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选择题 1: 1. Whatistheresultwhenyoucompileandrunthefollowingcode? 2. 3. publicclassTest 4. 5. 6. 7. publicvoidmethod() 8. 9. 10. 11. for(inti=0;i3;i+) 12. 13. 14. 15. System.out.print(i); 16. 17. 18. 19. System.out.print(i); 20. 21. 22. 23. 24. 25. Choices:What is the result when you compile and run the following code? public class Test public void method()for(int i = 0; i ” and “”. Which statement is true? A.1010 0000 0000 0000 0000 0000 0000 0000 4 give 0000 1010 0000 0000 0000 0000 0000 0000 B.1010 0000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 0000 0000 0000 0000 0000 C.1010 0000 0000 0000 0000 0000 0000 0000 4 give 0000 0000 0000 0000 0000 0000 0000 0000 D.1010 0000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 0000 0000 0000 0000 0000 9:A class design requires that a member variable should be accessible only by same package, which modifer word should be used? A.protected B.public C.no modifer D.private 10: 1. publicclassOuterClass 2. privatedoubled1=1.0; 3. /insertcodehere 4. 5. Youneedtoinsertaninnerclassdeclarationatline3.Whichtwoinnerclassdeclarationsare 6. 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() return 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; 11: 1. publicclassX 2. 3. publicObjectm() 4. 5. Objecto=newFloat(3.14F);/line3 6. 7. Objectoa=newObject1;/line4 8. 9. oa0=o;/line5 10. 11. o=null;/line6 12. 13. returnoa0;/line7 14. 15. 16. 17. 18. WhenistheFloatobject,createdinline3,eligibleforgarbagecollection?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 collection?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 12:Which statements about Java code security are not true? A.The bytecode verifier loads all classes needed for the execution of a program. B.Executing code is performed by the runtime interpreter. C.At runtime the bytecodes are loaded, checked and run in an interpreter. D.The class loader adds security by separating the namespaces for the classes of the local file system from those imported from network sources. 13:使用 JDBC 可以做到的是 A.把二进制代码传送到任何关系数据库中 B.把 Java 源代码传送到任何关系数据库中 C.把表单信息传送到任何关系数据库中 D.很容易地把 SQL 语句传送到任何关系数据库中 14: 1. Givethefollowingcode: 2. publicclassExample 3. publicstaticvoidmain(Stringargs) 4. intl=0; 5. do 6. System.out.println(“Doingitforlis:”+l); 7. while(-l0) 8. System.out.println(“Finish”); 9. 10. 11. Whichwellbeoutput:Give the following code:public class Examplepublic static void main(String args )int l=0;doSystem.out.println(“Doing it for l is:”+l);while(-l0)System.out.println(“Finish”);Which well be output: A.Doing it for l is 3 B.Doing it for l is 1 C.Doing it for l is 2 D.Doing it for l is 0 15: 1. Whatwillhappenwhenyouattempttocompileandrunthefollowingcode? 2. 3. intOutput=10; 4. 5. booleanb1=false; 6. 7. if(b1=true)&(Output+=10)=20) 8. 9. 10. 11. System.out.println(Weareequal+Output); 12. 13. 14. 15. else16. 17. 18. 19. System.out.println(Notequal!+Output); 20. 21. 22. 23. 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 System.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! 10. 16:设有变量说明语句int a=1,b=0; 则执行以下程序段的输出结果为（ ）。 switch (a) case 1: switch (b) case 0:printf(*0*);break; case 1:printf(*1*);break; case 2:printf(*2*);break; printf(n); A.*0* B.*0*2* C.*0*1*2* D.有语法错误 简答题 17:String是最基本的数据类型吗? 18:数组aN，存放了1至N-1个数，其中某个数重复一次。写一个函数，找出被重复的数字.时间复杂度必须为o（N）函数原型：int do_dup(int a,int N) 19:用 100 元钱买 100 支笔，其中钢笔 3 元 / 支，圆珠笔 2 元 / 支，铅笔 0.5 元 / 支，问钢笔、圆珠笔和铅笔可以各买多少支 ? 20:如何现实servlet的单线程模式? 21:有一个整数n,写一个函数f(n),返回0到n之间出现的1的个数。比如f(13)=6,现