个公司的笔试题北京富基融通科技

1、选择题1:Which statement about listener is true?A.Most component allow multiple listeners to be added.B.If multiple listener be add to a single component, the event only affected one listener.C.Component don?t allow multiple listeners to be add.D.none2:What is the result when you compile and run the fol

2、lowing code?public class ThrowsDemostatic void throwMethod()System.out.println("Inside throwMethod.");throw new IllegalAccessException("demo");public static void main(String args)trythrowMethod();catch (IllegalAccessException e)System.out.println("Caught " + e);Choices:

3、What is the result when you compile and run the following code?public class ThrowsDemostatic void throwMethod()System.out.println("Inside throwMethod.");throw new IllegalAccessException("demo");public static void main(String args)trythrowMethod();catch (IllegalAccessException e)S

4、ystem.out.println("Caught " + e);Choices:A.Compilation errorB.Runtime errorC.Compile successfully, nothing is printed.D.Inside throwMethod. followed by caught:java.lang.IllegalAccessExcption: demo3: Consider the class hierarchy shown below:class FourWheeler implements DrivingUtilitiesclass

5、 Car extends FourWheelerclass Truck extends FourWheelerclass Bus extends FourWheelerclass Crane extends FourWheelerConsider the following code below:1.DrivingUtilities du;2.FourWheeler fw;3.Truck myTruck = new Truck();4.du = (DrivingUtilities)myTruck;5.fw = new Crane();6.fw = du;Which of the stateme

6、nts below are true?Choices:A.Line 4 will not compile because an interface cannot refer to an object.B.The code will compile and run.C.The code will not compile without an explicit cast at line 6, because going down thehierarchy without casting is not allowed.D.The code will compile if we put an expl

7、icit cast at line 6 but will throw an exception atruntime.4:给出下面的代码片断。下面的哪些陈述为错误的?1) public void create() 2) Vector myVect;3) myVect = new Vector(); 4) 给出下面的代码片断。下面的哪些陈述为错误的?1) public void create() 2)3)4) Vector myVect;myVect = new Vector();A.第二行的为变量 myVect 分配内存空间。B.第二行语句创建一个 Vector 类对象。C.第三行语句创建一个

8、Vector 类对象。D.第三行语句为一个 Vector 类对象分配内存空间5:鉴于 Java 的特点，它最适合的计算环境是A.并行计算环境B.分布式计算环境C.高强度计算环境D.开放式计算环境6:Give the following java class: public class Examplepublic static void main(String args) static int x = new int15; System.out.println(x5);Which statement is corrected? Give the following java class: pub

9、lic class Examplepublic static void main(String args) static int x = new int15; System.out.println(x5);Which statement is corrected?A.When compile, some error will occur.B.When run, some error will occur.C.Output is zero.D.Output is null.7:Give the following java class: public class Examplestatic in

10、t x=new int15;public static void main(String args) System.out.println(x5);Which statement is corrected? Give the following java class: public class Examplestatic int x=new int15;public static void main(String args) System.out.println(x5);Which statement is corrected?A.When compile, some error will o

11、ccur.B.When run, some error will occur.C.Output is zero.D.Output is null.8:What will happen when you attempt to compile and run the following code?public class Staticstaticint x = 5;static int x,y;public static void main(String args)x-;myMethod();System.out.println(x + y + +x);public static void myM

12、ethod()y = x+ + +x;Choices:What will happen when you attempt to compile and run the following code?public class Staticstaticint x = 5;static int x,y;public static void main(String args)x-;myMethod();System.out.println(x + y + +x);public static void myMethod()y = x+ + +x;Choices:A.prints : 2B.prints

13、: 3C.prints : 7D.prints : 89:软件生命周期的瀑布模型把软件项目分为 3 个阶段、8 个子阶段，以下哪一个是正常的开发顺序?A.计划阶段、开发阶段、运行阶段B.设计阶段、开发阶段、编码阶段C.设计阶段、编码阶段、维护阶段D.计划阶段、编码阶段、测试阶段10:Given the following class definition:class A protected int i; A(int i) this.i=i;which of the following would be a valid inner class for this class? Select val

14、id answer:Given the following class definition:class A protected int i; A(int i) this.i=i;which of the following would be a valid inner class for this class? Select valid answer:A.class B B.class B extends A C.class B extends A B()System.out.println(“i=”+i); D.class B class A 11:Which is the most ap

15、propriate code snippet that can be inserted at line 18 in the following code?(Assume that the code is compiled and run with assertions enabled)1.import java.util.*;2.3.public class AssertTest4.5.private HashMap cctld;6.7.public AssertTest()8.9.cctld = new HashMap();10.cctld.put("in", "

16、;India");11.cctld.put("uk", "United Kingdom");12.cctld.put("au", "Australia");13./ more code.14.15./ other methods .16.public String getCountry(String countryCode)17.18./ What should be inserted here?19.String country = (String)cctld.get(countryCode);20.r

17、eturn country;21.22. Which is the most appropriate code snippet that can be inserted at line 18 in the following code?(Assume that the code is compiled and run with assertions enabled)1.import java.util.*;2.3.public class AssertTest4.5.private HashMap cctld;6.7.public AssertTest()8.9.cctld = new Has

18、hMap();10.cctld.put("in", "India");11.cctld.put("uk", "United Kingdom");12.cctld.put("au", "Australia");13./ more code.14.15./ other methods .16.public String getCountry(String countryCode)17.18./ What should be inserted here?19.String coun

19、try = (String)cctld.get(countryCode);20.return country;21.22. A.assert countryCode != null;B.assert countryCode != null : "Country code can not be null" ;C.assert cctld != null : "No country code data is available"D.assert cctld : "No country code data is available"12:T

20、he following code is entire contents of a file called Example.java,causes precisely one error durin g compilation:class SubClass extends BaseClassclass BaseClass() String str;public BaseClass() System.out.println(“ok”); public BaseClass(String s) str=s;public class Example public void method()SubCla

21、ss s=new SubClass(“hello”); BaseClass b=new BaseClass(“world”);Which line would be cause the error?The following code is entire contents of a file called Example.java,causes precisely one error during compilation:class SubClass extends BaseClassclass BaseClass() String str;public BaseClass() System.

22、out.println(“ok”); public BaseClass(String s) str=s;public class Examplepublic void method()SubClass s=new SubClass(“hello”); BaseClass b=new BaseClass(“world”);Which line would be cause the error?A.9B.10C.11D.1213:在软件生命周期中，下列哪个说法是确的?A.软件生命周期分为计划、开发和运行三个阶段B.在计划阶段要进行问题焉醛和需求分析C.在开发后期要进行编写代码和软件测试D.在运行阶段主要是进行软件维护14:Which of the following statements are not legal?A.long l = 4990;B.int i = 4L;C.double d = 34.4;D.double t = 0.9F.15:Select valid identifier of Java: Select valid identifier