四川联宏信息技术开发有限公司.doc

选择题 1: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 2: 1. Givethisclassoutline: 2. classExample 3. privateintx; 4. /restofclassbody 5. 6. AssumingthatxinvokedbythecodejavaExample,whichstatementcanmadexbedirectlyaccessibleinmain()methodofExample.java?Give this class outline:class Exampleprivate int x;/rest of class bodyAssuming that x invoked by the code java Example, which statement can 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 3:Math.round(-11.5)等於多少? A.-11 B.-12 C.-11.5 D.none 4:Which statement about the garbage collection mechanism are true? A.Garbage collection require additional programe code in cases where multiple threads are running. B.The programmer can indicate that a reference through a local variable is no longer of interest. C.The programmer has a mechanism that explicity and immediately frees the memory used by Java objects. D.The garbage collection mechanism can free the memory used by Java Object at explection time. 5:public class Parent int change() class Child extends Parent Which methods can be added into class Child? A.public int change() B.abstract int chang() C.private int change() D.none 6: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. 7:关于垃圾收集的哪些叙述是对的。 A.程序开发者必须自己创建一个线程进行内存释放的工作。 B.垃圾收集将检查并释放不再使用的内存。 C.垃圾收集允许程序开发者明确指定并立即释放该内存。 D.垃圾收集能够在期望的时间释放被java对象使用的内存。 8:以下的C程序代码片段运行后C和d的值分别是多少 Int a =1,b =2; Int c,d; c =(a&b)&a; d =(a&b)&a; A.0,0 B.0,1 C.1,0 D.1,1 9: 1. Givethefollowingjavasourcefragement: 2. /pointx 3. publicclassInteresting 4. /dosomething 5. 6. WhichstatementiscorrectlyJavasyntaxatpointx?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 other thing B.static int PI=3.14 C.class MyClass/do something D.none 10:Which of the following answer is correct to express the value 8 in octal number? A.010 B.0x10 C.08 D.0x8 11:Which is the main() method return of a application? A.String B.byte C.char D.void 12: 1. 给出下面的代码片断。下面的哪些陈述为错误的? 2. 1)publicvoidcreate() 3. 2)VectormyVect; 4. 3)myVect=newVector(); 5. 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) 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 13:What is written to the standard output given the following statement:System.out.println(4|7); Select the right answer: A.4 B.5 C.6 D.7 14: 1. Whatresultsfromattemptingtocompileandrunthefollowingcode? 2. 3. publicclassTernary 4. 5. 6. 7. publicstaticvoidmain(Stringargs) 8. 9. 10. 11. inta=5; 12. 13. System.out.println(Valueis-+(a5)?9.9:9); 14. 15. 16. 17. 18. 19. Choices:What results from attempting to compile and run the following code? public class Ternarypublic static void main(String args)int a = 5;System.out.println(Value is - + (a 5) ? 9.9 : 9); Choices:A.prints: Value is - 9 B.Compilation error C. prints: Value is - 5 D.None of these 15: 1. Givethefollowingjavaclass: 2. publicclassExample 3. publicstaticvoidmain(Stringargs) 4. staticintx=newint15; 5. System.out.println(x5); 6. 7. 8. Whichstatementiscorrected?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?A.When compile, some error will occur. B.When run, some error will occur. C.Output is zero. D.Output is null. 简答题 16:你所知道的集合类都有哪些？主要方法？ 17: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,现在f(1)=1,问下一个最大的f(n)=n的n是什么？ 18:How to use final to class,method and data? 19:有一篇英文文章(也就是说每个单词之间由空格分隔)，请找出“csdn”着个单词出现的次数，要求效率最高，并写出算法的时间级。 20:马克思在数学手稿中提出如下问题：有30个人(包括男人、女人和小孩)在一家饭店吃饭共花50先令，其中每个男人花3先令，每个女人花2先令，每个小孩花1先令，问男人、女人、小孩各有多少人? 21:在使用spring开发的J2EE分层结构中,service层一般都有XXXManager接口，请问他的作用是？ 22:在一个正整数序列中求和最大的非相邻子序列（序列任两元素在原序列里都不相邻） 23:Hashtable和HashMap的异同。 24:servlet的生命周期? 25:公元4046年，人类科学高度发达，绝大部分人都已经移居至浩瀚的宇宙，在上千颗可居住的星球上留下了人类的印记。然而，此时人类却分裂成了两个联盟：正义联盟和邪恶联盟。两个联盟之间仇恨难解，时有战争。 现在，邪恶联盟通过不正当贸易积聚了大量宇宙财富。因此，正义联盟计划要破坏邪恶联盟的非法贸易网络，从而影响邪恶联盟的经济状况，为下