclarationsofidentifiersarelegal?A.$persons B.TwoUsers C.*point D.this E._endline2、WhicharenotJavakeywords?A.TRUE B.sizeof C.const D.super E.void3、WhicharenotJavaprimitivetypes?A.short B.Boolean C.unit D.float 4、what is the return type of Java specified execution method main（）？A.int B.void C.Boolean D.static5、Whichofthefollowingfragmentsmightcauseerrors?A.Strings=Gonewiththewind; B.Strings=Gonewiththewind;Stringt=good; Stringt;Stringk=s+t; t=s3+one;C.Strings=Gonewiththewind; D.Strings=homedirectory;Stringstandard=s.toUpperCase(); Stringt=s-directory.6、Whichlayoutmanagerisused whentheframeisresizedthebuttonsspositionintheFramemightbechanged?A.BorderLayout B.FlowLayout C.CardLayout D.GridLayout7、WhichwilldisplayifoneMethodrunnormally?publicvoidtest()tryoneMethod();System.out.println(condition1);catch(ArrayIndexOutOfBoundsExceptione)System.out.println(condition2);catch(Exceptione)System.out.println(condition3);finallySystem.out.println(finally);A.condition1 B.condition2 C.condition3 D.finally8、Which three are equivalent to line 2?public interface Fooint k = 4;A.final int k = 4 B.public int k = 4 C.static int k = 4D.private int k = 4 E.abstract int k = 4 F.volatile int k = 4G.transient int k = 4 H.protected int k = 49、What is the result?interface Foo int k=0; public class Test implements Foo public static void main(String args) int i; Test test =new Test(); i=test.k; i=Test.k; i=Foo.k; A. Compilation succeeds B. An error at line 2 causes compilation to failC. An error at line 9 causes compilation to fail D. An error at line 10 causes compilation to failE. An error at line 11 causes compilation to fail10、Whichstatementsaboutthreadaretrue?A.Onceathreadiscreated,itcanstarrunningimmediately.B.Tousethestart()methodmakesathreadrunnable,butitdoesnotnecessarilystartimmediately.C.Whenathreadstopsrunningbecauseofpre-emptive,itisplacedatthefrontendoftherunnablequeue.D.Athreadmayceasetobereadyforavarietyofreasons.11、WhichisnotamethodoftheclassInputStream?A.intread(byte) B.voidflush() C.voidclose() D.intavailable()12、WhichclassescanbeusedastheargumentoftheconstructoroftheclassFileInputStream?A.InputStream B.File C.FileOutputStream D.String13、Whichexpressionsarecorrecttodeclareanarrayof10Stringobjects?A.charstr=newString10 B.charstr=newString10C.Stringstr=newString10 D.Stringstr10 =newString1014、which two interfaces provide the capability to store objects using a key-value pair? A. java.util.Map B. java.util.Set C. java.util.List D. java.util.SortedSet E. java.util.SortedMap F. java.util.Collection15、下面的描述错误的是 ( )A Statement的executeQuery()方法会返回一个结果集B Statement的executeUpdate()方法会返回是否更新成功的boolean值C 使用ResultSet中的getString()可以获得一个对应于数据库中char类型的值D ResultSet中的next()方法会使结果集中的下一行成为当前行16、Giventhefollowingcode:if(x0)System.out.println(first);elseif(x-3)System.out.println(second);elseSystem.out.println(third);Whichrangeofxvaluewouldprintthestringsecond?A.x0 B.x-3 C.x=-3 D.x-317、阅读下面程序：public class Main public static void main(String args)String s1=args1; String s2=args2;String s3=args3; String s4=args4;System.out.println(“args2=”+s2);编译后执行：java Main 1 2 3 4 结果是下面哪一个？A、args2=2B、args2=nullC、args2=1D、运行出现异常18、Giventhefollowingcode:publicclassTestvoidprintValue(intm)doSystem.out.println(Thevalueis+m);while(-m10)publicstaticvoidmain(Stringarg)inti=10;Testt=newTest();t.printValue(i);Whichwillbeoutput?A、Thevalueis8 B、Thevalueis9 C、Thevalueis10 D、Thevalueis1119、Whicharesyntacticallyvalidstatementat/pointx?classPersonprivateinta;publicintchange(intm)returnm;publicclassTeacherextendsPersonpublicintb;publicstaticvoidmain(Stringarg)Personp=newPerson();Teachert=newTeacher();inti;/pointxA.i=m B.i=b C.i=p.a D.i=p.change(30) E.i=t.b20、publicclassParentpublicintaddValue(inta,intb)ints;s=a+b;returns;classChildextendsParentWhichmethodscanbeaddedintoclassChild?A.intaddValue(inta,intb)/dosomething.B.publicvoidaddValue()/dosomething.C.publicintaddValue(inta)/dosomething.D.publicintaddValue(inta,intb)throwsMyException/dosomething.二、填空题（2分*10=20分）1、JSP的内置对象有_、config、_、_、_、_、_、_、exception。2、实现线程有两种用法,分别为：_和_。3、线程同步的方法有_、_、_、_。（请至少写出三个）4、String s = new String(xyz)这个语句创建了_个String Object。5、try里有一个return语句，那么紧跟在这个try后的finally里的code_（填写“会”或者 “不会”）被执行，在return_（填写“前” 或者“后”）执行。6、Error表示_；Exception表示_。7、在Jdbc中常用的接口有_、_、_、_。（请至少写出三个）8、Struts是一种应用广泛的MVC框架，MVC是一个设计模式，它强制性地使应用程序的输入、处理和输出分开。使用MVC应用程序被分成三个核心部件：_、_、_。9、在java中一个类被声明为final类型，表示_。10、数组_（填写“有” 或者“没有”）length()这个方法，_（填写“有” 或者“没有”）length的属性。三、程序分析题（10分*2=20分）1、classTestA publicTestA() a1(); publicvoida1()System.out.println(A-a1); publicclassTest