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1、选择题 1: 1. What is the result when you compile and run the following code? 2. 2. public class Test 4. 3. 6. 4. public void method。 8. 5. 10. 6. for(int i = 0; i ” and“ ” . Which statement is true? .1010 0000 0000 0000 0000 0000 0000 0000 4 give 0000 1010 0000 0000 0000 0000 0000 0000 .1010 0000 0000

2、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 B.public C. no modifer .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 v

3、ariable should be accessible only by same package, which modifer word should be used? Io-1 A. protected D.private 10: 1. public class OuterClass 2. private double d1 =1.0; 3. /insert code here 4. 5. You need to insert an inner class declaration at line3. Which two inner class declarati ons are 6. va

4、lid? A. class lnnerOne public static double methoda() retur n d1; r B. public class lnnerOne static double methoda() retur n d1; r C. private class lnnerOne double methoda() retur n d1; r D. static class lnnerOne protected double methoda() retur n d1; 11: 1. public class X 2. 2. public Object m() 4.

5、 3. Object o = new Float( 3.14F);/l ine 3 6. 4. Object oa = new Object 1;/li ne 4 8. 5. oa 0 = o;/line 5 10. 11.o=null;/line 6 12. 13. 14. return oa O;/line 7 15. 16. 16. 17. When is the Float object, created in line3,eligible for garbage collection? A.just after line 5. B. just after line 6 C. just

6、 after line 7(that is,as the method retur ns) .n ever 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. .Executi ng code is performed by the run time in terpreter. C.At run time the bytecodes ar

7、e loaded, checked and run in an in terpreter. D. The class loader adds security by separating the namespaces for the classes of the local file system from those imported from n etwork 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 .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 14: .很容易地把 SQL语句传送到任何关系数据库中 1.

8、Give the following code: 2. public class Example 3. public static void main(String args ) 4. int l= 0; 5. do 6. System.out.println(“ Doitifipr l is: ” +l); 7. while(-l 0) 8. System.out.println(“ Finish ” ); 9. 10. 11. Which well be output: A.Doing it for l is 3 B. Doing it for l is 1 C. Doing it for

9、 l is 2 .Doing it for l is 0 15: 1. What will happen when you attempt to compile and run the following code? 2. 2. int Output =10; 4. 3. boolean b1 = false; 6. 4. if(b1 = true) 12. 7. 14. 8. else 16. 9. 18. 10. System.out.pri ntln( Not equal! + Output); 20. 21. 22. 23. Choices: A.Compilati on error,

10、 attempt ing to perform bi nary comparis on 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岀结果为()。 switch (a) case 1: switch (b) case 0:prin tf(*0*);break; ca

11、se 1:pri ntf(*1*);break; case 2:printf(*2*);break; pri ntf(n); *0* r I 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，找岀被重复的数字. 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之间岀现的1的个数。比如f(13)=6,现在f(1)=1, 问下一个最大的f(n)=n的n是什么？ 22:自己随意构造一个用户类(UserRecor