武汉智远软件有限责任公司

1、选择题 1: What will be the result of executing the following code?      / Filename; SuperclassX.java     package packageX;      public class SuperclassX  

2、0;       protected void superclassMethodX()               int superclassVarX;                 / Filename SubclassY.

3、java     1.package packageX.packageY;     2.     3.public class SubclassY extends SuperclassX     4.     5.SuperclassX objX = new SubclassY();   

4、  6.SubclassY objY = new SubclassY();     7.void subclassMethodY()     8.     9.objY.superclassMethodX();     10.int i;     11.i = objY.superclassVarX

5、;     12.     13.      Choices:  What will be the result of executing the following code? / Filename; SuperclassX.javapackage packageX; public class SuperclassXprotected void superclassMethodX()int superclassVarX; / Filename

6、SubclassY.java1.package packageX.packageY;2.3.public class SubclassY extends SuperclassX4.5.SuperclassX objX = new SubclassY();6.SubclassY objY = new SubclassY();7.void subclassMethodY()8.9.objY.superclassMethodX();10.int i;11.i = objY.superclassVarX;12.13. Choices:A.Compilation error at line 5 B.Co

7、mpilation error at line 9 C.Runtime exception at line 11 D.None of these 2: The following code is entire contents of a file called Example.java,causes precisely one error during compilation:    class SubCl

8、ass extends BaseClass        class BaseClass()    String str;    public BaseClass()    System.out.println(“ok”);    public BaseClass(String s)    str=s;  &

9、#160; public class Example    public void method()    SubClass s=new SubClass(“hello”);    BaseClass b=new BaseClass(“world”);             Which line 

10、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 BaseClass class BaseClass() String str; public BaseClass() System.out.println(“ok”); public BaseCla

11、ss(String s) str=s; public class Example public void method() SubClass s=new SubClass(“hello”); BaseClass b=new BaseClass(“world”); Which line would be cause the error? A.9 B.10 C.11 D.12 3: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 4: What will be printed when&#

12、160;you execute the following code?      class X         Y b = new Y();     X()            System.out.print("X");&#

13、160;              class Y           Y()                System.out.print("Y");       

14、        public class Z extends X          Y y = new Y();      Z()             System.out.print("Z&qu

15、ot;);             public static void main(String args)                        new Z();     

16、;         Choices:  What will be printed when you execute the following code? class X Y b = new Y(); X() System.out.print("X"); class Y Y() System.out.print("Y"); public class Z extends X Y y = new Y(); Z() System.out.print("Z&quo

17、t;); public static void main(String args) new Z(); Choices:A.Z B.YZ C.XYZ D.YXYZ 5: Given the following class definition:   class A   protected int i;   A(int i)   this.i=i;         which

18、60;of the following would be a valid inner class for this class?   Select valid answer:   Given the following class definition:class Aprotected int i;A(int i)this.i=i;which of the following would be a valid inn

19、er 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 6: 下述程序代码中有语法错误的行是（  ）。   int i,ia10,ib10;      /*第一行*/  for (i=0;i<=9;i+) 

20、60;      /*第2行*/    iai=0;          /*第3行*/  ib=ia;    /*第4行*/  下述程序代码中有语法错误的行是（ ）。int i,ia10,ib10; /*第一行*/for (i=0;i<=9;i+) /*第2行*/ iai=0; /*第3行*/ib=ia; /*第

21、4行*/A.第1行 B.第2行 C.第3行 D.第4行 7: Give this class outline:   class Example   private int x;   /rest of class body      Assuming that x invoked by the code java Example,

22、 which statement can made x be directly accessible in main() method of Example.java?  Give this class outline:class Exampleprivate int x;/rest of class bodyAssuming that x invoked by the code java Example, which statement can

23、 made x be directly accessible in main() method of Example.java?A.Change private int x to public int x B.change private int x to static int x C.Change private int x to protected int x D.change private int x to final int x 8:假定a和b为int型变量,则执行下述语句组后,b的值为 a=1; b=10; do b-=a; a+; while (b-<0); A.9 B.-

24、2 C.-1 D.8 9: public class OuterClass    private double d1 = 1.0;   /insert code here      You need to insert an inner class declaration at line 3. Which t

25、wo inner class declarations are   valid?  public class OuterClass private double d1 = 1.0;/insert code hereYou need to insert an inner class declaration at line 3. Which two inner class declarations arevalid?A.class InnerOne public static double methoda() retu

26、rn d1; B.public class InnerOne static double methoda() return d1; C.private class InnerOne double methoda() return d1; D.static class InnerOne protected double methoda() return d1; 10:Which are not Java keywords? A.TRUE B.const C.super D.void 11:In the following pieces of code, which one will compil

27、e without any error? A.StringBuffer sb1 = "abcd" B.Boolean b = new Boolean("abcd"); C.C: byte b = 255; D.float fl = 1.2; 12: public class X        public Object m()           

28、Object o = new Float(3.14F);/line 3           Object  oa = new Object1;/line 4           oa0 = o;/line 5     &

29、#160;     o=null;/line 6           return oa0;/line 7                  When is the Float object, created 

30、in line 3,eligible for garbage collection?  public class X public Object m() Object o = new Float(3.14F);/line 3 Object oa = new Object1;/line 4 oa0 = o;/line 5 o=null;/line 6 return oa0;/line 7 When is the Float object, created in line 3,eligible for garbage colle

31、ction?A.just after line 5. B.just after line 6 C.just after line 7(that is,as the method returns) D.never in this method 13: Give the following java source fragement:   /point x   public class Interesting   /do something 

32、0;    Which statement is correctly Java syntax at point x?   Give the following java source fragement:/point xpublic class Interesting/do somethingWhich statement is correctly Java syntax at point x? A.public class MyClass/do othe

33、r thing B.static int PI=3.14 C.class MyClass/do something D.none 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: What will happen when you attempt to compile and run the

34、0;following code?      int Output = 10;     boolean b1 = false;      if(b1 = true) && (Output += 10) = 20)        

35、60;    System.out.println("We are equal " + Output);           else            System.out.println("Not equal! " + O

36、utput);           Choices:  What will happen when you attempt to compile and run the following code? int Output = 10;boolean b1 = false; if(b1 = true) && (Output += 10) = 20) System.out.println("We are equal " + Output); else S

37、ystem.out.println("Not equal! " + Output); Choices:A.Compilation error, attempting to perform binary comparison on logical data type B.Compilation and output of "We are equal 10". C.Compilation and output of "Not equal! 20". D.Compilation and output of "Not equal!

38、10". 16: What will be the result of executing the following code?     boolean a = true;    boolean b = false;    boolean c = true;    if

39、0;(a = true)    if (b = true)    if (c = true)    System.out.println("Some things are true in this world");    else      

40、0;System.out.println("Nothing is true in this world!");     else if (a && (b = c)  System.out.println("It's too confusing to tell what is true and&#

41、160;what is false");     else   System.out.println("Hey this won't compile");      Choices:  What will be the result of executing the following code? boolean a = true; boolean b = false;

42、 boolean c = true; if (a = true) if (b = true) if (c = true) System.out.println("Some things are true in this world"); else System.out.println("Nothing is true in this world!"); else if (a && (b = c) System.out.println("It's too confusing to tell what is true and

43、 what is false"); else System.out.println("Hey this won't compile"); Choices:A.The code won't compile B."Some things are true in this world" will be printed C."Hey this won't compile" will be printed D.None of these 17: 给出下面的代码片断。下面的哪些陈述为错误的?  

44、0;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) Vector myVect;3) myVect = new Vector()

45、;4) A.第二行的声明不会为变量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Vector类对象。 D.第三行语句为一个Vector类对象分配内存空间 18: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.Componen

46、t don?t allow multiple listeners to be add. D.none 19: Select valid identifier of Java:  Select valid identifier of Java:A.%passwd B.3d_game C.$charge D.this 20: Which is the most appropriate code snippet that can be ins

47、erted at line 18 in the following code?     (Assume that the code is compiled and run with assertions enabled)     1.  import java.util.*;    

48、60;2.      3.  public class AssertTest     4.       5.      private HashMap cctld;     6.          7

49、.      public AssertTest()     8.           9.          cctld = new HashMap();     10.    

50、     cctld.put("in", "India");     11.         cctld.put("uk", "United Kingdom");     12.       

51、0; cctld.put("au", "Australia");     13.         / more code.      14.          15.     / other

52、 methods .       16.     public String getCountry(String countryCode)     17.          18.         / What

53、 should be inserted here?     19.         String country = (String)cctld.get(countryCode);     20.         return country;  &

54、#160;  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

55、AssertTest4. 5. private HashMap cctld;6. 7. public AssertTest()8. 9. cctld = new HashMap();10. cctld.put("in", "India");11. cctld.put("uk", "United Kingdom");12. cctld.put("au", "Australia");13. / more code. 14. 15. / other methods . 16. pu

56、blic String getCountry(String countryCode)17. 18. / What should be inserted here?19. String country = (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 co

57、untry code data is available" D.assert cctld : "No country code data is available" 21: What is the result when you compile and run the following code?      public class Test           public void method()          for(int i = 0;